GEP - Steel Check Valve

Standards

• Design and Manufacture: Cast steel check valve to BS 1868,
• ASME B16.34 and API 6D;
• Forged steel check valve to API 602.
• Inspection and Test API 598 or API 60.
• End flange dmension: ASME B16.5 (for NPS<24);
• ASME B 16.47 series B API 605 or ASME B16.47
• series A MSS SP-44 (for NPS>24).
• BW end dimension ASME B16.25.
• Socket weld dimension ASME B16.11.
• Face to face and end to end ASME B16.10.
• Pressure-temperature ratings ASME B16.34.
• Wall thickness dimension API 600 and BS 1868.

Seat
For carbon steel check valve, the seat is usually forged teel. The sealing surface of the seat is spray welded with hard alloy Specified by the customer.

Renewable threaded seat is used for NPS^IO check valves, and welded on seat can be also optional if being requested by the customer.

Welded on seat is used for NPS >12 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 being requested by the customer.

The features of check valve

• Bolted Bonnet; Swing and lift disc; Metallic soating surfaces.

Body-To-Bonnet Joint
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 abo optional for Class600 check valve; Rmg joint gasket is used for Class900 check valve; Pressure seal design is used for Class 150O~Class25O0 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 Classl 5O0~Class25O0 check valves are usually of pressure seal design.