IMPROVEMENTS RELATING TO SEALS,申请号DE19823277885-传众专利搜索

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发明名称	IMPROVEMENTS RELATING TO SEALS
摘要	A sealing assembly (20) for a ball valve comprises two non compressible and relatively movable members, for example the ball (24) and seal housing (26) of a ball valve, having located therebetween a sealing element (32) which is inflatable by the introduction of hydraulic fluid. The sealing element (32) is located in a recess in member (26) so that when the hydraulic pressure is released the element (32) retracts into the recess to release the sealing engagement and facilitate the relative movement of members (24, 26). A resilient rubber ring (40) is provided to bias the seal housing (26) away from the position of sealing engagement to also facilitate movement of members (24, 26). A second sealing element (25) is also provided. Both elements are carried by the seal housing (26) which is in the form of an annular piston movable by the hydraulic fluid.
申请公布号	DE3277885(D1)	申请公布日期	1988.02.04
申请号	DE19823277885	申请日期	1982.04.28
申请人	THE BRITISH PETROLEUM COMPANY P.L.C.	发明人	BROOKES, DAVID ALAN;ELLS, JOHN WILLIAM
分类号	F16K3/20;F16K5/06;F16K5/20;(IPC1-7):F16K5/20	主分类号	F16K3/20
代理机构		代理人
主权项
地址

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