Swing Check Valve의 용도는 유체의 역류방지가 목적이다.유체가 한방향으로만 흐를수 있는 구조이다. 유체압력이 낮을 경우 Chattering현상이 발생한다.역류시 Water Hammer현상이 발생하는 경우도 있으므로 배관설계가 중요하다.
The body-cover bolting conforms with ANSI B.1,1 The nuts are manufactured to confirm with ANSI B18.2.2
The cover material is identical to the body, Depending on the valve size and pressure class, either a casting or a forging is used.
■ HINGE PIN
The hinge pin is inserted 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.
The cast steel body is designed with a wall thickness which is greater at any point than the minimum requirement provided by API Std. 600 or API 6D. Port and seat passage dimensions conform to ANSI B16.5 Pipe Fitting the welded-in type seat ring is standard to allow interchangeability. the standard body-bonnet joint is male-female, and the flange is round for all valves.