Wafer Butterfly Swing Check Valve

The features of check valve
Bolted Bonnet; Swing and lift disc; metallic seating surfaces.

Body and Bonnet Connection
The body and bonnet of Class150~Class900 check valves are usually bolted bonnet design. And the Class1500~Class2500 check valves are usually of pressurized seal design.

Body-to-bonnet joint
Stainless steel + flexible graphite wounded gasket is used for Class 150 and Class 300 check valve. Stainless steel + flexible graphite wounded gasket is used for Class, and ring joint gasket is also optional for Class 600. Ring joint gasket is used for Class 900 check valve. Pressurized seal design is used for Class 1500~Class 2500 check valve.

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. Renewable threaded seat is used for NPS<10 check valve, and welded on seat can be also optional if being requested by the customer. Welded on seat is used for NPS>12 carbon steel check valves. For stainless steel check valve, intergral seat is usually adopted, or to weld hard alloy directly intergrally. Threaded or welded on seat is also optional for stainless steel check valve if being requested by the customer.