Electric Welding Globe Valve | Butt-Weld Motorized | Welded Bonnet | Forged Body | -40~570℃ | IP65/67

Electric Welding Globe Valve - motorized valve, intelligent multi-turn actuator + butt-weld ends + welded bonnet + forged body, precise on/off/flow regulation HP/HT remote systems. Butt-weld (ASME B16.25) directly into pipeline - no flange gasket leak, compact, high-integrity boundary to PN42MPa (Class 3500). Welded bonnet - no mid-flange joint, zero leakage HP/HT. Forged body (WCB/SS304/316/F22/F91), high strength, PN1.6–42MPa, -40~570℃. Seals PTFE/PPL/Stellite/graphite, zero leak. OS&Y stem, anti-blowout/anti-static, backseat. Actuator: 4-20mA/on-off, position feedback, torque/overheat protect, manual override, DCS/PLC, IP65/67, Exd opt. DN15–600, Class 150–3500. Media: water/steam/oil/gas/chemical. API 6D/600/B16.34, API 598. ISO 9001/CE. Oil&gas/petrochemical/power/metallurgy/pharma. 18-month warranty, OEM/ODM.

1. Butt-Weld Ends + Welded Bonnet - All-Welded Zero-Leak Pressure Boundary, PN42MPa (Class 3500): Two critical welded design elements eliminate all potential leakage paths: (a) Butt-weld ends (per ASME B16.25 / JB/T 12224) - valve ends prepared with standard weld bevels and directly butt-welded into the pipeline, creating a permanent, continuous, leak-free joint. Eliminates flange gaskets, bolt holes, and flange face damage - the #1 source of external leakage in flanged valves - and reduces overall valve length and weight. (b) Welded bonnet (integral welding structure) - bonnet welded to body rather than bolted with a mid-flange gasket, eliminating the mid-flange bolted joint (another common leakage point, especially under high pressure and thermal cycling). Result: a fully welded, gasket-free pressure boundary achieving zero external leakage even at PN42MPa (Class 3500) and 570℃ - ideal for hazardous, high-pressure, high-temperature media where leakage is unacceptable. Butt-weld connection also provides superior structural integrity for high-pressure piping and is standard for power plant steam lines and oil & gas transmission. The all-welded design trades in-line maintainability for maximum leak-tight integrity - specified in critical, long-service applications (10–20 years) where reliability is prioritized.

2. Forged Body - WCB/SS304/316/F22/F91, High Density/Strength, -40~570℃, No Casting Defects: Valve body manufactured by forging process - solid steel billets heated and hot-forged under high pressure, then machined to final dimensions. Forging eliminates internal casting defects (porosity, shrinkage, inclusions), refines grain structure, and aligns grain flow to component stress contours - resulting in high material density and excellent mechanical strength (tensile, yield, impact toughness) superior to cast bodies. Available materials: WCB carbon steel (general water/steam/oil), SS304/SS316/SS316L stainless (corrosive service), F22 (1.25Cr-0.5Mo alloy, high-temp to 570℃), F91 (9Cr-1Mo-V, high-temp/power plant); duplex/Inconel optional. Forged body withstands PN1.6–42MPa (Class 150–3500) and -40℃~570℃ - suitable for superheated steam pipelines, high-pressure chemical reactors, high-pressure oil & gas transmission. Forging ratio verified ≥3:1, grain flow examined, 100% ultrasonic testing (UT) for internal defects per ASTM A961. All materials supplied with MTR EN 10204 3.1 and heat-number traceability.

3. Intelligent Electric Actuator - 4-20mA/On-Off, Position Feedback ±1%, Torque/Overheat Protect, Manual Override, DCS/PLC: High-precision multi-turn electric actuator supporting both on/off control (dry-contact switch signal) and modulating control (4-20mA analog), with accurate flow regulation, fast response, real-time position feedback (±1% accuracy). Built-in safety: torque overload protection (stops motor if torque exceeds setpoint), motor overheat protection (thermal switch), electrical protection (phase-loss, over/under-voltage). Manual emergency handwheel override (with declutch mechanism) allows manual operation during power failure or actuator maintenance - ensuring valve can always be operated safely. DCS/PLC compatible via 4-20mA or digital bus (HART/Modbus/Foundation Fieldbus optional). Protection: IP65 standard, IP67 optional (outdoor/humid/dusty); explosion-proof Exd II BT4 or Exd IIC T6 optional (IEC 60079-1) for flammable/explosive environments (oil & gas, petrochemical). Voltage: AC220V, AC380V, DC24V customizable. Actuator mounted to yoke via standard ISO 5211 flange. Major brands (Rotork, Auma, Limitorque) or own brand per preference.

4. Dual Seal + Durable Materials - PTFE/PPL/Stellite/Graphite, Pressure/Temp Adaptable, Zero Leak: Valve seat uses dual sealing approach with selectable seal materials matched to application: PTFE (general chemical/corrosive, -40~200℃), PPL (modified polypropylene, high-temperature water/steam to 280℃), Stellite cobalt-chromium alloy (hardfaced metal-to-metal, high-temp/abrasive to 570℃), flexible graphite (high-temp/fire-safe backup). Seal materials have strong adaptability to pressure and temperature changes, ensuring long-term reliable sealing and zero leakage. Valve stem integral-forged, precision-ground (Ra ≤0.8μm), surface treated with nitriding (case depth 0.1–0.3mm, HV≥600) or hard chrome plating (0.02–0.05mm, HV≥800) - reducing wear, galling, corrosion, extending service life. Valve disc/plug SS304/316/410/F22/F91 with Stellite 6/21 overlay (PTA process, HRC 40–45, 100% dye penetrant PT inspection). Body materials customizable per medium - from standard WCB to high-alloy F91 and duplex for severe corrosive/erosive service.

5. Safety Design - OS&Y Stem Anti-Blowout, Anti-Static ≤10Ω, Backseat Online Packing, Compact Boltless: Multiple safety features: (a) Stem anti-blowout (anti-flying) shoulder - stem designed with shoulder preventing ejection from bonnet under internal pressure even if yoke/packing fails - critical for high-pressure valves, verified to withstand 1.5× rated pressure. (b) Anti-static device - conductive path between stem, body, actuator dissipates static electricity, resistance ≤10Ω per API 607/BS 5351 - preventing spark ignition in flammable media (oil, gas, solvents). (c) Backseat - when valve fully open, stem backseat engages with bonnet, isolating packing from process pressure, allowing online packing replacement (gland repacking) without shutdown - valuable for continuous-process plants. (d) Butt-weld connection directly welded to pipeline, high connection strength, reduced installation space vs flanged - compact boltless body fits tight piping runs. (e) Removable sealing ring - easy to replace without removing valve from pipeline (after depressurization), reducing maintenance downtime. These ensure safe, stable operation in hazardous and high-pressure environments.

6. Global Standards + Wide Range - API 6D/600/B16.34, DN15–600, Class 150–3500, ISO 9001/CE, Multi-Industry: Strictly manufactured per API 6D (pipeline valves), API 600 (steel gate/globe), GB/T 12237, ASME B16.34 (pressure-temp rating), BS 5352 (forged small-bore), with complete inspection/testing - shell hydrostatic 1.5× rated, seat 1.1× rated, functional/actuator testing per API 598 / GB/T 13927. Sizes DN15–DN600 (1/2"–24"), pressures Class 150–Class 3500, temperatures -40℃~570℃ - wide industrial range. Applicable media: water, steam, oil, natural gas, chemicals, corrosive media. Certified ISO 9001, CE (PED) optional, API 607 fire-safe optional. Food-grade materials and electro-polished interior optional for pharmaceutical/food clean pipeline (FDA/3-A/GMP). This wide configurability ensures compatibility with any global industrial piping design - oil & gas extraction/transmission/refining, petrochemical HP/HT process, thermal/nuclear power boiler feedwater/steam, metallurgy/mining smelting, water/municipal large-bore, pharmaceutical/food clean.

Electric Welding Globe Valve: forged S-body + butt-weld + welded bonnet, OS&Y stem, disc, seat, multi-turn actuator. Motor drives gears, rotates stem - rises/lowers, disc moves linearly. Opening: disc lifts, flow area increases. Closing: disc seats, PTFE/PPL/Stellite/graphite seal - soft + hard backup. Modulating: 4-20mA vs encoder, holds disc partial flow regulation. Torque/overheat protection stops on overload. Manual override (declutch) for power failure. All-welded boundary = near-zero external leak; stem packing, backseat at full open. Anti-blowout + anti-static. DN15–600, PN1.6–42MPa, -40~570℃. API 6D/600/B16.34, API 598.

Oil & Gas - Extraction/Gathering, Long-Distance Transmission, Refining, High-Pressure Sour Service: Used in oil extraction wellheads and gathering lines, natural gas long-distance transmission pipelines, refinery process piping, and high-pressure oil/gas transmission - especially suitable for harsh conditions such as sulfur-containing (sour) media and high-pressure transmission where flange leakage is unacceptable. Butt-weld provides leak-free joint for high-pressure gas; welded bonnet eliminates mid-flange leakage; explosion-proof electric actuator (Exd IIC T6) allows remote control in hazardous Class 1 Division 1 areas; anti-static and stem anti-blowout ensure safety with flammable hydrocarbons. NACE MR0175 optional for sour service.

Petrochemical & Chemical - Reaction Pipelines, Corrosive Media, HP/HT Process, Reactor/Distillation: Applied in chemical reaction pipelines, corrosive medium transmission, and high-temperature/high-pressure process pipelines (reactor outlets, distillation column bottoms, high-pressure separator lines) - ensuring safe stable operation. Forged F22/F91 alloy body handles high-temperature corrosive hydrocarbons; PPL/Stellite seals handle high-temperature process fluids; intelligent electric actuator with 4-20mA modulating control provides precise flow regulation for process optimization; DCS/PLC integration enables automated plant operation. Zero-leakage all-welded boundary prevents toxic/expensive chemical loss and environmental contamination.

Power Generation - Thermal/Nuclear Boiler Feedwater, Main Steam, Turbine Extraction, Cooling Water: Used in thermal power plants and nuclear power plants for boiler feedwater regulation, main steam isolation and bypass, turbine extraction steam control, and cooling water pipelines - meeting high-precision control requirements. Butt-weld ends standard for high-pressure steam piping (ASME B31.1); forged F22/F91 body and Stellite/graphite seals handle superheated steam to 570℃; electric actuator with 4-20mA provides precise feedwater/steam flow regulation for boiler stability; manual override ensures operation during power outages. Fire-safe API 607 optional for power plant safety.

Metallurgy, Mining & Industrial - Smelting, Mineral Processing, High-Temp Flue Gas, Slurry/Water: Used in smelting process pipelines, mineral processing fluid control, high-temperature flue gas treatment pipelines, and slurry/water circuits - adapting to harsh environments such as high temperature, dust, and abrasive media. Forged WCB/alloy body with Stellite hardfaced seats resists erosion from particle-laden fluids; welded body withstands thermal cycling and mechanical vibration in steel mills; electric actuator allows remote control from control rooms, removing operators from high-temperature/dusty areas. PTFE/Stellite seals handle abrasive and high-temperature media.

Water, Municipal, Pharma & Food - Large-Bore Supply/Drainage, District Heating, Clean Pharma/Food Pipelines: Used in large-diameter water supply and drainage pipelines, sewage treatment systems, district heating pipelines, municipal water distribution - with long service life and low maintenance. WCB body with PTFE/EPDM seals provides cost-effective reliable service; electric actuator enables remote control and automated scheduling (night-time flushing, pressure management); butt-weld provides durable leak-free joint for buried/inaccessible piping. For pharmaceutical/food: clean pipeline systems with food-grade materials (SS316L body, PTFE/EPDM seals, electro-polished interior) optional to ensure product safety and FDA/3-A/GMP compliance; smooth forged body (no casting porosity) easier to clean/sanitize (CIP/SIP); zero-leakage welded connection prevents contamination ingress.

Every Electric Welding Globe Valve: Forging - forged, ≥3:1, UT. Material - WCB/SS304/316/F22/F91, MTR 3.1. Weld - bonnet weld ASME IX, 100% RT/UT, PWHT. Hardfacing - Stellite PTA, HRC40–45. Stem - forged, ground, nitrided/chrome, anti-blowout. Seal - PTFE/PPL/Stellite/graphite. Actuator - insulation ≥100MΩ, position ±1%, IP, Exd. Assembly - ISO 5211, stroke. Pressure - 100% shell 1.5×PN, seat 1.1×PN, zero leak API 598. Functional - electric cycle, ±1%, override. Anti-static ≤10Ω. Fire-safe API 607 (opt). Surface - CS epoxy, SS pickled. Marking - permanent material/size/serial. Lead: 25–45 days. Warranty: 18 months.

Q1: What is the difference between a welded-bonnet butt-weld globe valve and a standard bolted-bonnet flanged globe valve?

A: Three key differences: (1) Connection - butt-weld ends are permanently welded to the pipe (no flange, no gasket), while flanged ends use bolted flanges with gaskets. Butt-weld provides a leak-free, compact, high-integrity joint but is not removable; flanged is removable for maintenance but has gasket leakage points. (2) Bonnet - welded bonnet is permanently welded to the body (no mid-flange gasket), while bolted bonnet uses bolts and a spiral-wound gasket. Welded bonnet eliminates mid-flange leakage but cannot be disassembled in-line; bolted bonnet can be opened for internal inspection. (3) Application - welded-bonnet butt-weld valves are used in critical, high-pressure, high-temperature, hazardous service where zero leakage and long-term reliability are prioritized (power plant steam, high-pressure gas transmission, refinery reactors); bolted-bonnet flanged valves are used where in-line maintenance and removability are needed (general process, water, HVAC). The welded design trades maintainability for maximum leak-tight integrity.

Q2: Can the welded-bonnet valve be maintained or repaired in-line?

A: The welded bonnet means the valve body cannot be opened in-line for internal inspection or seat/disc replacement - the valve must be cut out of the pipeline (cut the butt-weld ends) for major internal overhaul. However, several maintenance tasks CAN be done in-line: (a) Packing replacement - with the valve fully open, the backseat engages to isolate the packing from process pressure, allowing the gland to be repacked online without shutdown. (b) Actuator replacement - the electric actuator can be unbolted from the yoke and replaced without disturbing the valve body or process. (c) External inspection - welds, body, and actuator can be inspected externally. (d) Lubrication - stem threads and actuator gears can be lubricated. For this reason, welded-bonnet valves are specified in applications where the valve is expected to operate for many years without internal maintenance (typically 10–20 years), and where the zero-leakage benefit outweighs the need for in-line internal repair. Install with enough space and pipe supports to allow future cut-out if needed.

Q3: What electric actuator options are available and how do I choose?

A: Actuator options: (1) Control type - On/off (switch signal, open or closed only, simplest, lowest cost) or Modulating (4-20mA, holds any position for flow regulation, for throttling service). Choose on/off for isolation/shut-off; choose modulating for flow/pressure regulation. (2) Voltage - AC220V (common), AC380V (industrial 3-phase, high torque), DC24V (intrinsically safe/solar/battery backup). (3) Protection - IP65 (standard, indoor/sheltered) or IP67 (outdoor, washdown, dusty). (4) Explosion-proof - Exd II BT4 (standard hazardous, Group IIB, T4) or Exd IIC T6 (severe hazardous including hydrogen/acetylene, T6 lower surface temp) - required for oil & gas, petrochemical, chemical. (5) Communication - standard 4-20mA + switch, or optional HART/Modbus/Foundation Fieldbus digital bus for advanced diagnostics. (6) Manual override - always included (handwheel with declutch) for power failure. Provide your control signal, voltage, environment, and required torque (based on valve size/pressure) for a recommendation. We can supply actuators from major brands (Rotork, Auma, Limitorque) or our own brand per your preference.

Q4: What sizes, pressures, temperatures, materials, and seals are available?

A: Sizes: DN15–DN600 (1/2"–24"). Pressure: PN1.6–PN42MPa (Class 150–Class 3500). Temperature: -40℃ to +570℃. Materials: Body - WCB carbon steel (general water/steam/oil, -29~425℃), SS304/SS316/SS316L stainless (corrosive, -196~450℃), F22 alloy steel (1.25Cr-0.5Mo, high-temp to 570℃, power/steam), F91 (9Cr-1Mo-V, ultra-high-temp, advanced power); duplex/Inconel optional. Seals - PTFE (chemical, -40~200℃), PPL (high-temp water/steam to 280℃), Stellite (metal hard seal, to 570℃), flexible graphite (high-temp/fire-safe backup). Connection - butt-weld only (ASME B16.25 / JB/T 12224); flanged version available as separate product if needed. Stem - integral-forged, precision-ground, nitrided or hard chrome plated, anti-blowout shoulder, anti-static. Custom sizes, pressures, materials, and special alloys available on request. The forged construction allows higher pressure ratings (up to Class 3500) than equivalent cast valves.

Q5: How is the welded bonnet tested for integrity, and what are installation/commissioning requirements?

A: Welded bonnet testing: (1) Weld procedure - ASME IX / ISO 9606 qualified welders using approved WPS with matching filler; (2) Pre-heat and PWHT - for alloy steel (F22/F91), weld pre-heated and stress-relieved per ASME B31.1 / ASTM A335; (3) NDE - 100% radiographic testing (RT) per ASME V Article 2, or ultrasonic testing (UT), no cracks/incomplete fusion/porosity exceeding limits; (4) Hydrostatic shell test - entire valve including welded bonnet joint tested at 1.5× rated pressure, weld visually inspected for weeping; (5) Additional helium mass spectrometer leak test on request. Installation: weld butt-weld ends per ASME B16.25 with qualified welder, support valve near both ends (not by actuator), install with flow direction arrow (unidirectional, flow under disc), protect actuator from weld spatter/heat (heat shield, valve closed during welding), ensure space for handwheel/actuator removal. Commissioning: after welding/line hydrotest, stroke test valve electrically, calibrate limit/torque switches and 4-20mA position feedback, test modulating at 25/50/75% (±1%), verify manual override, check packing leakage after first thermal cycle (re-torque if needed, do not over-tighten), set torque limit to 1.2–1.5× seating torque. Lead time: 25–45 days standard; custom 40–60 days. Warranty: 18 months from shipment. MOQ: 1 piece.

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