Reduced Port Flange Welded Ball Valve | Full Welded Zero Leakage

A Reduction Diameter Flange Welding Ball Valve (also known as Reduced Port Flange Welded Ball Valve or Full-Welded Reduced-Bore Ball Valve) is a quarter-turn (90° rotation) shut-off valve with a reduced-diameter (reduced-port) ball and an integrated fully-welded steel body with flange-welded ends, specifically designed for long-distance transmission, district heating, natural gas, oil, and water supply pipelines - especially buried and insulated pipeline systems where zero external leakage, lightweight construction, and maintenance-free operation are critical requirements. Unlike conventional cast-body flanged ball valves which have a two-piece or three-piece bolted body with potential external leakage points at the body-body joints and flange gaskets, this valve uses an integrated fully-welded body manufactured from A105 forged steel or seamless steel pipe - the body sections are welded together (typically by automatic submerged-arc or TIG welding) and 100% non-destructively tested (RT/UT), eliminating all body joints and external leakage paths, providing superior pressure resistance, corrosion resistance, and structural integrity for high-pressure and buried service. The flange ends are also welded to the valve body (flange-weld connection), rather than being integrally cast - this allows the flange to be made from a different material if needed, provides a stronger flange-to-body joint than casting, and simplifies replacement of damaged flanges. The reduced-diameter (reduced-port) design means the ball bore and valve flow passage are smaller than the nominal pipe diameter (typically the valve bore is ≥80% of the pipe bore, per standard reduced-port definition) - this reduces the valve volume and weight by approximately 30% compared to a full-bore ball valve of the same pipe size, lowers material cost, reduces pipeline load and support requirements, and still provides adequate flow capacity because when the valve bore is ≥80% of the pipe bore, the impact on pipeline flow capacity is minimal (flow resistance is only about 1/7 that of a globe valve of the same nominal size). The valve uses a spherical ball (hollow for DN15–DN32, solid for DN40–DN200) made of stainless steel 304L/316L, precision-polished for low torque and good sealing, rotating 90° between fully open (ball bore aligned with pipeline) and fully closed (solid ball blocking flow). The seat is carbon-fiber reinforced PTFE (or RTFE, Viton, Nylon, PEEK) with a preloaded spring - providing bidirectional zero leakage (Class A) even at low pressure and low temperature, with low operating torque. The valve stem is stainless steel 420 / 2Cr13 with anti-blowout design (the stem cannot be blown out by line pressure even if the packing fails), and the stem bearing is self-lubricating - eliminating the need for frequent lubrication and maintenance. The valve is designed for truly maintenance-free operation - no adjustment, no lubrication, no external leakage - with a service life matching the pipeline system (typically 20–30 years for buried gas/heating pipelines).

The valve is available in manual operation with a 180° adjustable handle (the handle can be mounted at any angle around the stem, adapting to limited installation space), gear operation (vertical or horizontal gearbox for large sizes DN300+ where manual torque is too high), or electric actuation (optional, for remote control and automation). The exterior surface is treated with eco-friendly anti-corrosion coating, high-temperature resistant spray paint, or epoxy coating - providing excellent corrosion protection for buried, underground, outdoor, and insulated pipeline service, and the smooth cylindrical body shape is easy to wrap with thermal insulation (for district heating and hot oil pipelines). With sizes from DN15 to DN1400 (NPS 1/2" to 56"), pressures from PN16 to PN420 (Class 150 to 2500), and temperatures from -29°C to 200°C, this valve covers a very wide range of small-to-very-large bore, low-to-ultra-high pressure applications - note: it is NOT suitable for steam service due to the PTFE-based seat temperature limit and the full-welded body design which is not intended for high-temperature steam cycling. Connection options include flange-weld (per GB/T 985.1/2, ANSI B16.5, DIN) and butt weld (per ANSI B16.25) - the flange-weld connection is the standard for this valve type, providing the tightness of a flange joint with the strength of a welded body-to-flange connection. Applicable media include water, hot water, natural gas, LNG/LPG, oil, chemicals, and air - it is especially widely used in natural gas long-distance transmission and city gas distribution (where zero external leakage is mandatory for safety), district heating networks (where buried insulated installation and maintenance-free operation are required), petroleum pipelines, chemical raw material transportation, urban water supply and drainage, industrial circulating water, shipbuilding, steel plants, power plants, and underground pipeline projects. Designed per GB/T 37827 (Chinese national standard for fully-welded ball valves), API 6D, ANSI B16.34, DIN, and BS; tested per API 598 / GB/T 13927 (shell 1.5× rated, seat 1.1× rated) with 100% factory testing including hydrostatic shell test, seat leak test, and body weld NDE. Certified ISO 9001, ISO 14001, CE, GOST (for Russian/CIS market). Widely trusted by customers in more than 140 countries - providing lightweight, zero-leakage, maintenance-free, full-welded reduced-bore ball valve solutions for long-distance buried pipelines worldwide, with an 18-month warranty and OEM/ODM customization.

1.Full-Welded Body - Zero External Leakage

Integrated fully-welded body manufactured from A105 forged steel or seamless steel pipe - body sections welded by automatic submerged-arc/TIG welding, 100% RT/UT non-destructive tested. Eliminates all body-body bolted joints and external leakage paths that exist on two-piece/three-piece cast ball valves - zero external leakage, critical for natural gas, LPG, toxic, and buried pipeline service where external leakage is a safety hazard. Superior pressure resistance (up to PN420 / Class 2500), corrosion resistance, and structural integrity vs. cast bodies. Flange ends welded to body (flange-weld connection) - stronger than cast flange, allows material flexibility, simplifies flange replacement. The full-welded design is the industry standard for long-distance gas transmission and district heating buried pipelines.

2.Reduced-Port - 30% Lighter + Cost-Effective

Reduced-diameter (reduced-port) design - ball bore and flow passage smaller than nominal pipe diameter (≥80% of pipe bore per standard). Reduces valve volume and weight by ~30% vs. full-bore ball valve of same pipe size - lower material cost, easier transport/installation, less pipeline load and support requirement. When valve bore ≥80% of pipe bore, impact on pipeline flow capacity is minimal - flow resistance only ~1/7 of globe valve same size, energy-efficient. Ideal for pipelines where full-bore flow is not required (most transmission and distribution lines), providing significant cost savings without meaningful performance penalty. Full-bore version available on request for applications requiring maximum flow.

3.Bidirectional Zero-Leakage Sealing + Low Torque

Carbon-fiber reinforced PTFE seat (standard) - stronger wear resistance and better thermal stability than pure PTFE; optional RTFE (reinforced), Viton (FKM, oil/high-temp), Nylon (high-pressure), PEEK (high-temp/abrasive). Preloaded seat spring ensures tight sealing even at low pressure and low temperature, and compensates for seat wear. Bidirectional sealing - blocks flow from either direction, unlike unidirectional check valves. Sealing Class A (zero leakage) per API 598 / GB/T 13927. Precision-polished stainless steel ball (304L/316L) provides low friction and low operating torque. Hollow ball for DN15–DN32 (lightweight, low torque), solid ball for DN40–DN200 (strength for larger sizes). Note: PTFE-based seats limit temperature to 200°C - NOT for steam.

4.High-Strength Materials + Anti-Blowout Stem

Body: A105 forged steel / A216 WCB cast steel / ST37 / A106-B seamless pipe (standard carbon steel); stainless steel 304/316/316L optional for corrosive service. Ball: AISI 304L / 316L stainless, precision-polished, hollow (DN15–32) or solid (DN40–200). Stem: ASTM 420 / 2Cr13 stainless, hardened, anti-blowout design (stem retained from inside body, cannot be ejected by line pressure even if packing fails - safety critical for high-pressure gas). Self-lubricating stem bearing - no frequent lubrication needed. All materials certified with MTC EN 10204 3.1. High axial force resistance - suitable for buried pipelines where soil load and ground movement exert axial force on the valve.

5.Maintenance-Free + Buried/Insulation-Friendly

Designed for truly maintenance-free operation - no adjustment, no lubrication, no external leakage points, self-lubricating stem bearing, preloaded spring seat compensates for wear. Service life matches pipeline system (20–30 years for buried gas/heating). Smooth cylindrical full-welded body - easy to wrap with thermal insulation (no bolted body flanges or crevices to insulate around), ideal for district heating and hot oil insulated pipelines. Eco-friendly anti-corrosion / high-temperature / epoxy exterior coating - corrosion protection for buried, underground, outdoor, and wet service. 180° adjustable handle - can be mounted at any angle around stem, adapting to limited space in valve pits and buried installations. Greatly reduces total cost of ownership (TCO) vs. gate valves and butterfly valves requiring frequent maintenance.

6.Wide Range + Multiple Operation + Global Standards

DN15–DN1400 (1/2"–56") - small residential to very large transmission mains; PN16–PN420 (Class 150–2500) - low-pressure heating to ultra-high-pressure gas transmission; -29~200°C. Operation: manual (180° adjustable handle, standard for DN15–DN300), gear operated (vertical or horizontal gearbox, for DN300+ large sizes), electric actuated (optional, for remote/automated control). Connections: flange-weld (GB/T 985.1/2, ANSI B16.5, DIN) standard, butt weld (ANSI B16.25) optional. Designed per GB/T 37827 (full-welded ball valve standard), API 6D, ANSI B16.34, DIN, BS; tested per API 598 / GB/T 13927 (shell 1.5×, seat 1.1×), 100% body weld NDE (RT/UT). Certified ISO 9001, ISO 14001, CE, GOST. 18-month warranty. Every valve shipped with test report, material certificate, weld NDE report, and installation instructions.

A Reduction Diameter Flange Welding Ball Valve operates on the principle of a 90° rotating reduced-port ball inside a fully-welded steel body, with flange-welded ends for pipeline connection, to provide fully open or fully closed (on-off) shut-off - it is not designed for throttling or flow regulation. The valve consists of a fully-welded body (no bolted body joints), a reduced-diameter spherical ball, two seat rings (upstream and downstream) with preloaded springs, a stem connecting the actuator/handle to the ball, self-lubricating stem bearings, and packing for stem sealing. In the fully open position, the ball has been rotated 90° so its reduced-diameter through-hole is aligned with the pipeline flow direction - fluid flows through the ball bore with minimal obstruction. Because the bore is reduced (typically ≥80% of the pipe diameter), there is a slight contraction and expansion at the valve, but the flow resistance is still very low - approximately 1/7 that of a globe valve of the same nominal size - making it energy-efficient for transmission pipelines. In the fully closed position, the ball has been rotated 90° so the solid (non-perforated) side of the ball faces the pipeline flow - the ball is pressed against both the upstream and downstream seat rings by the line pressure and the preloaded seat springs, creating a bidirectional bubble-tight seal that blocks flow completely. The key design features that make this valve unique are: (1) Full-welded body - the body is not bolted together like conventional ball valves; instead, the body sections are welded and 100% NDE tested, eliminating all external leakage paths. This is critical for natural gas and buried pipelines because: (a) there are no body gaskets to degrade and leak over time, (b) the welded body can withstand higher pressure and external loads, (c) the smooth body is easy to insulate, (d) there are no bolts to loosen or corrode underground. (2) Reduced-port ball - the ball bore is smaller than the pipe bore, reducing weight and cost by ~30%. The ball is hollow for small sizes (DN15–DN32) to reduce weight and torque, and solid for larger sizes (DN40–DN200) for structural strength. (3) Flange-weld ends - the flanges are welded to the body rather than cast integrally. This provides a stronger joint, allows flange material optimization, and means the valve can be installed between flanged pipelines while still benefiting from the full-welded body design. (4) Preloaded spring seats - the carbon-fiber PTFE seat rings are backed by springs that provide a constant seating force, ensuring tight sealing even at low pressure (when line pressure alone is insufficient to push the ball against the seat) and compensating for minor seat wear over time. The carbon-fiber reinforcement in PTFE improves wear resistance and thermal stability vs. pure PTFE. (5) Anti-blowout stem - the stem is retained from inside the body (the stem has a larger diameter shoulder under the body bonnet area), so even if the stem packing fails completely, the line pressure cannot blow the stem out of the valve - a critical safety feature for high-pressure gas service. (6) Self-lubricating stem bearing - the stem rotates in a self-lubricating composite bearing (typically PTFE-impregnated bronze or carbon composite), eliminating the need for periodic lubrication and making the valve truly maintenance-free. The valve is operated by rotating the stem 90° - manual via a 180° adjustable handle (the handle can be repositioned around the stem to adapt to installation space), via a gearbox (vertical or horizontal orientation) for large sizes where manual torque exceeds comfortable limits, or via an electric actuator for remote/automated control. The valve must be installed with the ball bore aligned to the pipeline in the open position - the flow direction is bidirectional (no preferred inlet/outlet) because the seats are spring-loaded on both sides. The valve can be installed in any orientation (horizontal, vertical, inclined), though horizontal installation with stem upright is recommended for best handle/gear access and to prevent debris from entering the stem area. The valve is for on-off service only - operating it in a partially open position for extended periods will cause high-velocity fluid to erode the seat and ball edge, especially with the reduced-port design where velocity is higher at partial opening. The exterior coating (epoxy/anti-corrosion/high-temp paint) protects the carbon steel body from corrosion in buried and outdoor service - for buried installation, the valve is typically wrapped with additional corrosion protection (tape coating or heat-shrink sleeve) at the weld joints, and the entire valve may be pre-insulated for heating pipelines. The valve is not suitable for steam service because: (a) PTFE-based seats degrade above 200°C, (b) the full-welded body cannot be easily repaired if seat damage occurs from high-temperature cycling, (c) steam systems typically require valves that can be maintained inline, which is not possible with a full-welded body. For steam service, a cast-body flanged ball valve with metal seat or a gate valve should be used instead.

• Petroleum & Natural Gas

Long-distance oil and gas transmission pipelines, natural gas city distribution networks, gas pressure regulating and metering stations, LNG/LPG storage and transfer, oil refinery offsites - full-welded zero external leakage is mandatory for gas safety, PN16-420 covers gathering to transmission, reduced-port lightweight reduces pipeline load, epoxy coating for buried service, anti-blowout stem for high-pressure gas safety, GOST/CE certification for international gas projects.

• District Heating & Thermal

District heating hot water pipelines, thermal power plant heat exchange stations, primary and secondary heating networks, buried insulated pipelines - full-welded body easy to wrap with thermal insulation, maintenance-free design eliminates underground valve pit maintenance, carbon-fiber PTFE seat handles hot water to 200°C, reduced-port cost-effective for large heating mains, 180° adjustable handle fits small valve pits, anti-corrosion coating for buried service.

• Chemical & Petrochemical

Chemical raw material transportation pipelines, chemical reactor inlet/outlet, pharmaceutical factory process piping, corrosive fluid distribution - stainless steel 304/316 body option for corrosive chemicals, PEEK/Viton seat options for chemical compatibility, bidirectional zero leakage prevents cross-contamination, full-welded body eliminates gasket leakage for toxic/corrosive media, gear/electric operation for remote control in chemical plants.

• Water Supply & Drainage

Urban water supply and distribution mains, industrial circulating water systems, hot water pipelines, wastewater force mains, desalination intake/outfall - carbon steel body with epoxy coating for water service, reduced-port lightweight for large water mains, low flow resistance reduces pumping energy, full-welded zero leakage prevents water loss and ground contamination, manual/gear operation for pump station isolation, suitable for buried and underwater installation.

• Power, Shipbuilding & Steel

Thermal/hydropower plant circulating water and auxiliary systems, shipboard ballast and bilge pipelines, steel plant water and gas systems, underground pipeline projects, industrial compressed air - A105 forged body withstands axial force in buried/underground service, wide size DN15-1400 covers small auxiliary to large mains, multiple operation modes adapt to different plant layouts, ISO 9001/14001/CE certification meets industrial and marine requirements, maintenance-free reduces downtime in continuous-operation plants.

Our Reduction Diameter Flange Welding Ball Valves are manufactured under an ISO 9001:2015 and ISO 14001 certified quality management system, with every valve undergoing rigorous inspection and testing at each production stage - because these valves are often used in high-pressure natural gas and buried pipelines where failure is not acceptable.

Raw material control: every forging, seamless pipe, and casting batch comes with a mill test certificate (MTC EN 10204 3.1) verifying chemical composition and mechanical properties; A105 forged steel verified for tensile strength, yield strength, and impact toughness; seamless pipe verified for wall thickness, ovality, and straightness; stainless steel verified by PMI spectrometer to confirm 304/316/316L grade; ball and stem materials verified for grade and hardenability.

Body manufacturing & welding: A105 forged or seamless steel pipe body sections cut and machined to precise dimensions; flange-to-body and body-to-body welds performed by certified welders per qualified WPS/PQR (ASME BPVC Section IX / ISO 9606), using automatic submerged-arc welding (SAW) for circumferential body welds and TIG for root passes; all pressure-containing welds 100% visually inspected (VT), 100% penetrant tested (PT) for surface defects, and 100% radiographically tested (RT) or ultrasonically tested (UT) for volumetric defects per ASME BPVC Section V - weld quality is the most critical quality point for full-welded valves. Post-weld heat treatment (PWHT) performed for carbon steel bodies above specified thickness to relieve residual welding stress and prevent cold cracking.

Machining & assembly: dimensional inspection per GB/T 37827 / API 6D, flange dimensions per ANSI B16.5 / DIN, flange weld preparation per GB/T 985.1/2, ball sphericity and surface finish verified (Ra ≤0.2μm for polished ball), seat ring flatness and surface finish verified, reduced bore diameter verified (≥80% of nominal pipe bore per standard), stem dimensions and anti-blowout shoulder verified, stem bearing clearance verified for smooth rotation, seat spring preload force measured and recorded, ball-to-stem connection verified for 90° rotation accuracy, handle/gear mounting verified.

Ball & seat inspection: stainless steel ball inspected for surface defects (no pits, scratches, porosity), polishing quality verified by surface roughness tester, hollow ball (DN15-32) inspected for wall thickness uniformity, solid ball (DN40-200) verified for solidity; carbon-fiber PTFE/RTFE/Viton/Nylon/PEEK seats inspected for dimensional accuracy, surface defects, and material certification; seat spring inspected for spring force and fatigue.

Pressure testing: 100% hydrostatic shell test at 1.5× rated pressure per API 598 / GB/T 13927 - held for specified duration with zero visible leakage (including all weld seams); 100% seat leak test at 1.1× rated pressure - must achieve Class A zero leakage (no visible leakage) for both directions (bidirectional test); 100% operation test - valve must fully open and close smoothly with torque within specification, verify 90° rotation, verify handle/gear operation.

Coating inspection: exterior surface preparation verified (Sa 2.5 blast cleaning per ISO 8501-1), coating dry film thickness (DFT) measured (minimum 250μm for epoxy, 150μm for standard paint), coating adhesion tested (cross-cut test per ISO 2409), spark test for holiday detection on buried-service epoxy coating.

Marking & documentation: each valve permanently marked per API 6D / MSS SP-25 with material grade, pressure rating, size, reduced-bore designation, flow direction (bidirectional), welding standard, and standard; shipped with hydrostatic test report, material certificate (MTC 3.1), weld NDE report (RT/UT), welding procedure and welder qualification records, coating inspection report, and installation/maintenance instructions including handle adjustment and buried installation guidelines.

Warranty: 18 months from date of shipment or 12 months from installation, whichever comes first - free repair or replacement for any manufacturing defect; for buried gas pipeline projects, extended warranty and third-party inspection (BV, SGS, TUV) available on request.

Q: What is a reduced-port (reduced-diameter) ball valve and when should I use it?

A: A reduced-port (also called reduced-bore or reduction-diameter) ball valve has a ball bore and valve flow passage that is smaller than the nominal pipe diameter - typically the valve bore is at least 80% of the pipe bore (per standard reduced-port definition). This is in contrast to a full-port (full-bore) ball valve where the ball bore equals the pipe bore. Reduced-port valves are used when: (1) you want to reduce cost and weight - a reduced-port valve is approximately 30% lighter and 20–30% less expensive than a full-port valve of the same pipe size; (2) the pipeline does not require maximum flow capacity - for most transmission and distribution pipelines, a valve bore of ≥80% of pipe diameter has minimal impact on overall pipeline flow capacity (the pressure drop increase is typically less than 5%); (3) you want to reduce pipeline load - lighter valves reduce support and anchoring requirements, especially for buried and elevated pipelines. Full-port valves are used when: maximum flow is critical (e.g., pump suction, pigging pipelines, very low-pressure systems), or when pipeline pigs must pass through the valve (pigging requires full-port). For most gas transmission, district heating, water distribution, and general industrial applications, reduced-port is the standard and cost-effective choice. This valve is available in both reduced-port (standard) and full-port (optional) - please specify when ordering.

Q: What does "flange welding" connection mean?

A: "Flange welding" (flange-weld) connection means the pipe flanges are welded to the valve body, rather than being integrally cast with the body (as in conventional cast flanged ball valves). The valve body is a full-welded cylindrical steel structure, and a flat-faced or raised-face flange ring is welded onto each end of the body. This design provides several advantages: (1) the flange-to-body joint is a full-penetration weld that is stronger than a cast flange neck (which can be a failure point in cast valves); (2) the flange can be made from a different material than the body if needed (e.g., carbon steel body with stainless steel flange for corrosive flange face); (3) if a flange is damaged during installation, it can be cut off and replaced without replacing the entire valve; (4) the full-welded body has no body-body bolted joints, eliminating external leakage. The flange itself conforms to standard dimensions (ANSI B16.5, DIN, GB/T 9113) so it bolts directly to standard pipeline flanges with gaskets and bolts - the installation is the same as any flanged valve. This is different from a butt-weld (BW) connection where the valve end is directly welded to the pipe without flanges. Both flange-weld and butt-weld connections are available for this valve.

Q: Why is this valve not suitable for steam?

A: This full-welded reduced-port ball valve is NOT recommended for steam service for three reasons: (1) Seat temperature limit - the standard seat is carbon-fiber reinforced PTFE, which is limited to approximately 200°C. Saturated steam at common pressures (e.g., 10 bar = 184°C, 16 bar = 204°C, 25 bar = 225°C) meets or exceeds this limit, causing PTFE to creep, harden, and lose sealing ability. While PEEK or metal seats can handle higher temperatures, they are not standard for this valve type. (2) Full-welded body not maintainable - steam service causes more rapid seat and ball wear due to high velocity, condensate, and water hammer. With a full-welded body, you cannot open the valve inline to replace seats or ball - the entire valve must be cut out and replaced, which is costly and disruptive for steam systems that require periodic maintenance. Cast-body bolted ball valves or gate valves allow inline maintenance. (3) Thermal cycling - steam systems experience frequent thermal cycling (hot/cold) which can cause differential expansion between the ball, seat, and body, leading to seat leakage and potential body weld stress over time. For steam service, we recommend a cast-body flanged ball valve with metal/Stellite seat, a gate valve, or a globe valve designed for steam. This valve is ideal for water, hot water (≤200°C), natural gas, LNG/LPG, oil, chemicals, and air - not steam.

Q: How is the full-welded body tested for integrity?

A: The full-welded body is the most critical component of this valve, and it undergoes rigorous testing: (1) Welder and procedure qualification - all welders are certified per ASME BPVC Section IX or ISO 9606, and all welding procedures (WPS) are qualified by procedure qualification records (PQR) including tensile, bend, and impact tests of welded test coupons. (2) 100% Visual Testing (VT) - every weld is visually inspected for surface defects (cracks, porosity, incomplete fusion, undercut) per ASME BPVC Section V. (3) 100% Penetrant Testing (PT) - every weld surface is dye-penetrant tested to detect surface-breaking cracks and defects not visible to the naked eye. (4) 100% Radiographic Testing (RT) or Ultrasonic Testing (UT) - every circumferential body weld and flange weld is fully RT or UT examined to detect internal volumetric defects (porosity, slag inclusions, lack of fusion, cracks) per ASME BPVC Section V, with acceptance criteria per API 6D or ASME BPVC Section VIII. (5) Post-Weld Heat Treatment (PWHT) - carbon steel bodies above specified thickness undergo PWHT to relieve residual welding stress. (6) 100% Hydrostatic Shell Test - every completed valve is hydrostatically pressure-tested at 1.5× rated pressure, holding for the specified duration, with zero visible leakage at any weld seam or body location - this is the ultimate proof test of weld integrity. (7) For high-pressure gas service (PN100+), additional low-pressure air bubble test and helium leak test may be performed on request. Every valve comes with a weld NDE report (RT/UT results) and hydrostatic test report.

Q: What sizes, pressures, and operation modes are available?

A: Size range: DN15 to DN1400 (NPS 1/2" to 56") - from small residential/branch lines to very large transmission mains; custom sizes available. Pressure range: PN16 to PN420 (Class 150 to Class 2500) - from low-pressure district heating (PN16) to ultra-high-pressure gas transmission (PN420); note: reduced-port design is standard, full-port optional for sizes where full flow is required. Temperature range: -29°C to +200°C (PTFE-based seat; not for steam). Operation modes: (1) Manual with 180° adjustable handle - standard for DN15–DN300, handle can be mounted at any angle around the stem to adapt to limited space; (2) Gear operated - vertical or horizontal gearbox for DN300+ large sizes where manual operating torque exceeds comfortable limits (typically >300 N·m); (3) Electric actuated - optional quarter-turn electric actuator for remote control, automation, and DCS/PLC integration (on-off type, not modulating). Connection: flange-weld (standard, ANSI B16.5 / DIN / GB/T 9113) or butt weld (ANSI B16.25, optional). Body material: A105 forged / WCB cast / ST37 / A106-B seamless carbon steel (standard); stainless steel 304/316/316L (optional, corrosive service). Please provide size, pressure, medium, temperature, connection, and operation mode when requesting a quotation.

Q: What is the warranty, MOQ, and lead time?

A: Warranty is 18 months from shipment or 12 months from installation, whichever comes first - free repair or replacement for manufacturing defects in the valve body, welds, and seats; electric actuator covered under manufacturer warranty (typically 12 months). For buried gas pipeline and district heating EPC projects, extended warranty (24–36 months) and third-party inspection (BV, SGS, TUV, Lloyd's) available on request. MOQ is 1 piece for standard carbon steel flange-weld manual models in common sizes (DN50–DN300); stainless steel body, large-bore (DN500+), high-pressure (PN100+), gear/electric operated, and butt-weld end orders require minimum 1–2 pieces and project-based quotation. Standard models (carbon steel, DN15–DN300, manual, flange-weld) lead time: 20–35 days; stainless steel, large-bore, high-pressure, gear/electric, butt-weld, or custom: 35–60 days. Payment: T/T 30% deposit + 70% before shipment, or L/C at sight (common for gas pipeline projects). FOB Shanghai/Ningbo. OEM/ODM and private labeling available - we can supply with your brand nameplate, color, and certification marking. We provide spare parts kits (seat ring set, ball, stem, stem packing, bearings) and can provide on-site installation supervision, weld procedure support, and commissioning for large pipeline projects. For GOST-certified orders (Russian/CIS market), please allow additional lead time for certification.

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