Forged Piston Check Valve Description
Forged piston check valve (i.e. lifting check valve) is a high-pressure one-way valve manufactured by forging technology. Its technical specifications strictly follow the American standard system and are suitable for harsh working conditions.
Structure:
Forging process
The valve body, valve cover and other pressure-bearing parts are formed by forging to eliminate the pore defects of the casting, the metallographic structure is dense, and the mechanical strength is increased by 20%-30%.
Piston structure
Valve disc (piston): Slides up and down along the vertical center line of the valve body, and relies on self-weight + medium backflow pressure to seal when closed;
Guide sleeve: Precision-machined inner cavity guide structure to ensure the stability of the valve disc movement trajectory;
Sealing surface: Overlay welding cobalt-based cemented carbide (such as Stellite), hardness HRC ≥ 55, erosion and high temperature resistance;
Self-sealing valve cover: High-pressure working conditions (Class ≥ 600LB) use pressure self-tightening seal, the higher the internal pressure, the more reliable the seal.
Forged Piston Check Valve specification
Design and manufacturing
Core standards: API 6D (pipeline valves), API 602 (forged steel valves);
Structural length: ANSI B16.10;
Connecting flange: ANSI B16.5 (RF/FF flange face).
Material and pressure
Main body material: ASTM A105 (carbon steel), ASTM A182 F22/F91 (alloy steel);
Pressure level: Class 150～2500LB;
Temperature range: -29℃～570℃ (high temperature alloy can reach 800℃).
Inspection requirements
Sealing test: API 598 (high pressure gas seal + liquid strength test);
Non-destructive testing: 100% UT/RT flaw detection of forgings, in accordance with ASME B16.34.
Forged Piston Check Valve in stock
Advantages
High-pressure reliability
Tensile strength of forgings ≥485MPa, pressure bearing capacity reaches Class 2500LB (42MPa);
Long-term sealing
Carbide sealing surface is resistant to particle erosion, and its service life is 3-5 times longer than that of ordinary valves;
Safety and leakage prevention
The self-sealing valve cover structure eliminates the risk of leakage of the middle flange;
Easy maintenance
The modular design supports online replacement of valve discs and sealing rings.
Applications
Energy and power
Turbine exhaust system (prevent steam backflow from causing overspeed accidents);
Boiler feed pump outlet (high-pressure pipeline above Class 1500LB).
Petrochemical
Crude oil high-pressure transmission pipeline (sulfur corrosion resistance, material F91/F22);
Hydrogenation reactor inlet and outlet (seal requirement ≤0.01% leakage rate).
High-end equipment
Deep-sea drilling platform hydraulic control system (resistant to 350Bar pulsating pressure);
Aerospace fuel filling system (-196℃ deep cold working condition).
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