Pressure Seal bonnet Swing Check valve는 body와 bonnet사이에 gasket를 넣어 body의 내압에 의해 bonnet를 밀어 올려서 누설을 방지하는 고온고압 발전소에 가장 많이 사용되고 있다. Bolt로 체결하지 않는구조로 Top Flange가 없고 bolted bonnet 밸브보다 면간거리가 짧아 중량이 가볍고 주로 맞대기 용접으로 배관에 부착한다.Swing Check Valve의 용도는 유체의 역류방지가 목적이다.
The body-cover bolting conforms with ANSI B.1.1 The nuts are manufactured to conform with ANSI B18.2.2 Strain-hardened austentic stainless steel
Austenitic stainless steel used for bodies and bonnets offer excellent impact strength, minimize heat loss and protect against corrosion.
■ HINGE PIN
The hinge pin is insrted into the valve and held in position by plug. The larger size valves are provided with bolted flanges instead of plugs.
The arm material is identical to the body. Hinge bushing is provided in the larger valve sizes to minimize friction and eliminate seizing.
■ SEAT RING
The bottom seated type seat ring is screwed into the body. The seating surface is finished by lapping. The forged seat ring is heat-treated to deliver the best mechanical properties and required hardness.
The disc has a sufficient seating surface area which is ground and lapped to a mirror finish. It is of one-piece construction and is heat treated to deliver the required mechanical properties and hardness.
Stellite 6 for all medium and high pressure application prevents seizing and galling
Austenitic stainless steel used for bodies and bonnets offer excellent impact strength, minimize heat loss and protect against corrosion