2 Inch - 36 Inch Metal Seated Check Valve H44 API 6D Work Automatically

Api Cast Steel Swing Check Valve Metal Seat Non Return Valves H44 Work Automatically

1. Standards

Design and manufacture: Cast steel check valve according to BS 1868, ASME B16.34 and API 6D;
Forged stee! check valve according to API 602.

Inspection and test: API 598 or API 6D.

End flange dimension: ASME B16.5 (for NPS≤24),ASME B16.47 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

Pressure-temperature ratings: ASME B16.34.

Shell wall thickness: API 600 and BS 1868.

2. The Features of Check Valve

Bolted Bonnet; Swing and Lift Disc; Metallic Seating Surfaces

3. Body and Bonnet Connection

Class150 〜Class900 check valves are usually bolted bonnet. Class 1500 ~ Class2500 check valves are usually pressure seal bonnet design.

4. Cover Gasket Style

Stainless steel + flexible graphite wounded gasket is used for Class150 and Class300 check valve; Stain less steel + flexible graphite wounded gasket is used for Class600 check valve, and metal gasket is also optional for Class600 check valve; The metal ring gasket is used for Class900 check valve; The pressure seal bonnet design is used for Class1500 ~ Class2500 check valve.

5. Seat

For carbon steel check valve, the seat is usually forged steel. The seat sealing surface may be spray-welded with hard alloy if specified by the customer. The renewable threaded seat is used for NPS≤10 check valves, and the welded type seat can be also optional if being requested by the customer. The welded type seat is used for NPS≥12 carbon steel check valves. For Stainless steel check valve, integrai seat is usually adopted, or it can be machined integrally after hard alloy welded. The threaded or welded type seat is also optional for stain less steel check valve if being requested by the customer.

6. Swing Check Valve Parts and Material List: