GOST Welded End WC9 High Temperature High Pressure Gate Valve

Product Overview

The GOST Welded End WC9 High Temperature High Pressure (HTHP) Gate Valve is a premium industrial valve engineered for extreme thermal and pressure conditions, fully compliant with Russian GOST standards (GOST 12815, GOST 12820, GOST 9544) and compatible with ASME Class 1500-2500 specifications. Constructed from ASTM A217 WC9 chrome molybdenum steel (2.25Cr-1Mo alloy), this valve features butt welded (BW) end connections for leak-proof integration into high-pressure pipelines, a pressure self-sealing bonnet, and an OS&Y (Outside Screw and Yoke) rising stem design. Rated for PN250-PN320 (25-32 MPa / 3626-4641 psi) and operating temperatures up to 570℃ (1058°F), it delivers tight shutoff (EN 12266-1 Class IV), minimal flow resistance (full-port design), and exceptional creep resistance/hydrogen corrosion resistance—critical for power generation and petrochemical HTHP systems. Widely trusted in thermal power plants, Russian-standard industrial projects, and Central Asian/Eastern European pipeline networks, it balances GOST compliance, WC9’s high-temperature performance, and welded connection reliability for critical steam, boiler feedwater, and hot oil applications.

Key Features & Advantages

1.GOST Standard Compliance for Russian Markets

Fully adheres to GOST 12815 (flanged/welded steel valves), GOST 12820 (valve dimensions), and GOST 9544 (valve testing) — the core Russian industrial standards for HTHP valves. Compatible with ПНАЭ (Russian nuclear power standards) and ASME Class 1500-2500, ensuring seamless integration into Russian, Central Asian, and Eastern European pipeline systems. Meets GOST 9544 leakage and pressure test requirements, guaranteeing compliance with local safety regulations for power plant and petrochemical applications.

2.WC9 Chrome Moly Steel (2.25Cr-1Mo) for HTHP Environments

Manufactured from ASTM A217 WC9 alloy steel — a 2.25% chromium, 1% molybdenum alloy optimized for high-temperature strength and creep resistance. Key properties: tensile strength ≥485 MPa, yield strength ≥275 MPa, hardness ≤241 HB, and continuous service temperature up to 570℃ (1058°F) (short-term peak 595℃). Superior to WC6 (1.25Cr-0.5Mo) in high-temperature durability, WC9 resists hydrogen corrosion, oxidation, and thermal fatigue — ideal for supercritical/subcritical power plant steam pipelines and high-temperature reactors.

3.Butt Welded (BW) End Connection for High-Pressure Reliability

Features ANSI B16.25/GOST 12815 butt welded ends (BW) — the preferred connection for HTHP pipelines (PN250+). Welded design eliminates flange leakage risks, ensures structural integrity under cyclic pressure/temperature loads, and is suitable for long-distance pipeline systems where maintenance access is limited. Optional socket welded (SW) ends available for smaller sizes (DN50-DN100).

4.PN250-PN320 (25-32 MPa) High-Pressure Rating

Rated for working pressures up to 32 MPa (4641 psi) at ambient temperature, with pressure-temperature ratings aligned to ASME B16.34 and GOST 12815. At 570℃ (1058°F), the valve retains a working pressure of 14.5 MPa (2103 psi) (PN250) and 18.6 MPa (2700 psi) (PN320), ensuring stable performance in boiler main steam, reheat steam, and high-pressure feedwater systems.

5.Pressure Self-Sealing Bonnet & Metal Hard Seal

Pressure self-sealing bonnet design — the higher the system pressure, the tighter the bonnet seal — eliminating leakage in HTHP conditions. Valve disc and seat are overlay-welded with Stellite 6 alloy (hardness HRC 48-62), providing exceptional wear, erosion, and high-temperature resistance. Metal-to-metal seal meets EN 12266-1 Class IV leakage standards, ensuring tight shutoff for steam and hot oil media.

6.OS&Y Rising Stem & Full-Port Design

Outside Screw and Yoke (OS&Y) rising stem keeps threads isolated from media, preventing corrosion and extending service life. Visible stem position provides clear open/closed indication for operational safety. Full-port flow channel minimizes pressure drop (Cv value optimized), reducing energy consumption for large-volume fluid transfer (e.g., power plant steam distribution).

7.Multiple Actuation Options for Versatility

Available in manual (handwheel), bevel gear (for large sizes DN300+), and electric (AC220V/380V, DC24V) actuation. Electric actuators feature IP67 protection, 4-20mA proportional control, and manual override — ideal for remote operation in power plant control systems. Bevel gear actuation reduces operating torque for large-bore valves (DN400-DN600).

Technical Specifications

Applications

•Thermal Power Plants: Main steam pipelines, reheat steam systems, boiler feedwater lines, turbine bypass systems (supercritical/subcritical units)

•Petrochemical Industry: High-temperature hydrogenation reactors, catalytic cracking units, hot oil pipelines, HTHP process lines

•Russian Standard Projects: Industrial pipelines in Russia, Kazakhstan, Belarus, and Eastern European countries (GOST-compliant infrastructure)

•Nuclear Power (Non-Radioactive): Auxiliary steam systems, feedwater pipelines (compatible with ПНАЭ standards)

•Metallurgy & Thermal Energy: High-temperature steam pipelines for steel mills, thermal heating networks

•Marine & Offshore: Russian offshore platform HTHP media lines (non-corrosive)

Why Choose Our GOST Welded WC9 HTHP Gate Valve?

✅ GOST Compliance for Russian Markets: Fully meets Russian industrial standards, eliminating import/installation barriers

✅ WC9 HTHP Performance: 2.25Cr-1Mo alloy resists creep, hydrogen corrosion, and 570℃ temperatures — ideal for power plants

✅ Welded Connection Reliability: Butt welded ends prevent leakage in high-pressure cyclic conditions

✅ Pressure Self-Sealing Bonnet: Ensures tight sealing as pressure increases, critical for HTHP safety

✅ Global Compatibility: Works with GOST and ASME systems, suitable for international projects

✅ Proven Power Plant Performance: Trusted in thermal power stations worldwide for steam/feedwater service

Order Information

•Minimum Order Quantity (MOQ): 1 Unit

•Lead Time: 25~40 Working Days (Standard Sizes); 40~60 Working Days (Customized/ Large-Bore Sizes)

•Payment Terms: T/T (30% Advance + 70% Against B/L Copy), L/C, Western Union

•Shipping Method: Sea Freight (FCL/LCL), Air Freight (Urgent Orders)

•Packaging: Anti-Corrosion Coating + Wooden Case + Steel Frame + GOST/Export Labeling

•After-Sales Service: 18-Month Warranty, Technical Support, Spare Parts Supply, On-Site Installation Guidance (Russian-Speaking Engineers Available)

•Certifications Provided: Material Test Certificate (EN 10204 3.1), GOST 9544 Test Report, ISO 9001 Certificate, GOST Compliance Certificate

Contact Our GOST Valve Experts for customized quotes, 2D/3D drawings, WC9 material certificates, or Russian-language technical documentation. We specialize in HTHP valves for Russian and Eurasian markets — let us tailor a solution for your power plant or industrial pipeline project.

What Is a Welded High Temperature High Pressure Gate Valve

A Welded High Temperature High Pressure Gate Valve is a heavy duty isolation valve designed for severe industrial environments involving elevated pressure and temperature. The valve uses a wedge gate that moves vertically to fully open or completely block the flow path with minimal resistance. Welded body or welded end construction improves structural strength and reduces leakage points. These valves are widely used in steam pipelines, power plants, refineries, and petrochemical processing systems.

Why the Welded High Temperature High Pressure Gate Valve Matters

This valve is important because it provides reliable shutoff and strong structural integrity under demanding operating conditions. High temperature and pressure can place intense stress on pipeline components, making welded construction valuable for maintaining leak tight performance. The valve protects critical equipment from unstable flow conditions and pressure related damage. Its robust design supports safe, continuous operation in industrial systems where reliability and durability are essential.

Common Product Types by Welded High Temperature High Pressure Gate Valve

Common product types include welded bonnet gate valves, pressure seal gate valves, and butt welded gate valves. Flexible wedge designs are often used to compensate for thermal expansion and improve sealing performance. Solid wedge versions are selected for stable operating conditions. Manual, electric, pneumatic, and bevel gear operated configurations are available. Different alloy steel and stainless steel materials can be chosen for specific temperature and corrosion requirements.

Key Advantages of Welded High Temperature High Pressure Gate Valve

The valve offers excellent resistance to pressure, heat, and thermal cycling. Welded construction reduces external leakage paths and improves overall system integrity. The full bore flow path minimizes pressure loss when fully open. Durable seating surfaces and heavy duty internal components provide reliable sealing and long service life. The valve is suitable for demanding applications requiring stable performance and reduced maintenance.

Welded High Temperature High Pressure Gate Valve Machine Structure and Core Stations

Manufacturing begins with forging or casting the body, bonnet, wedge, and stem from high strength materials. Core stations include heat treatment, CNC machining of sealing surfaces, guide slots, weld ends, and stem threads. Hardfacing may be applied to seats and wedge surfaces for improved wear resistance. Assembly stations install the wedge, stem, packing, and bonnet. Final operations include welding inspection, pressure testing, coating, marking, and packaging.