볼 밸브(Ball Valve)

볼 밸브(Ball Valve)

1. 일반사항

• Tight on-off control

• 디스크가 공 모양이고, 전면구와 반면구가 존재. 90도로 회전하여 개폐한다. 내누설 구조를 위한 밸브 시팅 및 씰링 구조에 유의 해야 한다.

• 장점 : GLOBE 밸브보다 가볍고, 조절범위가 크다. 작동 토크가 적게 든다. 실링이 우수하다. 압력손실이 작다.

• 단점 : 볼 회전 각도에 따라 심하게 유량이 변하여 미세 제어 적합 X, 비쌈.

2. 종류

• Welded: Welded ball valves guarantee the absence of leakages along all the valve's life, with no requirement for maintenance operations. This is a highly important requisite especially for ball valves installed onto underground and submarine pipelines. It is also often chosen for hazardous fluids.

• Top entry: The ball can be taken out removing the top cover. It can be repaired on site.

• End entry: The body is one piece. The ball is entered from the axial entry.

• Split body: there are two or three pieces. It allows easy inspection and maintenance of all internal parts

• Float ball valve: the ball is held on two seat rings.

• Trunnion ball valve: the ball is supported on its vertical rotation axis by a trunnion. The trunnion absorbs the pressure from the flow, therefore the contact between the ball and the seat is not excessively stressed and the operating torque can remain low. This design is recommend for big diameters and high pressure

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[STUDY/Valve] - 밸브의 구조(Structure of valve)

[STUDY/Valve] - 게이트 밸브(Gate Valve)

[STUDY/Valve] - 그루브 밸브(Globe Valve)

[STUDY/Valve] - 체크 밸브(Check Valve)

[STUDY/Valve] - 버터플라이 밸브(Butterfly Valve)

[STUDY/Valve] - 기타 밸브(Diaphragm Valve, Plug Valve, Needle Valve)

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출처 : My Brain + Google Search + www.valvias.com