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High Pressure Butt Weld Self Sealing Gate Valve

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High Pressure Butt Weld Self-Sealing Gate Valve is a high-pressure butt weld self-sealing gate valve designed specifically for isolating media under ultra-high temperature and high-pressure conditions. The valve features an integrally forged body structure, and its butt weld (BW) connection enables full-welding integration with pipelines. Coupled with a pressure self-tightening bonnet design, it completely eliminates external leakage risks under high pressure. The gate and seat adopt a wedge or parallel double-gate design, delivering reliable sealing and low-torque operation, making it suitable for critical pipelines such as main steam systems, high-pressure feedwater systems, hydrogenation units, and catalytic cracking units. A variety of forged steel materials are available, covering a wide range of operating conditions from normal temperature to ultra-high temperature, and from non-corrosive to highly corrosive media. It supports manual or heavy-duty automated operation, meeting the strictest safety and performance requirements in the power, petrochemical, coal chemical and other industries.
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Design Features

  • Integral Forged Valve Body:Machined from solid forgings including A105N, F11, F22, F91, F92, F304, F316, etc. Featuring dense metal structure without casting defects, excellent mechanical properties, and significantly better creep resistance and fatigue resistance than castings. Suitable for high-pressure and alternating load conditions.

  • Butt Weld Connection (BW):Full-welded butt weld connection between valve body ends and pipelines, complying with ASME B16.25. No flange sealing faces or bolted connections, completely eliminating leakage risks at joints. Compact structure and high pressure-bearing capacity, ideal for critical high-pressure systems.

  • Pressure Self-Sealing Bonnet:Pressure self-sealing structure (wedge gasket, octagonal gasket or lens gasket) between bonnet and body. The higher the medium pressure, the more reliable the sealing. Adapts to thermal expansion and contraction cycles under high temperature and pressure, preventing thermal relaxation leakage. Compared with bolted flange bonnets, it significantly reduces external leakage risks and maintenance workload under high pressure.

  • Wedge Gate:Flexible or rigid wedge design, automatically compensates for sealing face wear, suitable for general high-pressure applications.

  • Parallel Double Discs:Spring preload between two gates enables bi-directional sealing, suitable for high-temperature and high-pressure steam and applications requiring tight shut-off.

  • Hardfaced Sealing Surfaces:Sealing faces of seats and gates are hardfaced with Stellite or other hard alloys, providing high temperature resistance, erosion resistance and wear resistance, extending service life.

  • Rising Stem Design:Stem rotation drives gate lifting. Non-rising stem is optional (stem stationary, gate lifting only), reducing packing wear and improving sealing reliability.

  • Top-Entry Bonnet Structure:Self-sealing connection between bonnet and body facilitates online maintenance of internal parts without removing the valve from the pipeline.

  • Extended Cooling Stem (Optional):Stem equipped with cooling section or extended design to reduce packing box temperature, protecting packing and actuators for ultra-high temperature service.

  • Fire-Safe Design:Compliant with API 6FA. Graphite packing and metal sealing structure maintain tightness in case of fire, preventing catastrophic leakage.

  • Blowout-Proof Stem:Top-entry blowout-proof stem design ensures operational safety under ultra-high pressure conditions.


Technical Specifications

  • Size Range: 2″ to 24″ (DN50 to DN600)

  • Pressure Class: 150LB ~ 2500LB (PN10 ~ PN420)

  • Temperature Range: -29℃ to +425℃

  • Body/Bonnet: ASTM A105N, A182 F11, F22, F91, F92, F304, F316, A350 LF2 (low-temperature steel)

  • Gate: A105N / F11 / F22 / F91 / F92 / F304 / F316 + Stellite hardfacing

  • Seat: A105N / F11 / F22 / F91 / F92 / F304 / F316 + Stellite hardfacing

  • Stem: F6a (410SS), F316, 17-4PH, Inconel 718 (high temperature & high strength)

  • Gasket: Soft iron, mild steel, stainless steel, Inconel (selected per temperature and pressure)

  • Packing: Flexible graphite, braided graphite with Inconel wire reinforcement (high temperature type)

  • Bolts/Nuts: ASTM A193 B7/B16/B8M / ASTM A194 2H/4/7/8M (high temperature alloy steel)

  • End Connection: Butt Weld (BW), conforming to ASME B16.25 / ASME B16.34

  • Operation: Manual (heavy-duty worm gear, standard), pneumatic, electric, hydraulic

  • Design Standard: ASME B16.34, API 600, API 602

  • Inspection Standard: API 598

  • Face-to-Face Dimension: ASME B16.10


Applications

  • Petrochemical Industry: Material switching and isolation in high-temperature and high-pressure units such as hydrocracking, hydrotreating and catalytic cracking.

  • Coal Chemical Industry: High-temperature and high-pressure black water, ash water and syngas systems in coal gasification, coal-to-liquid, coal-to-olefins plants.

  • Refining Industry: Reliable shut-off in high-temperature and high-pressure units such as delayed coking and residuum hydrotreating.

  • Industrial Steam Systems: Reliable isolation and control of high-temperature and high-pressure superheated steam and saturated steam.

  • General Industrial Applications: Reliable shut-off and flow control for high-temperature and high-pressure water, oil, gas and other media.


Advantages & Value

  • Ultra-High Pressure Zero External Leakage:Self-sealing bonnet combined with butt weld connection delivers tighter sealing with increasing pressure, completely eliminating external leakage under ultra-high pressure.

  • High-Temperature & High-Pressure Adaptability:Multiple forged steel materials (F11/F22/F91/F92) cover ultra-high temperature service up to 540℃~650℃, with excellent creep and fatigue resistance ensuring long-term safe operation.

  • Reliable Sealing Under Thermal Cycling:Self-sealing structure accommodates thermal expansion and contraction cycles, preventing thermal relaxation leakage and reducing bolt retightening maintenance.

  • Long-Lasting Sealing Faces:Stellite hardfaced seats resist high temperature and erosion, greatly extending service life in high-pressure steam service.

  • Easy Maintenance:Top-entry bonnet enables online maintenance without pipeline removal, minimizing system downtime.

  • Full Safety Compliance:API 600/602 design, fire-safe, blowout-proof, extended cooling stem and other features meet strict international safety standards for high-temperature, high-pressure and hazardous services.

  • Strong Automation Compatibility:ISO 5211 standard top flange directly mounts heavy-duty actuators, supporting remote control and intelligent upgrading for extreme high-temperature and high-pressure applications.

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