Stainless Steel High-Temp Ball Valve | DN15-300 1200°C Metal Seal Factory

A Stainless Steel High-Temperature Ball Valve is a quarter-turn (90° rotation) on-off ball valve featuring a full stainless steel body in heat-resistant grades (304/316L/310S/2520) and advanced high-temperature sealing technology (elastic metal seal + all-metal hard seal, with soft PTFE/PEEK or hard tungsten carbide/Stellite options), engineered for reliable shut-off of high-temperature, high-pressure, corrosive, sulfide-bearing media in extreme industrial environments where ordinary carbon steel or standard stainless ball valves suffer seal failure, material embrittlement/softening, and frequent maintenance. The core highlight is the full stainless heat-resistant body + ultra-high temperature to 1200°C + metal hard seal zero leakage + NACE anti-sulfur + API 607 fire-safe combination: (a) Full stainless heat-resistant body: valve body and internal parts in 304 (general corrosion, ≤600°C), 316L (low-carbon, superior corrosion, NACE MR0175 anti-sulfur, ≤600°C), 310S (25Cr-20Ni austenitic heat-resistant stainless, excellent high-temp oxidation resistance, continuous service to ~1000°C, intermittent to ~1050°C), 2520 (also called 310S mod / 0Cr25Ni20, higher Cr/Ni, dual-phase heat-resistant, continuous service to ~1200°C, excellent creep and oxidation resistance) - selected by working temperature and medium; all stainless = no rust, no corrosion scaling, no iron contamination (critical for food/pharma/semiconductor), and high-temp strength retention; (b) Ultra-high temperature range: conventional model -40°C ~ 550°C (with PEEK/metal seal + graphite packing), special high-temperature coated model up to 1200°C (2520 body + all-metal hard seal + HVOF WC/Stellite coated ball + special high-temp packing) - covers steam, thermal oil, high-temp gas, furnace gas, cracking gas; materials maintain mechanical properties (no embrittlement at low temp, no softening at high temp) under long-term operation; (c) Innovative sealing: elastic metal seal (flexible metal seat ring that conforms to ball under pressure, compensates for thermal expansion mismatch) + all-metal hard seal (ball and seat precision lapped to 100% contact - metal-to-metal, no soft material to degrade at high temp); leakage rate <0.001% of ANSI standard (near-zero for metal seal); soft seal options PTFE (≤180°C) / PEEK (≤250°C) for lower-temp zero-leakage; hard seal options tungsten carbide (WC) / Stellite alloy (Co-Cr) for high-temp/abrasive; (d) High-performance ball: stainless steel (standard), Stellite 6 (cobalt-based hard alloy, HRC 40-45, high-temp/wear), or HVOF-sprayed WC coating (High Velocity Oxy-Fuel tungsten carbide, HRC 70+, extreme wear/abrasion, high-temp) - ball surface precision ground/lapped to match seat; (e) Nitrided blow-out proof stem: stem surface nitrided (case-hardened, high surface hardness, wear/galling resistant) + anti-blowout bottom-retained shoulder - smooth operation, long stem life, safe; (f) Anti-static + API 607 fire-safe: anti-static (metal-to-metal contact provides electrostatic channel - no additional device needed); API 607 fire-safe - flexible graphite packing + metal wound gasket maintain sealing for 30 minutes in fire (soft seats may degrade but metal backup + graphite contain), winning emergency response time; (g) Modular design + low maintenance: modular body/seat/stem 便于拆卸维护,maintenance cycle extended 50% vs ordinary valves (high-temp materials + metal seal = less wear, longer intervals), reducing downtime and cost; (h) Wide pressure: PN16–PN100 (Class 150–900), customizable up to 100MPa - from medium to ultra-high pressure; (i) Wide size: DN15–DN300 (1/2"–10"), customizable up to DN800; (j) Multiple connections: flange (ANSI B16.5, DIN 2543), thread (NPT, BSPT), butt weld (BW), socket weld (SW) - adaptable to different pipeline systems; (k) Multiple actuation: manual (handwheel/worm gear), pneumatic (fast response, ATEX explosion-proof), electric (4-20mA signal, explosion-proof optional, DCS/PLC remote); (l) Standards: API 6D, API 608, API 598, ASME B16.34, DIN 3357, ISO 5208; (m) Leakage: soft seal ≤0.1ppm, hard seal ≤ISO 5208 Class VI; (n) Applicable media: steam, thermal oil, high-temperature gas, corrosive chemicals, sulfide media; (o) Applications: petrochemical (catalytic cracking, ethylene cracking, hydrogenation reactors - 900°C+ cracking gas), power (supercritical thermal, nuclear - 620°C/25MPa steam), metallurgy (steel converter flue gas, non-ferrous smelting - 1200°C furnace gas), building materials (glass melting furnaces, ceramic kilns), pharmaceutical/food/aerospace (high-temp sterilization, fuel lines). Certified CE, ISO, API 607. This valve is the full-stainless high-temperature metal-seal ball valve solution for extreme high-temperature industrial pipelines.

The full stainless heat-resistant body (304/316L/310S/2520), ultra-high temperature to 1200°C, elastic metal + all-metal hard seal, NACE anti-sulfur, API 607 fire-safe, and modular low-maintenance design make this valve uniquely suited for extreme high-temperature, high-pressure, corrosive/sulfide-bearing industrial service - particularly in petrochemical cracking, supercritical/nuclear power, metallurgical furnace gas, and high-temperature kiln applications where ordinary valves fail rapidly. Compared to other ball valves in the series: (a) vs. Pneumatic High-Temperature Ball Valve: that one is pneumatic actuator + 2520/nickel-base alloy + five-stage seal + max 1200°C + thermal isolation bracket - for automated high-temp; this one is full stainless (304/316L/310S/2520) + multi-drive (manual/pneumatic/electric) + elastic metal seal + NACE anti-sulfur + API 607 - for high-temp with corrosion/sulfur/fire-safe, manual or automated; (b) vs. Electric High-Temperature Ball Valve: that one is electric actuator + O-type ball + PPL/hard alloy + max 800°C + IP65/Exd - for automated moderate high-temp; this one is higher temp 1200°C + full stainless heat-resistant + metal hard seal + NACE - for more extreme high-temp/corrosive; (c) vs. Integral Ball Valve: that one is one-piece body + long-distance pipeline + 30-year life + -196~350°C - for long transmission; this one is high-temp specialized + full stainless heat-resistant + metal seal + 1200°C - for extreme high-temp process (not long-distance general); (d) vs. Stainless Steel Electric Ball Valve: that one is general 304/316 + electric + -40~210°C - for general corrosion automation; this one is heat-resistant 310S/2520 + to 1200°C + metal hard seal + high-pressure - for extreme high-temp; (e) vs. Forged Steel Ball Valve: that one is forged carbon/alloy + small bore NPS≤4" + API 602 - for small high-pressure; this one is cast stainless heat-resistant + DN up to 300/800 + high-temp - for larger high-temp; (f) vs. Wide Flange Ball Valve: that one is wide flange + large DN + floating/trunnion + -196~350°C - for large general; this one is high-temp specialized + metal seal + 1200°C - for extreme temp. High-temperature material selection explained (core): (a) 304 (18Cr-8Ni): general corrosion, ≤600°C continuous (oxidation limits), low cost - for water/steam/oil/general chemical up to ~550°C; (b) 316L (16Cr-10Ni-2Mo, low carbon): superior corrosion (Mo adds pitting resistance), NACE MR0175 anti-sulfur (for H2S/sour service), ≤600°C - for corrosive chemical, oil/gas sour service, food/pharma; (c) 310S (25Cr-20Ni, low carbon): austenitic heat-resistant stainless, excellent high-temp oxidation resistance (high Cr/Ni form protective oxide scale), continuous service to ~1000°C, intermittent to ~1050°C, good creep strength - for furnace parts, heat treatment, high-temp gas, thermal cycling; (d) 2520 (0Cr25Ni20 / 310S mod): higher Cr/Ni than 310S, dual-phase heat-resistant, continuous service to ~1200°C, excellent oxidation and creep at extreme temp - for 1200°C furnace gas, kiln, cracking; (e) selection rule: choose by maximum continuous operating temperature - ≤550°C → 304/316L; 550-1000°C → 310S; 1000-1200°C → 2520; also consider corrosion (316L for sour/corrosive). High-temperature sealing explained: (a) Soft seal (PTFE/PEEK): for ≤250°C, zero leakage (bubble-tight), but degrades above temp - not for high-temp; (b) Elastic metal seal: flexible metal seat ring (e.g., stainless with spring/elastic structure) that conforms to ball under pressure, compensates for differential thermal expansion between ball and seat (critical at high temp where materials expand at different rates), provides metal-to-metal seal with some compliance - better than rigid metal seal; (c) All-metal hard seal: ball and seat both metal, precision lapped to 100% contact (matched spherical surfaces), no soft material - works at 1200°C, wear/abrasion resistant, fire-safe; leakage <0.001% ANSI (near-zero, but not bubble-tight like soft seal - metal seal has slight leakage per ISO 5208 Class VI/D); (d) Composite seal: metal seat with soft insert (e.g., graphite/PTFE in metal ring) - combines metal strength with soft seal zero leakage, for mid-temp; (e) seat materials for high-temp: Stellite 6 (Co-Cr, HRC 40-45, to ~800°C), tungsten carbide WC (HRC 70+, to ~1200°C, HVOF coated), 2520 stainless (to 1200°C); (f) packing for high-temp: flexible graphite (to ~650°C in oxidizing, higher in non-oxidizing), not PTFE (fails >180°C); (g) gasket for high-temp: metal wound (spiral-wound stainless+graphite), not PTFE. Ball coating explained: (a) Stellite 6: cobalt-based alloy, welded/overlay on ball, HRC 40-45, good high-temp hardness and wear, corrosion resistant - common for high-temp valves; (b) HVOF WC: High Velocity Oxy-Fuel sprayed tungsten carbide coating, very dense, HRC 70+, extreme wear/abrasion, high-temp (WC stable to ~1200°C in non-oxidizing), expensive - for abrasive high-temp (furnace gas with particles, catalytic cracking catalyst); (c) bare stainless: for clean high-temp gas (no abrasion), lowest cost. NACE MR0175 / ISO 15156 anti-sulfur explained: (a) NACE MR0175 specifies materials for oil/gas production containing H2S (sour service) - prevents sulfide stress cracking (SSC); (b) 316L (low carbon, annealed) meets NACE MR0175 for certain H2S partial pressures; (c) for sour high-temp service, specify 316L + NACE; (d) hardness must be controlled (NACE limits hardness to HRC 22 for carbon steel, stainless has specific limits). API 607 fire-safe explained: (a) API 607 tests soft-seated ball valves after exposure to fire (~750-800°C for 30 min); (b) requirements: external leakage ≤ specified, internal leakage ≤ specified, valve operable; (c) this valve: metal backup seats (if soft seats burn, metal contains), graphite packing (maintains stem seal), metal wound gasket (body seal), anti-static (prevents ignition); (d) 30-minute fire containment = time for emergency response (shut off upstream, evacuate, activate fire suppression). Actuation for high-temp: (a) manual (handwheel/worm gear) - standard, no utility, reliable; worm gear for large DN/high torque; (b) pneumatic - fast response, remote/auto, ATEX explosion-proof for hazardous; note: high-temp valve body conducts heat to actuator - may need thermal isolation bracket or extended bonnet to protect actuator/packing; (c) electric - 4-20mA modulating or on-off, DCS/PLC, explosion-proof optional; also needs thermal isolation. Important high-temp notes: (a) thermal expansion: at high temp, valve expands - pipeline must allow for thermal growth (use expansion joints or proper supports); (b) thermal cycling (frequent temp changes) is harder than steady temp - specify if cycling (may upgrade to 310S/2520 + elastic metal seal); (c) oxidation: at >800°C, stainless oxidizes (forms scale) - 310S/2520 resist better; (d) carburization/sulfidation: in certain furnace gases, materials may carburize or sulfidize - specify gas composition; (e) actuator/packing cooling: for >400°C, use extended bonnet or thermal isolation bracket to keep packing/actuator cooler; (f) warm-up: for cold start to high temp, warm up gradually to avoid thermal shock (especially for large valves); (g) the valve is for on-off shut-off (not throttling - high-temp throttling causes severe seat erosion; use control valve for regulation). The valve is manufactured under strict quality control with 100% body hydrostatic test (1.5×PN), 100% seat leak test (1.1×PN), 100% air tightness, PMI material verification, NDT of body castings, high-temp test (if specified), fire test (API 607, if specified), ball coating thickness/adhesion test, and stem nitride hardness test. With an 18-month warranty and OEM/ODM customization (material, size, pressure, seal, actuation, explosion-proof, fire-safe, special high-temp coating, extended bonnet, thermal isolation), this valve is a reliable, full-stainless, high-temperature, metal-seal ball valve solution for global extreme high-temperature industrial pipelines.

1.Full Stainless Heat-Resistant Body to 1200°C

Full stainless body in 304/316L/310S/2520 heat-resistant grades - 304 general ≤550°C, 316L superior corrosion + NACE MR0175 anti-sulfur ≤600°C, 310S austenitic heat-resistant to ~1000°C, 2520 dual-phase heat-resistant to ~1200°C. Conventional model -40~550°C, special coated model to 1200°C. Maintains mechanical properties, no embrittlement/softening under long-term high-temp. No rust/iron contamination. Precision casting, high structural strength.

2.Elastic Metal + All-Metal Hard Seal <0.001% Leak

Innovative elastic metal seal (flexible metal seat conforms to ball, compensates thermal expansion mismatch) + all-metal hard seal - ball/seat precision lapped to 100% matched contact, leakage <0.001% ANSI (near-zero metal seal). Soft seal PTFE/PEEK (≤250°C zero leakage) or hard seal tungsten carbide/Stellite alloy (high-temp/abrasive). Ball SS/Stellite 6/HVOF WC coated (HRC 70+). No soft material to degrade at high temp.

3.NACE Anti-Sulfur + Strong Corrosion Resistance

316L body passed NACE MR0175 / ISO 15156 anti-sulfur certification - stable in H2S/sour/corrosive environments, prevents sulfide stress cracking. Full stainless resists high-temp steam, corrosive chemicals, sulfide, oxidation. No rust or corrosion scaling. Suitable for harsh corrosive high-temp service long-term. 316L low-carbon for intergranular corrosion resistance.

4.API 607 Fire-Safe + Anti-Static + Nitrided Stem

Anti-static - metal-to-metal contact forms electrostatic channel (no extra device). API 607 fire-safe - flexible graphite packing + metal wound gasket maintain sealing 30 minutes in fire (metal backup contains if soft seats degrade). Stem nitrided (case-hardened, wear/galling resistant) + blow-out proof (bottom-retained shoulder). Safe for hazardous high-temp flammable media.

5.Modular Low-Maintenance + 50% Longer Cycle

Modular body/seat/stem design - easy disassembly and maintenance, seat/ball/stem replaceable. High-temp materials + metal hard seal = less wear, maintenance cycle extended 50% vs ordinary valves, reducing downtime and cost. Extended bonnet / thermal isolation bracket optional (for >400°C to protect packing/actuator). Warm-up procedure recommended for thermal cycling.

6.Multi-Drive + Multi-Connection + Global Standards

Manual (handwheel/worm gear), pneumatic (fast response, ATEX explosion-proof), electric (4-20mA, explosion-proof optional, DCS/PLC remote). Connections: flange (ANSI B16.5/DIN2543), thread (NPT/BSPT), butt weld BW, socket weld SW. DN15-300 (custom DN800), PN16-100 (Class150-900, custom 100MPa). API 6D/608/598/ASME B16.34/DIN3357/ISO5208. CE/ISO/API607. Petrochemical, power, metallurgy, building materials, pharma/food/aerospace. 18-month warranty, OEM/ODM.

A Stainless Steel High-Temperature Ball Valve operates on the principle of a ball with a through-hole that rotates 90° between fully open and fully closed, constructed in full heat-resistant stainless steel (304/316L/310S/2520) with advanced high-temperature sealing (elastic metal seal + all-metal hard seal, with soft PTFE/PEEK or hard WC/Stellite options), engineered to maintain reliable shut-off at temperatures up to 1200°C and pressures up to 100MPa where ordinary valves suffer seal failure, material embrittlement/softening, and rapid wear. The valve consists of a full stainless body (one-piece or two-piece, flanged/threaded/welded ends), a ball (stainless/Stellite 6/HVOF WC coated), valve seats (elastic metal + metal hard seal, or soft PTFE/PEEK), a nitrided blow-out proof stem, flexible graphite packing, a grease/thermal isolation fitting, and a handle/actuator (manual/pneumatic/electric). The high-temperature material principle is the core differentiator: (1) at high temperature, ordinary carbon steel loses strength (softens above ~425°C), oxidizes, and may creep; standard 304/316 stainless oxidizes above ~600°C; (2) 310S (25Cr-20Ni) has high Cr and Ni that form a dense, adherent Cr2O3/NiO oxide scale at high temp - this scale protects the base metal from further oxidation, allowing continuous service to ~1000°C; 310S also has good creep strength (resistance to slow deformation under load at high temp); (3) 2520 (0Cr25Ni20) has even higher Cr/Ni and dual-phase structure - better oxidation and creep resistance, continuous to ~1200°C; (4) at low temperature (-40°C), austenitic stainless (304/316L/310S/2520) does NOT have a ductile-brittle transition (unlike carbon steel, which becomes brittle below ~-29°C) - so the valve works from -40°C to 1200°C with the same family; (5) material is selected by maximum continuous temperature and medium corrosion (316L for corrosive/sour, 310S/2520 for extreme high-temp). The ball rotation principle (same as other ball valves): (1) handle/actuator rotates stem 90°; (2) stem drives ball; (3) at 0° (closed), ball through-hole perpendicular to flow - solid ball surface blocks port, seats seal; (4) at 90° (open), ball through-hole aligns with flow - full-port unobstructed straight-through flow; (5) quarter-turn fast operation. The high-temperature sealing principle (critical differentiator): (1) Problem at high temp: soft seals (PTFE) degrade (>180°C), PEEK (>250°C); materials expand at different rates (ball vs seat vs body), causing seal gap; ordinary metal seal is rigid and doesn't conform; (2) Elastic metal seal solution: a flexible metal seat ring (e.g., stainless ring with spring, bellows, or elastic geometry) installed in the body - under medium pressure, the flexible ring is pushed against the ball, and its elasticity allows it to conform to the ball surface even as dimensions change with temperature; it compensates for differential thermal expansion (ball and seat expand at different rates - elastic ring absorbs the difference); this provides a metal-to-metal seal with compliance - better than rigid metal seal; (3) All-metal hard seal: ball and seat are both metal, precision lapped together (matched spherical surfaces, 100% contact) - the lapping process creates perfectly mating surfaces; no soft material involved - works at 1200°C; wear/abrasion resistant (Stellite/WC); fire-safe (metal doesn't burn); leakage <0.001% ANSI (metal seal has slight leakage per ISO 5208 Class VI/D, but very low); (4) Soft seal option (for ≤250°C): PTFE (≤180°C) or PEEK (≤250°C) - zero leakage (bubble-tight), but not for high-temp; (5) Hard seal material: Stellite 6 (Co-Cr, HRC 40-45, to ~800°C), tungsten carbide WC (HRC 70+, to ~1200°C, HVOF coated), 2520 stainless (to 1200°C); (6) Composite seal (optional): metal seat with soft insert (graphite/PTFE) - combines metal strength with soft zero leakage, for mid-temp; (7) Seat selection: by temperature and medium - clean gas ≤250°C → PEEK; high-temp clean → metal (Stellite); abrasive high-temp (catalyst, furnace particles) → HVOF WC; sour/corrosive → 316L + Stellite. The ball coating principle: (1) Stellite 6 overlay: cobalt-based alloy welded onto ball surface, then ground/lapped - HRC 40-45, good high-temp hardness retention, wear and corrosion resistant - common for high-temp valves; (2) HVOF WC coating: High Velocity Oxy-Fuel process sprays molten tungsten carbide particles at supersonic speed onto ball - forms very dense, well-bonded coating, HRC 70+, extreme wear/abrasion resistance, stable to ~1200°C (in non-oxidizing; WC oxidizes above ~600°C in air, so for oxidizing high-temp, use Stellite or 2520); (3) bare stainless: for clean high-temp gas (no abrasion), lowest cost; (4) coating improves ball life and reduces seat wear (harder smoother ball = less seat abrasion). The nitrided stem principle: (1) stem surface is gas-nitrided - nitrogen diffuses into steel surface, forming hard iron nitrides (case depth ~0.1-0.5mm, surface hardness HV 600-1000); (2) nitriding improves wear resistance and galling resistance (stem doesn't seize in packing at high temp); (3) nitrided stem has corrosion resistance (better than bare carbon steel); (4) anti-blowout: stem has bottom-retained shoulder under packing - cannot eject under pressure; (5) at high temp, stem and packing expand - nitrided hard surface resists galling from thermal cycling. The high-temperature packing principle: (1) flexible graphite packing (not PTFE - PTFE fails >180°C) - graphite is stable to ~650°C in oxidizing atmosphere, higher in non-oxidizing/steam; (2) graphite packing is compliant (seals stem irregularities), self-lubricating (low friction), fire-safe; (3) for extreme high-temp (>650°C), may use braided graphite with Inconel wire reinforcement or lamellar graphite; (4) extended bonnet (optional for >400°C) - lengthens distance between body (hot) and packing (cooler) - keeps packing below its temp limit, protects actuator. The anti-static principle (metal-seal version): (1) all-metal construction (ball, seat, stem, body all metal) provides inherent electrical continuity - ball contacts metal seat, seat contacts body, stem contacts ball/body; (2) no additional anti-static spring needed (unlike soft-seat valves where PTFE insulates); (3) static electricity from ball rotation conducts to ground - prevents sparks in flammable high-temp gas. The API 607 fire-safe principle: (1) if valve is exposed to fire (~750-800°C), soft seats (if used) may degrade - metal backup seats behind maintain containment; (2) flexible graphite packing maintains stem seal at fire temp (graphite doesn't burn); (3) metal wound gasket (spiral-wound stainless+graphite) maintains body/bonnet seal; (4) anti-static prevents ignition; (5) valve must remain operable (manual) after fire - to close off flow; (6) 30-minute containment = emergency response time. The thermal isolation / extended bonnet principle (optional): (1) for high-temp service (>400°C), heat conducts from body up stem to packing/actuator; (2) extended bonnet adds length to stem/bonnet - heat dissipates along length, packing/actuator stay cooler; (3) thermal isolation bracket (between valve and actuator) - breaks heat conduction path, protects actuator (pneumatic/electric have temp limits ~70-80°C); (4) cooling fins (optional) - increase heat dissipation area. The actuation principle: (1) manual handwheel/worm gear - standard, reliable, no utility; worm gear for large DN/high torque; (2) pneumatic - compressed air, fast, remote/auto, ATEX explosion-proof; requires thermal isolation to protect actuator from heat; (3) electric - motor+gearbox, 4-20mA for modulating or on-off, DCS/PLC, explosion-proof; also needs thermal isolation; (4) note: high-temp valve should not have plastic/nylon actuator parts near hot body - use metal actuator or isolation. The valve is installed in pipeline (flange/thread/weld). For high-temp operation: (a) warm up gradually - especially from cold to >400°C - rapid thermal change causes thermal shock (cracking, seal gap); follow warm-up curve (e.g., 50°C/hour); (b) allow thermal expansion - pipeline must have expansion joints or flexible supports (valve grows at high temp); (c) cool down gradually - avoid quenching; (d) thermal cycling (frequent heat/cool) accelerates fatigue - specify 310S/2520 + elastic metal seal for cycling; (e) periodic inspection - check packing, seats, coating (high-temp causes gradual degradation); (f) for >800°C oxidizing, expect some oxide scale formation - 310S/2520 minimize but don't eliminate. For maintenance: (a) cool valve to ambient before service (never service hot); (b) modular design - remove body, replace seats/ball/stem; (c) metal seats may need re-lapping (if worn) or replacement; (d) repack with graphite; (e) check ball coating (HVOF/Stellite) - recoat if worn. Important: (a) metal seal is not bubble-tight - it has slight leakage (ISO 5208 Class VI/D, <0.001% ANSI) - if zero leakage required at high-temp, use elastic metal + composite (graphite insert) or accept slight leak; (b) not for throttling - high-temp throttling causes severe seat erosion (high-velocity flow across seat); use on-off only; (c) HVOF WC in oxidizing >600°C - WC oxidizes (forms WO3, volatile) - use Stellite or 2520 for oxidizing high-temp; (d) NACE for sour - specify 316L + NACE, verify H2S partial pressure; (e) actuator temp limit - pneumatic/electric actuators are typically rated -20~70°C - use thermal isolation/extended bonnet for high-temp valve; (f) size/pressure - for DN>300 or PN>100, consult factory (custom); (g) the valve is for on-off shut-off service in high-temp media.

• Petrochemical Industry

Catalytic cracking units, ethylene cracking devices, hydrogenation reactors, high-temp oil/gas, cracking gas pipelines (instantaneous 900°C+), high-temp reaction media - 310S/2520 body, Stellite/WC metal seal, anti-static+API607 fire-safe, NACE anti-sulfur for H2S, high-pressure PN up to 100MPa, pneumatic/electric DCS/PLC, reliable for extreme high-temp hazardous hydrocarbon process.

• Power Industry

Supercritical thermal power units (620°C/25MPa steam), nuclear power plants, main steam pipelines, coolant systems, high-temp steam control - 316L/310S body, metal/PEEK seal, graphite packing, extended bonnet, manual/electric, stable long-term at 620°C/25MPa, energy-saving vs gate valves, fire-safe, reliable for critical power generation high-temp high-pressure.

• Metallurgy Industry

Steelmaking converter flue gas purification, non-ferrous metal smelting, high-temp furnace gas up to 1200°C, molten metal particle erosion - 2520 body, HVOF WC coated ball (HRC70+ wear/abrasion), all-metal hard seal, resists furnace gas erosion, service life 5× ordinary valves, manual/pneumatic, for extreme high-temp abrasive metallurgical gas.

• Building Materials + Pharmaceutical/Food/Aerospace

Glass melting furnaces, ceramic kilns (high-temp flue gas/material control), pharmaceutical high-temp sterilization pipelines, food high-temp processing, aerospace high-temp fuel lines - 304/316L sanitary surface (Ra≤0.4μm) to prevent material adhesion, PEEK/metal seal, full stainless no iron contamination, reliable for high-temp clean/sanitary and extreme aerospace service.

• General High-Temp Industrial + Oil & Gas Sour

Thermal oil systems, high-temp gas pipelines, sulfide/corrosive high-temp media, oil & gas sour service (H2S), general industrial high-temp process - 316L NACE MR0175 anti-sulfur, full stainless corrosion, elastic metal seal, flange/thread/weld multi-connection, manual/pneumatic/electric, modular low-maintenance, API607/CE/ISO, reliable for diverse high-temp corrosive industrial pipelines.

Our Stainless Steel High-Temperature Ball Valves are manufactured under an ISO 9001:2015 certified quality management system, with every valve undergoing rigorous inspection and testing at each production stage - because these valves are used for extreme high-temperature (up to 1200°C), high-pressure (up to 100MPa), corrosive/sulfide-bearing on-off service in petrochemical, power, metallurgy, building materials, and aerospace where seal failure, material degradation, stem galling, or coating failure causes safety hazards, process disruption, and costly downtime (high-temperature materials require precise chemistry/heat treatment, metal seats require precision lapping, ball coatings require adhesion/thickness verification, and fire-safe requires graphite packing/metal gasket verification).

Raw material control: every body/ball/stem material batch comes with a mill test certificate (MTC EN 10204 3.1) verifying chemical composition and mechanical properties; 304/316L verified for Cr/Ni/Mo and low carbon (L grades) by PMI spectrometer; 310S verified for 25Cr-20Ni and high-temp oxidation; 2520 verified for high Cr/Ni dual-phase; 316L verified for NACE MR0175 compliance (hardness, chemistry); Stellite 6 verified for Co/Cr/W; WC powder verified for purity/particle size; graphite packing verified for grade/temp rating.

Body manufacturing (full stainless heat-resistant): (a) casting - precision investment casting (stainless) or sand casting; (b) heat treatment (solution annealing for austenitic stainless - critical for corrosion and high-temp properties; 310S/2520 solution treated at ~1050-1100°C then quenched); (c) 100% visual inspection (no casting defects); (d) NDT of body - radiographic or ultrasonic inspection of critical sections (ball chamber, flange necks, wall) per spec; (e) wall thickness measurement - ultrasonic, per ASME B16.34; (f) flange/end machining - flange face (RF/RTJ), bolt holes, weld end preparation, thread; (g) ball chamber/seat recess machining - precise bore, seat recess, stem bore; (h) chemical analysis, mechanical test, hardness test per heat; (i) for NACE, hardness test (per MR0175 limits) and microstructure. Ball manufacturing: (a) stainless/Stellite 6/HVOF WC ball - forged/cast, precision-machined spherical surface; (b) coating: Stellite 6 overlay (welded, then machined) or HVOF WC (sprayed, then ground); (c) coating verification: thickness (ultrasonic/magnetic), adhesion (bond test per ASTM C633 or scratch), hardness (micro-HRC), porosity (metallographic); (d) precision grinding/lapping - ball surface ground to match seat, Ra≤0.2μm for metal seal (lapped to seat); (e) verified for sphericity, bore diameter, coating integrity.

Seat manufacturing (high-temp metal seal): (a) elastic metal seat ring - machined from stainless/Stellite, with elastic feature (spring/bellows), heat treated; (b) all-metal hard seat - Stellite/WC/2520, machined, then lapped with ball (matched pair - ball and seat lapped together to 100% contact, verified by blue contact test); (c) soft seat (PTFE/PEEK) - molded/machined; (d) verified for flatness, contact pattern (blue test ≥90% coverage), hardness.

Stem manufacturing: (a) stem machined, anti-blowout shoulder verified; (b) nitriding - gas nitriding per spec (temperature, time, ammonia dissociation), case depth and surface hardness verified (HV test); (c) straightness/concentricity verified; (d) anti-galling test (optional).

Packing & gasket: flexible graphite packing rings inspected (density, graphite content, temp rating); metal wound gaskets inspected (stainless strip + graphite filler); for fire-safe, all components verified.

Assembly: (1) install seats (elastic metal + metal backup, or soft) in body; (2) insert ball (matched to seat - do not mix pairs); (3) install stem, graphite packing, packing gland, thermal isolation/extended bonnet (if specified), handle/actuator; (4) ball rotation tested - smooth 90° without binding at ambient and (if test) high temp; (5) anti-static continuity tested (<10Ω for metal seal); (6) fire-safe components verified (graphite packing, metal gasket, metal backup); (7) NACE components verified.

Pressure testing: (1) 100% body hydrostatic shell test at 1.5× rated pressure - zero visible leakage; (2) 100% seat leak test at 1.1× rated pressure - soft seal zero leakage, metal seal ≤ISO 5208 Class VI/D (<0.001% ANSI); (3) 100% air tightness test - low-pressure air; (4) high-temperature test (if specified) - test at elevated temp (e.g., 200°C/400°C) to verify seal at temp; (5) API 607 fire test (if specified) - 30-minute fire exposure, verify leakage/operability; (6) thermal cycling test (if specified) - heat/cool cycles, verify seal after cycling; (7) NACE test (if specified) - hardness, sulfide stress cracking test.

Function testing: full-port Cv verified; actuation torque measured at ambient; face-to-face/end dimensions verified; ball coating verified; nitride stem hardness verified; seat contact pattern verified (blue test).

Coating & marking: exterior - stainless natural/pickled/passivated (high-temp valves usually not painted - paint burns); high-temp aluminum paint optional (for ≤400°C); valve permanently marked with material, pressure, size, seal type, temp rating, NACE/API 607, and certifications (stamped or laser-engraved - tags may not survive high temp, so body stamping preferred).

Documentation: shipped with hydrostatic test report, material certificate (MTC 3.1), NDT report, PMI report, ball coating report (thickness/adhesion/hardness), nitride report, seat lap contact report, high-temp/fire/NACE test report (if applicable), warm-up/cool-down procedure, thermal expansion guidance, and installation/operation/maintenance manual including warm-up curve, packing/seat maintenance, coating care, and actuation thermal isolation.

Warranty: 18 months from shipment or 12 months from installation (valve body); pneumatic/electric actuator 12 months; note: high-temp valves have wear items (seats, packing, coating) - warranty covers manufacturing defects, not normal high-temp wear; extended warranty and third-party inspection (BV, SGS, TUV, API) available.

Q: 304 vs 316L vs 310S vs 2520 - which stainless for my high-temperature service?

A: This high-temperature ball valve offers four stainless steel body grades - selection depends on maximum continuous operating temperature, medium corrosion (especially H2S/sour), and cost. 304 (18Cr-8Ni austenitic stainless, UNS S30400): - Temp: continuous to ~550°C (oxidation limits above ~600°C; intermittent to ~650°C). - Corrosion: good for general corrosion (water, steam, oil, mild chemical, food); not for chlorides (pitting) or strong acids. - Cost: lowest of the four. - Best: general high-temp water/steam/oil/gas, ≤550°C, non-corrosive, cost-sensitive. 316L (16Cr-10Ni-2Mo, low carbon, UNS S31603): - Temp: continuous to ~600°C (similar to 304, Mo doesn't significantly raise oxidation temp). - Corrosion: superior to 304 - Mo (2%) adds pitting/corrosion resistance (chlorides, mild acids); low carbon (≤0.03%) prevents intergranular corrosion after welding; NACE MR0175 / ISO 15156 certified for sour service (H2S) - prevents sulfide stress cracking. - Cost: ~20-40% more than 304. - Best: corrosive chemical, oil & gas sour service (H2S), coastal/marine, food/pharma, ≤600°C. 310S (25Cr-20Ni, low carbon, UNS S31008): - Temp: continuous to ~1000°C, intermittent to ~1050°C - high Cr (25%) and Ni (20%) form protective Cr2O3/NiO oxide scale at high temp, resisting oxidation; good creep strength (resistance to slow deformation under load at high temp). - Corrosion: good high-temp oxidation, carburization resistance; not as good as 316L for aqueous corrosion (lower Mo). - Cost: ~2-3× 304. - Best: high-temp furnace parts, heat treatment, thermal cycling, 550-1000°C gas, kiln/flue gas, annealing furnaces. 2520 (0Cr25Ni20 / 310S mod, UNS S31008 variant / sometimes called 314): - Temp: continuous to ~1200°C - higher Cr/Ni than 310S, dual-phase (austenite + some ferrite) structure, excellent oxidation and creep at extreme temp; resists thermal cycling and thermal shock better. - Corrosion: excellent high-temp oxidation, good carburization/sulfidation resistance (in some environments). - Cost: ~3-4× 304 (most expensive). - Best: extreme high-temp 1000-1200°C, furnace gas, glass/ceramic kilns, steel converter flue gas, cracking furnaces, severe thermal cycling. Selection guide by temperature: (a) ≤550°C, general/non-corrosive → 304 (most economical). (b) ≤600°C, corrosive/sour (H2S)/chloride → 316L (NACE). (c) 550-1000°C, high-temp gas/oxidizing, thermal cycling → 310S. (d) 1000-1200°C, extreme high-temp, kiln/furnace/cracking → 2520. (e) ≤600°C but food/pharma/sanitary → 316L (low carbon, polishable, corrosion). (f) High-temp + sour (H2S) → 316L (if ≤600°C) or consult (310S/2520 NACE compliance depends on H2S partial pressure and temp - verify). Other considerations: (a) Thermal cycling (frequent heat/cool) is harder than steady temp - 310S/2520 handle cycling better (higher high-temp strength, better oxide scale adhesion); 304/316L may fatigue under severe cycling. (b) Carburizing/sulfidizing atmospheres (e.g., furnace gas with CO, H2S) - 310S/2520 resist better (high Ni); 304/316L may carburize. (c) Molten metal/slag - none of these are for molten metal contact (use refractory); for flue gas with particles, use HVOF WC coated ball. (d) Weldability: 304/316L/310S are weldable (austenitic); 2520 may have some hot-cracking issues (use proper filler, e.g., 310/312). (e) Cost vs life: 310S/2520 cost more upfront but last much longer at high temp (304 may fail in months at 800°C; 310S lasts years) - life-cycle cost often favors 310S/2520 for >600°C. Important: (a) Temperature ratings are for continuous service in air/oxidizing - in reducing/carburizing/sulfidizing atmospheres, max temp may be lower (consult). (b) At >800°C, all stainless oxidizes (forms scale) - 310S/2520 slow it but don't eliminate; expect some scale over years. (c) NACE MR0175 has specific limits on H2S partial pressure, temp, and material hardness - provide H2S content and temp for NACE verification. (d) For high-temp + high pressure, verify material strength at temp (ASME B16.34 pressure-temp ratings - allowable pressure drops at high temp). When ordering, provide maximum continuous temperature, medium composition (especially H2S/chloride/particles), pressure, and thermal cycling frequency - we will recommend 304, 316L (NACE), 310S, or 2520. For most high-temp industrial service ≤550°C, 304 or 316L is sufficient; for >550°C, 310S or 2520 is required.

Q: Metal hard seal vs soft seal - which for high temperature, and is zero leakage possible?

A: This valve offers soft seal (PTFE/PEEK) and hard seal (elastic metal + all-metal, WC/Stellite) options - selection depends on temperature, leakage requirement, and abrasion. Soft seal (PTFE/PEEK): - PTFE: ≤180°C, zero leakage (bubble-tight), low cost, low friction, chemical resistant - but fails above 180°C (cold-flows, then degrades). - PEEK: ≤250°C, zero leakage, high strength, better than PTFE at high temp - but fails above 250°C. - Leakage: zero (bubble-tight, ≤0.1ppm per spec). - Best: clean media, ≤250°C, where zero leakage is required (chemical, food, pharma, low-temp steam). - Limitation: not for >250°C, not for abrasive (soft material wears). Hard seal (elastic metal + all-metal): - Elastic metal seal: flexible metal seat ring (stainless/Stellite with spring/elastic geometry) - conforms to ball under pressure, compensates thermal expansion mismatch, provides metal-to-metal seal with compliance. - All-metal hard seal: ball and seat both metal (Stellite 6, WC, 2520), precision lapped together (matched pair, 100% contact) - no soft material, works to 1200°C, wear/abrasion resistant, fire-safe. - Leakage: <0.001% ANSI (near-zero, but not bubble-tight - metal seal has slight leakage per ISO 5208 Class VI/D; measured in cc/s or % of Cv, not "zero bubbles"). - Best: high-temp >250°C, abrasive (furnace gas, catalyst), fire-safe, where soft seal fails. - Limitation: slight leakage (not zero), higher torque, more expensive, requires precision lapping. Composite seal (optional): - Metal seat with soft insert (graphite/PTFE in metal ring) - combines metal strength with soft zero leakage, for mid-temp (~250-400°C); graphite insert may degrade at very high temp. Is zero leakage possible at high temperature? (a) At ≤250°C: YES - PEEK soft seal gives zero leakage (bubble-tight). (b) At 250-400°C: POSSIBLE with composite seal (metal + graphite/PEEK insert) - zero or near-zero, but insert life limited. (c) At >400°C (to 1200°C): NOT truly zero - all-metal hard seal has slight leakage (<0.001% ANSI, ISO 5208 Class VI/D); this is inherent to metal-to-metal sealing (no soft material to conform perfectly); the leakage is very small but measurable. (d) If zero leakage is mandatory at >400°C: options - (i) use bellows seal (but bellows has temp limits), (ii) use double block & bleed (two metal seals with bleed between), (iii) accept slight leakage and verify it's acceptable for your medium (for high-temp steam/gas, slight leakage may be acceptable; for toxic/flammable, may need double block & bleed or different valve type). Important for high-temp: (a) PTFE MUST NOT be used above 180°C - it will cold-flow (extrude) then degrade, causing sudden seal failure and possible valve seizure. (b) PEEK above 250°C - may soften/creep; verify. (c) Metal seal leakage increases with wear - as seat/ball wear, leakage may increase over time; periodic inspection/re-lapping needed. (d) Elastic metal seal helps - the flexible ring compensates for wear and thermal expansion, maintaining better seal than rigid metal. (e) Lapped matched pairs - ball and seat must be lapped together (do not replace ball without seat, or vice versa - they are a matched pair); re-lap if worn. (f) For abrasive high-temp (furnace gas with particles, catalyst), use HVOF WC coated ball + Stellite/WC seat - hard surfaces resist erosion. (g) Thermal cycling causes metal seal to leak more (expansion/contraction opens micro-gaps) - elastic metal seal helps, but cycling accelerates wear. Selection: (a) ≤250°C, zero leakage required, clean → PEEK soft seal. (b) ≤180°C, zero leakage, general → PTFE (cheaper). (c) 250-400°C, near-zero leakage → composite seal (metal + graphite/PEEK). (d) >400°C to 1200°C, high-temp/abrasive/fire-safe → elastic metal + all-metal hard seal (accept slight leakage <0.001%). (e) >400°C, zero leakage mandatory → consult (double block & bleed, or different valve type - e.g., bellows globe). When ordering, specify temperature, leakage requirement (zero or acceptable slight), medium abrasion - we will recommend soft (PTFE/PEEK), composite, or hard (elastic metal + all-metal WC/Stellite) seal. For most high-temp >250°C service, elastic metal + all-metal hard seal is standard.

Q: Up to 1200°C - what does that really mean, and what do I need for my 800°C furnace gas?

A: The -40°C to 1200°C range is the overall capability of the valve family with different material/seat/coating configurations - a single standard valve does not cover the entire range; you must specify your actual temperature and we configure the valve accordingly. Temperature sub-ranges and configurations: (a) -40°C to 550°C (conventional model): body 304/316L, seat PEEK or metal, graphite packing, standard bonnet - most common. (b) 550°C to 800°C: body 310S (or 316L if ≤600°C), seat Stellite 6 metal hard seal, graphite packing, extended bonnet recommended (to protect packing/actuator), ball Stellite 6 or bare 310S. (c) 800°C to 1000°C: body 310S, seat 2520/Stellite metal hard seal, graphite packing (or high-temp braided graphite with Inconel), extended bonnet + cooling fins, ball 310S/Stellite. (d) 1000°C to 1200°C (special high-temp model): body 2520, seat 2520/WC metal hard seal, high-temp packing (lamellar graphite / Inconel-reinforced), extended bonnet + cooling fins + thermal isolation, ball 2520 or HVOF WC (note: WC oxidizes in air >600°C - for oxidizing 1200°C, use 2520/Stellite, not WC), special high-temp coating (e.g., ceramic coating on exterior for oxidation). For your 800°C furnace gas: (a) Body: 310S (good for 800°C continuous, oxidation resistant) - or 2520 if furnace gas is severe (high dust, thermal cycling, sulfur). (b) Seat: all-metal hard seal - Stellite 6 (good to ~800°C) or 2520 (to 1200°C); elastic metal seat recommended (compensates thermal cycling). (c) Ball: Stellite 6 overlay (HRC 40-45, good at 800°C) - if furnace gas has abrasive particles (dust, ash), use HVOF WC (but note WC oxidizes in air >600°C; for oxidizing furnace gas at 800°C, Stellite or 2520 may be better - consult on gas composition). (d) Packing: flexible graphite (good to ~650°C in oxidizing; at 800°C body, use extended bonnet so packing stays cooler - packing area should be <450°C). (e) Bonnet: extended bonnet (lengthens distance from hot body to packing/actuator) + optional cooling fins - essential at 800°C to protect packing and actuator. (f) Actuator: if automated (pneumatic/electric), use thermal isolation bracket between valve and actuator (actuators rated ~70°C max); manual is simplest for 800°C. (g) Gasket: metal wound (stainless+graphite) - not PTFE. (h) Pipeline: allow for thermal expansion (valve grows at 800°C - a DN100 valve grows ~1mm per 100°C, so ~8mm at 800°C - pipeline must accommodate with expansion joints/flexible supports). (i) Warm-up: warm up gradually (e.g., 50°C/hour) from ambient to 800°C - rapid thermal shock can crack 310S/2520 or open seal gaps. (j) Cool down: gradual cool-down (avoid quenching). What "1200°C" means and limits: (a) 1200°C is continuous gas temperature for 2520 body in oxidizing atmosphere - not molten metal, not fire impingement. (b) At 1200°C, strength is reduced (allowable pressure per ASME B16.34 drops significantly - at 1200°C, 2520 allowable stress is much lower than at ambient; verify pressure rating at your temp). (c) Oxidation: at 1200°C, even 2520 oxidizes (forms scale) - scale may flake off over time; expect periodic descaling/inspection. (d) Not for molten metal/slag - these valves are for gas/vapor/fluid, not molten metal contact. (e) Actuator/packing are the weak links at 1200°C - extended bonnet/cooling/thermal isolation are mandatory; manual operation is most reliable. (f) Cycle life at 1200°C is reduced (thermal fatigue) - specify if frequent cycling. Important: (a) Always specify actual max continuous temp (not just "high temp") - we configure accordingly. (b) Specify atmosphere (air/oxidizing, reducing, carburizing, sulfidizing, H2S, dust/particles) - affects material/coating selection. (c) Specify pressure at temp - allowable pressure drops at high temp (ASME B16.34). (d) Specify thermal cycling (steady vs frequent heat/cool) - cycling needs 310S/2520 + elastic metal seal. (e) At >800°C, we recommend a technical review - provide application details, we may recommend 2520, special coating, extended bonnet, cooling fins, and verify pressure/temp rating. When ordering for 800°C furnace gas, specify 310S or 2520 body, all-metal hard seal (Stellite/2520), extended bonnet + cooling fins, graphite packing, manual or actuator with thermal isolation, metal wound gasket - and provide gas composition, pressure, and cycling frequency for exact configuration.

Q: NACE MR0175 anti-sulfur - what is it and do I need it?

A: NACE MR0175 / ISO 15156 (now officially ISO 15156 / NACE MR0175) is a standard specifying materials requirements for oil and gas production equipment used in H2S-containing (sour) environments - to prevent sulfide stress cracking (SSC) and other environmentally assisted cracking. What is sulfide stress cracking (SSC): (a) in oil/gas with H2S (hydrogen sulfide), hydrogen atoms diffuse into steel; (b) at high hardness or tensile strength, hydrogen causes brittle cracking (SSC) - can cause sudden catastrophic failure; (c) SSC is most severe at room temperature (not high temp - hydrogen diffusion and cracking peak around ~20-60°C; at high temp >100°C, SSC risk decreases, but other cracking like HIC/SOHIC may occur). What NACE MR0175 requires: (a) material chemistry - limits on carbon, manganese, sulfur, phosphorus, etc.; (b) hardness limits - e.g., carbon steel ≤HRC 22 (or 235 HB), stainless steel has specific limits (e.g., 316L annealed ≤HRC 22 or specific solution-annealed condition); (c) heat treatment - materials must be in proper condition (annealed, normalized+tempered, solution treated); (d) cold work limits - excessive cold working can increase hardness and cause SSC; (e) testing - optional SSC testing (e.g., NACE TM0177) for critical service. Do you need NACE MR0175? (a) YES, if: your medium contains H2S (hydrogen sulfide) at partial pressure above NACE thresholds (generally >0.0003 bar / 0.05 psi H2S partial pressure, depending on pH, chloride, temp), and equipment is in the SSC risk temperature range (~0-100°C / 32-212°F); this includes oil/gas production, gathering, processing, sour gas pipelines, refinery sour service. (b) NO, if: no H2S, or H2S below threshold, or service temp >100°C (SSC risk low - but verify other cracking modes), or non-oil/gas (chemical, power, water with no H2S). (c) For high-temperature sour service (>100°C): SSC risk decreases, but high-temperature hydrogen attack (HTHA) for carbon steel, or polythionic acid SCC for stainless during shutdown (when sulfides react with air/water to form polythionic acid - 316L stabilized/annealed resists better) may apply - consult. This valve's NACE compliance: (a) 316L body is certified to NACE MR0175 / ISO 15156 (solution-annealed, low carbon, hardness within limits) - suitable for sour service within NACE limits. (b) 304 may also comply if properly annealed, but 316L is preferred for sour (Mo adds pitting resistance, low carbon). (c) 310S/2520 - NACE compliance depends on H2S partial pressure and temp (high-nickel alloys can have different cracking behavior - verify for sour high-temp). (d) Trim (ball, seat, stem) - must also be NACE-compliant (hardness limits; Stellite/WC coatings may have hardness limits - consult; for sour service, may use 316L trim or NACE-approved hardfacing). (e) Welds - weld filler and post-weld heat treatment must be NACE-compliant. Important: (a) NACE MR0175 is application-specific - the same material may be acceptable for one sour condition but not another (depends on H2S partial pressure, pH, chloride, temp, pressure); provide your service conditions for a NACE compliance statement. (b) Hardness is key - NACE limits hardness; our 316L is solution-annealed (soft, ≤HRC 22) - do not cold-work or weld without proper procedure (can increase hardness). (c) For sour high-temp (e.g., 300°C H2S), SSC is less likely but polythionic acid SCC during shutdown is a risk - 316L (stabilized/low carbon) resists; keep equipment dry during shutdown or neutralize. (d) Certification: we can provide NACE MR0175 material certificates, hardness reports, and (if required) SSC test reports (NACE TM0177). (e) NACE does NOT mean "corrosion-proof" - it means resistant to SSC; general corrosion/erosion still depends on medium. When ordering for sour service (H2S), specify 316L body + NACE MR0175 trim, and provide H2S partial pressure, total pressure, temp, pH, chloride content - we will confirm NACE compliance and provide certificates. For non-sour service, NACE is not needed and 304/310S/2520 can be used.

Q: Manual vs pneumatic vs electric for high-temperature - and do I need an extended bonnet?

A: This high-temperature ball valve supports manual, pneumatic, and electric actuation - selection depends on automation needs, speed, utility availability, and temperature (high temp affects actuator/packing). Manual (handwheel/worm gear): - Lever for small DN (≤100), worm gear for large DN/high torque. - No utility, most reliable at high temp (no electrical/pneumatic components to heat-damage), lowest cost. - Operator must be on-site (not remote). - Best: occasional operation, on-site access, high temp >400°C (where actuator heat protection is complex), cost-sensitive. Pneumatic: - Compressed air, rack-pinion, double/single-acting, fast response, remote/auto, ATEX explosion-proof for hazardous. - High-temp concern: pneumatic actuators are typically rated -20~70°C (seals, lubricants) - at high-temp valve, heat conducts up stem to actuator; must use thermal isolation bracket (breaks heat path) and/or extended bonnet (keeps actuator area cool). - Air supply must be dry (condensate can freeze/gum). - Best: automated, remote, fast operation, hazardous (intrinsically safe), has compressed air, with thermal isolation. Electric: - Motor+gearbox, 4-20mA modulating or on-off, DCS/PLC, explosion-proof optional (Exd II BT4). - High-temp concern: electric actuators rated -20~70°C (motor windings, electronics, lubricants) - must use thermal isolation bracket + extended bonnet; some high-temp electric actuators have heat-resistant rating (verify). - No compressed air needed. - Best: automated, remote, no air, non-hazardous or explosion-proof, with thermal isolation. Do I need an extended bonnet? (a) Extended bonnet = lengthened stem/bonnet assembly that increases distance between the hot valve body and the packing/actuator - heat dissipates along the extended length, keeping packing and actuator cooler. (b) When needed: generally for service temp >300-400°C (graphite packing can handle ~650°C, but actuator cannot; also, at >400°C, stem/packing area should be kept below ~450°C for reliable packing life). (c) Benefits: (i) protects packing (longer life, less frequent replacement); (ii) protects actuator (keeps below its temp limit); (iii) allows operator handwheel to be at a cooler, safer height; (iv) reduces heat loss to surroundings (some extended bonnets have insulation). (d) Cooling fins (optional on extended bonnet): increase heat dissipation area - for very high temp (>600°C) or where actuator must stay cool. (e) Thermal isolation bracket (between valve and actuator): a metal/ceramic spacer that breaks heat conduction - used with extended bonnet for automated valves. Guidance by temperature: (a) ≤200°C: standard bonnet, any actuation (no special heat protection needed). (b) 200-400°C: standard or slightly extended bonnet; for pneumatic/electric, consider thermal isolation bracket (actuator may get warm). (c) 400-600°C: extended bonnet recommended; for pneumatic/electric, extended bonnet + thermal isolation bracket mandatory (protect actuator); manual is fine. (d) 600-1000°C: extended bonnet + cooling fins; for automated, extended bonnet + cooling fins + thermal isolation (and verify actuator heat rating); manual strongly recommended. (e) 1000-1200°C: extended bonnet + cooling fins + thermal isolation + high-temp packing; manual recommended (automated is difficult/expensive at this temp - if required, use special high-temp actuator with water cooling or remote mounting). Important: (a) Never mount a standard pneumatic/electric actuator directly on a >400°C valve - actuator will overheat and fail (seals melt, electronics fail, lubricant breaks down); use extended bonnet + thermal isolation. (b) Manual is most reliable at extreme high temp - no heat-sensitive components; if automation is required, plan for thermal protection. (c) Extended bonnet adds height - verify installation space (valve + extended bonnet + actuator may be tall). (d) For buried/insulated pipelines, extended bonnet may extend through insulation - specify bonnet length. (e) Actuator cable/air line - use high-temp rated cable/tubing near hot valve. (f) Manual worm gear for large DN at high temp - gearbox may also need heat protection (grease rating) - verify. When ordering, specify actuation type and max temperature - for >400°C, we will include extended bonnet (and cooling fins if >600°C); for pneumatic/electric at >300°C, include thermal isolation bracket. For extreme high-temp (>600°C), manual is recommended unless automation is essential (then special high-temp actuator configuration required).

Q: What standards, testing, certifications, sizes, pressures, and warranty apply?

A: Design standard: API 6D, API 608, ASME B16.34 (pressure-temperature/wall thickness), DIN 3357, ISO 5208. Face-to-face standard: ANSI B16.10, API 6D. End connection standard: ANSI B16.5 (flange RF/RTJ), DIN 2543 (flange), ANSI B1.20.1 (NPT thread), ISO 7 (BSPT thread), ANSI B16.25 (butt weld), ANSI B16.11 (socket weld). Test standard: API 598, API 6D, ISO 5208; API 607 (fire-safe, optional); NACE TM0177 (SSC, optional); high-temp test (optional). Hydro test: Shell 1.5× rated pressure, Seat 1.1× rated pressure. Testing performed (100%): (1) Body hydrostatic shell test - zero visible leak. (2) Seat leak test - soft seal zero leakage (≤0.1ppm), hard seal ≤ISO 5208 Class VI/D (<0.001% ANSI). (3) Air tightness test - low-pressure air. (4) NDT - body casting (radiographic/ultrasonic). (5) PMI - material grade verification (spectrometer, especially 310S/2520 high-alloy). (6) Ball coating verification - thickness (ultrasonic), adhesion (bond test), hardness (micro-HRC), porosity. (7) Stem nitride verification - case depth, surface hardness (HV). (8) Seat lap contact - blue test ≥90% contact. (9) Torque/operation test. (10) Anti-static continuity test (metal seal <10Ω). (11) Fire-safe component verification (graphite packing, metal gasket, metal backup). (12) NACE hardness/chemistry verification (if NACE). (13) High-temperature test (if specified) - seal test at elevated temp. (14) API 607 fire test (if specified). (15) Thermal cycling test (if specified). Certification: ISO 9001:2015, CE (PED 2014/68/EU), API 607 (fire-safe, optional), NACE MR0175 / ISO 15156 (anti-sulfur, optional, 316L), ATEX (explosion-proof actuator, optional). Size: DN15–DN300 (1/2"–10"), customizable up to DN800. Pressure: PN16–PN100 (ANSI Class 150–900), customizable up to 100MPa. Temperature: -40°C ~ 1200°C (depends on material/seal/coating - conventional -40~550°C, special high-temp model to 1200°C with 2520 + all-metal seal). Body material: 304, 316L (NACE MR0175), 310S, 2520 Stainless Steel (customizable per working condition). Ball material: Stainless Steel, Stellite 6 (Co-Cr overlay), HVOF-sprayed WC (tungsten carbide) coating. Stem material: Stainless steel, nitrided (case-hardened), blow-out proof. Valve seat material: PTFE (≤180°C), PEEK (≤250°C), Graphite, Metal (Tungsten Carbide / Stellite Alloy for high-temperature), elastic metal seal. Sealing type: Soft Seal (PTFE/PEEK), Hard Seal (Metal, elastic metal + all-metal), Compound Seal. Stem packing: Flexible graphite (high-temp/fire-safe), PTFE (≤180°C, low-temp option). Gasket: Metal wound (spiral-wound stainless+graphite, high-temp), PTFE (low-temp). Ball coating: ENP (electroless nickel, optional), Stellite 6 overlay, HVOF WC coating. Leakage rate: Soft Seal ≤0.1ppm; Hard Seal ≤ISO 5208 Class VI / <0.001% ANSI. Anti-static: Standard (metal-to-metal continuity for hard seal; spring-loaded for soft seal). Blowout-proof stem: Yes (nitrided, bottom-retained). Fire-safe: API 607 optional (graphite packing + metal wound gasket + metal backup, 30-min fire containment). NACE anti-sulfur: NACE MR0175 / ISO 15156 optional (316L body + NACE trim). Extended bonnet: Optional (for >300-400°C, protects packing/actuator); cooling fins optional (>600°C). Thermal isolation bracket: Optional (for pneumatic/electric at high temp). Port: Full Port (standard) / Reduced Port (optional). Connection: Flange (ANSI B16.5, DIN 2543), Thread (NPT, BSPT), Butt Weld (BW), Socket Weld (SW). Operation: Manual (handwheel/worm gear), Pneumatic (fast response, ATEX explosion-proof), Electric (4-20mA signal, explosion-proof optional, DCS/PLC remote). Applicable medium: Steam, Thermal Oil, High-Temperature Gas, Corrosive Chemicals, Sulfide Media, Furnace Gas, Cracking Gas. Application: Petrochemical (catalytic cracking/ethylene/hydrogenation), Power (supercritical/nuclear 620°C/25MPa), Metallurgy (1200°C furnace gas), Building Materials (glass/ceramic kilns), Pharmaceutical/Food/Aerospace, Oil & Gas Sour. Service life: depends on temp/medium/cycling - metal seal high-temp valves require periodic seat/coating maintenance; with proper maintenance (warm-up, inspection, seat re-lap), 5-15+ years (longer at lower temp, shorter at >1000°C/abrasive). Installation orientation: Any orientation (flange/weld/thread); for high-temp, stem preferably vertical/up (packing lasts longer). Spare parts: Ball (matched with seat), seat kit (soft/metal), stem, packing (graphite), gasket (metal wound), seat retainer, handle, actuator repair kit, extended bonnet, thermal isolation bracket. Warranty: 18 months from shipment or 12 months from installation (valve body); pneumatic/electric actuator 12 months; note: high-temp wear items (seats, packing, coating) are subject to normal wear - warranty covers manufacturing defects, not normal high-temp degradation. MOQ: 1 piece standard. Lead time: standard 25-45 days; custom (310S/2520, high-temp model, DN>300, NACE, fire test, actuator, extended bonnet) 40-60 days. Payment: T/T 30% deposit + 70% before shipment, L/C at sight. FOB: Shanghai/Ningbo. OEM/ODM: private labeling, custom materials (Inconel, Hastelloy, duplex), custom pressure/temp, custom seal/coating, actuation, explosion-proof, fire-safe, NACE, extended bonnet/cooling, special high-temp coating (ceramic), special end connection. Documentation shipped: hydrostatic test report, material certificate (MTC 3.1), NDT report, PMI report, ball coating report (thickness/adhesion/hardness), nitride report, seat lap contact report, NACE/fire/high-temp test report (if applicable), warm-up/cool-down procedure, thermal expansion guidance, installation/operation/maintenance manual. Please provide size, pressure, medium (composition, H2S, particles), temperature (max continuous, min, cycling), body material, seal type, connection, actuation, NACE/fire-safe/extended bonnet options when requesting a quotation.

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