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公开(公告)号：US5178366A
公开(公告)日：1993-01-12
申请号：US832343
申请日：1992-02-07
IPC分类号： F16K1/36 , F16K1/42 , F16K31/122
摘要： A fluid flow control valve is provided with a seal comprising a thin metallic film backed by a resiliently deformable body. The seal is mounted on a closure part which may be either the valve stem or the valve seat. The thin film and deformable body are deformed so as to conform to the surface the metallic film seals against as the valve is closed. As the valve is opened, the deformable body returns to its initial state thus returning the thin film to its initial state.
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公开(公告)号：US5161571A
公开(公告)日：1992-11-10
申请号：US804380
申请日：1991-12-10
CPC分类号： F16K15/148 , F16K15/02 , F16K15/144 , Y10T137/7783 , Y10T137/789
摘要： A check valve comprises a valve body having inlet and outlet passages and a cavity in which a diaphragm operates. The inlet passage connects with the cavity through an upstream wall partly defining the cavity and the outlet passage connects with the cavity through a downstream wall partly defining the cavity. The diaphragm has an annular sheet metal part which is secured to one of the walls and carries a movable seal. The movable seal cooperates with a sealing element to provide a circular fluid seal. In a first embodiment, the inlet passage connects with the cavity through openings located inside the periphery of the circular fluid seal. In a second embodiment the inlet passage connects with the cavity through openings located outside the periphery of the circular fluid seal. The movable seal may be a sealing surface in which case the sealing element is a seal ring, or the movable seal may comprise a seal ring in which case the sealing element is a sealing surface.
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