High Temperature and Pressure Electric Power Station Gate Valve Self-Sealing Welded Gate Valve

Specification

Execution standards	APL, JIS, DIN, BS, ASTM, ANSI, GB, JB, NB, HG
Pressure range	Class150~Class2500Lb(PN16-PN420)
Size range	NPS1/2 “to NPS72” (DN15mm to DN1800mm)
Material scope Forgings	A105,F91.F11.F22,F5a, F6, LF1LC2,12Cr1MoV F36 F304.F316. F321H
Material scope Castings	WCB, LCB, LCC,WB36, WC6, C5, WC9, C12A,20CrMOV,CF8,CF8M,4A,5A,6
0perate Type	Manual, electric,pneumatic, gear
Valve type	Power station valves, gate valves, globe valves, checkvalves
Application	power plants,petrochemicals,refining, natural gasmetallurgy
Connection type	Flange, welding, thread, FM, BW, SW
Customization	OEM/ODM/OSM/OBM

Product Overview

High-Temperature and High-Pressure Power Station Gate Valve: TIANYU Self-Sealing Welded Gate Valve Professional Solution

I. Product Overview: Core Fluid Control Equipment for Harsh Conditions

TIANYU’s high-temperature and high-pressure power station gate valves are designed for extreme conditions in power, petrochemical, and metallurgy industries. Featuring a self-sealing welded structure, they use medium pressure for dynamic sealing, eliminating leakage risks from traditional flange connections. Constructed from high-strength materials like A105 forged carbon steel, F91 alloy, and WC6 cast steel, these valves operate stably between -29℃~540℃ and PN16~PN420, suitable for intercepting and regulating water, steam, oil-gas, and acid-base media. Their core advantage lies in the reliability of self-sealing technology and welded connections, meeting safety requirements for critical scenarios like supercritical units and high-pressure hydrogenation plants.

II. Key Attribute Parameters: Comprehensive Technical Specifications

Parameter Category	Technical Indicators
Nominal Diameter Range	NPS1/2″~NPS72″ (DN15~DN1800), covering micro to extra-large pipeline systems
Pressure Class	Class150~Class2500 (PN16~PN420), suitable for low to ultra-high pressure conditions
Execution Standards	API, JIS, DIN, BS, ASTM, ANSI, GB, etc., ensuring global project compatibility
Material System	– Forgings: A105, F91, F11, F22, 12Cr1MoV, F304/316 stainless steel, etc.; – Castings: WCB, WC6, WC9, CF8M, 20CrMoV, etc.
Operation Modes	Manual, electric, pneumatic, gear-driven, supporting DCS integration and on-site emergency operation
Connection Types	Butt Weld (BW), Flanged (RF/RTJ), Threaded, Socket Weld (SW), compliant with ANSI B16.25 welding standards
Temperature Range	Carbon steel ≤425℃, alloy steel ≤540℃, stainless steel ≤200℃

III. Core Features: Self-Sealing Technology & Condition Adaptability

Advantages of Self-Sealing Structure
The bonnet adopts a wedge-type self-sealing design, using medium pressure to push the gasket for dynamic compression—higher pressure enhances sealing reliability. Test data shows that under PN420 high pressure, the self-sealing structure has a leakage rate 90% lower than traditional flanges, reducing maintenance by eliminating frequent bolt tightening.
Wide-Range Condition Adaptability

Temperature Resistance: Material selection (e.g., F91 alloy) suits supercritical steam (540℃), while extended stems enable LNG cryogenic (-196℃) applications;
Medium Compatibility: Stellite-alloy hardfaced sealing surfaces resist erosion, suitable for complex media like particle-laden steam and high-viscosity oil.

Multi-Standard Compatibility & Welding Reliability
Valve face-to-face dimensions comply with ANSI B16.10 and JIS B2002; welding ends follow ANSI B16.25 groove requirements. RT radiography ensures weld quality, making them suitable for SHA-class high-pressure pipeline systems.

IV. Manufacturing Processes: Precision Control from Material to Finished Product

Raw Material Selection & Pretreatment
Forgings use electroslag remelting to control S/P content below 0.02%, inspected by ultrasonic testing (UT); castings adopt resin sand precision casting, annealed to eliminate internal stress, with material certificates tracing furnace numbers and mechanical property reports.
Precision Machining & Sealing Surface Treatment

Valve body sealing surfaces are machined by 5-axis CNC grinders with flatness error ≤0.01mm and roughness Ra≤0.8μm;
Sealing surfaces use automatic plasma surfacing for Stellite alloy layers ≥3mm thick, hardness-tested (HRC58~62) for wear resistance.

Full-Process Quality Control

Pressure Testing: Each valve undergoes 1.5x design pressure shell strength testing (30-min hold) and 1.1x pressure sealing testing (15-min hold);
Nondestructive Testing: 100% RT radiography for welds (Grade II qualified), 100% MT magnetic particle inspection for sealing surfaces to ensure defect-free delivery;
Life Testing: Sampling for 5,000 on-off cycles to ensure sealing performance meets 20-year design life requirements for power stations.

Valve Details

V. Product Advantages: Core Competitiveness in Industrial Applications

High-Reliability Sealing Performance
In a 600MW power station main steam pipeline project, the valve operated leak-free for 10 years, exceeding the industry average replacement cycle (5~7 years) and reducing maintenance costs by 30%.
Customized Solution Capabilities

Material Customization: Sulfur-resistant materials (e.g., LC2) with H2S stress corrosion testing for sour gas scenarios;
Functional Integration: Electric actuators and smart positioners with 4~20mA feedback for power station DCS systems;
Structural Optimization: Seismic-designed valve bodies for nuclear plants, passing 1.5x earthquake load tests per GB 50267.

Full-Cycle Service Support

Delivery Capability: Standard models within 7 days; phased production for DN1000+ valves with negotiable lead times;
After-Sales Support: 1-year warranty, on-site training for overseas projects, 24/7 technical support.

Application

VI. Application Fields: Solutions for Key Conditions in Multiple Industries

Power Industry: Supercritical unit main steam valves, boiler feedwater valves, turbine bypass intercept valves;
Petrochemical Industry: High-pressure feed valves for hydrocracking units, quench oil valves for ethylene cracking furnaces;
Metallurgy & Steel: Blast furnace gas pressure reducing valve groups, high-pressure cutoff valves for rolling mill hydraulic systems;
Energy Extraction: High-pressure intercept valves for shale gas gathering pipelines, offshore platform wellhead devices;
Nuclear Sector: Main steam valves for nuclear power plant secondary circuits, containment isolation valves (custom certification required).