Pressure balanced bellows seal

Details Pressure balanced bellows seal Pressure balanced bellows seal

F - Mech Eng,Light,Heat,Weapons

16

J

F16J 15/52 (2006.01) F16J 3/04 (2006.01) F16K 41/10 (2006.01)

Patent

CA 2158215

A pressure balanced bellows seal for a valve or pump is disclosed. The bellows seal includes a seal bellows assembly which is operatively and sealingly attached to the valve stem, a counterbellows assembly which is substantially concentric with the seal bellows assembly, a midplate which operatively joins the seal bellows assembly and the counterbellows assembly, and an inert fluid within the cavity formed by the seal bellows assembly and the counterbellows assembly and which is moveable therebetween to compensate for volumetric changes resulting from the axial movement of the valve stem. The inert fluid balances the pressure of the process fluid and distributes it substantially uniformly against the seal bellows assembly and the counterbellows assembly thussubstantially eliminating any pressure stresses within the bellows assemblies.

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