API Lift Check Valve
Design & manufacture: API 602
Testing inspection: API 598
Flanged end dimension: ASME B16.5,ASME B16.47A,ASME B16.47B,MSS SP-44,API 605
Socket-Welded end dimension: ASME B16.11
Threads end dimension: ASME B1.20.1
Butt-Welded end dimension: ASME B16.25
Pressure temperature ratings: ASME B16.34
描述
The features of check valve
Bolted Bonnet, Swing and lift disc; Metallic seating surfaces, Bolted cover and pressure seal cover swing and lift disc,Threaded or welded seat ring
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
Gasket
Stainless steel+ flexible graphite wounded gasket is used for Class 150 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 cheek valve; Pressurized seal design is used for Class1500-Class2500 check valves
Seat
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. Welded on seat is used of NPS 1/2-2 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-8 carbon steel cheek valves. For stainless steel check valve, integral seat is usually adopted, or to weld hard alloy direetly integrally. Threaded or welded on seat is also optional for stainless steel check valve if being requested by the customer.If the customers have any other request about the seat. please kindly advise before placing the order.
