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Swing Check Valve

Product name: Swing Check Valve

It is usually appeared with Double flange swing check valve, an traditional check valve, has extremely widely application. It is simple and reliable, which means the technology is rather mature and stable, easy to repair.  API swing check valve and DIN swing check valve adopt different disc hanging structure.  

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Standard and scope:

 
Size: NPS  2"～36" DN50～DN900   
Pressure Rating: Class 150～2500 PN2.5~PN100              
Connection: Raised face, Butt weld, Ring joint face, Male face, Female face,Socket weld and so on
Material: Carbon steel , Stainless steel, ALLOY and so on
Design and Manufacture： ASME B16.34 and API 6D,BS EN 1868,DIN 3840
Inspection and Test：API 598 or API 6D, BS EN12569
End flange dimension：ASME B16.5（for NPS≤24）；ASME B 16.47 series B(our normal standard)、API 605 or ASME B16.47 series A、MSS SP-44（for NPS＞24; BS EN 1092-1
BW end dimension：ASME B16.25
Socket-weld dimension：ASME B16.11
End to end：ASME B16.10, BS EN 558-1, DIN 3202, ISO 5752
Pressure-temperature ratings：ASME B16.34
Wall thickness dimension：API 600 and BS 1868, API603

Design feature

Seat
For carbon steel swing check valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy required by the client. Renewable threaded seat is used for NPS≤8 check valves, and welded on seat can be also optional if being requested by the customer. Welded on seat is used for NPS ≥10 carbon steel gate valves. 

For stainless 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 required.


Body-To-Bonnet Joint: Gasket
Stainless steel + flexible graphite wounded gasket is used for Class150 and Class300 check valve; Stainless steel + flexible graphite wounded gasket is used for Class600 check valve, and joint gasket is also optional for Class600 check valve; Ring joint gasket is used for Class900 check valve; Pressure seal design is used for Class1500～Class2500 check valves.


Body and Bonnet Connection
The body and bonnet of Class150～Class900 check valves are usually connected with studs and nuts. And the body and bonnet of Class1500～Class2500 check valves are usually of pressure Seal design.

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