Product Overview
High-Temperature and High-Pressure Large-Diameter Forged Gate Valve
I. Product Overview: Reliable Fluid Control for Extreme Conditions
High-Temperature and High-Pressure Large-Diameter Forged Gate Valve is designed for high-temperature and high-pressure conditions in power, petrochemical, and metallurgy industries. The valve body uses integral free forging with a forging ratio ≥5:1, combined with a pressure self-sealing structure that relies on medium pressure for dynamic sealing, eliminating leakage risks from traditional flange connections. Compliant with ASME B16.34 and API 600, it operates stably between -29℃~540℃ and Class 150~Class 2500, suitable for intercepting water, steam, oil, and natural gas. Core advantages lie in the high strength of forged bodies, reliability of self-sealing, and customized design for extreme conditions.
Specification
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Execution standards
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API, JIS, DIN, BS, ASTM, ANSI, GB, JB, NB, HG
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Pressure range
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Class150~Class2500Lb(PN16-PN420)
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Size range
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NPS1/2 “to NPS72” (DN15mm to DN1800mm)
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Material scope: Forgings
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A105, F91,F11,F22, F5a, F6, LF1,LC2,12Cr1MoV, F36, F304, F316, F321H
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Material scope: Castings
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WCB, LCB, LCC,WB36, WC6, C5, WC9, C12A, 20CrMOV, CF8, CF8M, 4A, 5A
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Operate Type
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Manual, electric,pneumatic, gear
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Valve type
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Power station valves, gate valves, globe valves, check valves
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Application
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power plants,petrochemicals,refining, natural gas, metallurgy
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Connection type
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Flange, welding, thread, FM, BW, SW
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Customization
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OEM/ODM/OSM/OBM
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II. Key Attribute Parameters: Comprehensive Technical Specifications
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Parameter Category
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Technical Indicators
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Nominal Diameter Range
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NPS 1/2″~NPS 48″ (DN15~DN1200), covering full-size needs from instrument lines to main steam pipes
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Pressure Class
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Class 150, 300, 600, 900, 1500, 2500 (PN16~PN420), adaptable to different pressure systems
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Execution Standards
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Design: ASME B16.34, API 600, BS 1873; Face-to-Face: ANSI B16.10; Welding: ANSI B16.25
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Material System
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– Body/bonnet: A105, F22, F91, WC6, WC9, CF8M, etc.;
– Sealing surface: Stellite alloy hardfacing (hardness ≥HRC58)
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Operation Modes
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Manual (with handwheel/gearbox), electric (explosion-proof optional), pneumatic, hydraulic, supporting remote control integration
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Connection Types
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Butt Weld (BW), Flanged (RF/RTJ), Threaded, compliant with ANSI B16.5 and other international standards
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Temperature Range
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Carbon steel ≤425℃, alloy steel ≤540℃, stainless steel ≤200℃, low-temperature steel (LCB) down to -196℃
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III. Core Features: Forging Process and Self-Sealing Technology Advantages
Advantages of Integral Free Forging Structure
The valve body adopts integral free forging with a forging ratio ≥5:1, featuring dense and uniform grain structure without casting defects. Compared to castings, tensile strength increases by 30%, impact toughness by 50%, and fatigue resistance by 2x, suitable for frequent start-stop conditions. Ultrasonic testing (UT) shows internal defect rate <0.1%, far exceeding industry standards (≤1%).
Innovative Pressure Self-Sealing Design
The bonnet-body wedge-type self-sealing structure increases sealing specific pressure with medium pressure. At Class 2500, sealing performance is 90% better than traditional flanges, eliminating regular bolt tightening and reducing maintenance. This structure also removes leakage risks from gasket aging, ideal for high-temperature steam and corrosive gases.
Wide-Condition Adaptability Design
Temperature Adaptation: Materials like F91 alloy suit supercritical steam (540℃), while low-temperature steel (LCB) works for LNG terminals (-196℃);
Pressure Fluctuation: The self-sealing structure automatically compensates for ±30% pressure changes, maintaining reliable sealing;
Medium Compatibility: Stellite-alloy hardfaced seals enhance erosion resistance 4x, suitable for particle-laden media (e.g., coal powder, catalysts).
