- Contact Person: Mr. Joe Zhao
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Packaging: wooden case
Place of Origin: China
Supply Ability: 10000
API Swing Type Check Valve
A Swing Check Valve consists of a flap or disc which hangs down in the flow path. With flow in the forwards direction, the pressure of the fluid forces the disc to swing upwards, allowing flow through the valve. Reverse flow will cause the disc to shut against the seat and stop the fluid going back down the pipe. In the absence of flow, the weight of the flap is responsible for the closure of the valve.
Flanged Dimension : ASME B16.5
Face to face : API6D
Test & inspection : API 598 / API 6D
Materials: Carbon Steel, Forged Steel, Stainless Steel ,CF8, CF8M, CF3, CF3M
Working Pressure: PN10~PN40
Suitable Medium: Water, Natural Gas, Oil and some corrosive liquid
Piston Lift Disc, Full Bore Design
Renewable Seat Rings / Integral Seat Rings.
Spring Loading Disc
Stainless steel + flesible graphite wounded gasket is used for Class 150 and Class 300 check valve; Stainless steel + flexible graphite wounded gasket is used for Class 600 check valve, and joint gasket is also optional for Class 600 check valve; Ring joint gasket is used for Class900 check valve; Pressurized seal design is used for Class 1500~Class 2500 check valves
Body and Bonnet Connection
The body and bonnet of Class150~Class900 check valves are usually with studs and nuts. And the body and bonnet of Class1500~Class2500 check valves are usually of pressurized seal design.
For carbon steel check valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by the customer. Renewable threaded seat is used for NPS<10 check valves, and welded on seat can be also optional if being requested by the customer. Welded on seat is used for NPS>12 crbon steel gate valves. Forstainless steel check valve, integral seat is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for Stainless Steel Check Valve if being requested by the customer.