Double gas seal with bellows supported by backing and support rings

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United States of America Patent

PATENT NO 5924697
SERIAL NO

08943617

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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An improved gas seal having inboard and outboard seal units each defined by a pair of opposed and relatively rotatable seal faces, one face of each pair having appropriate grooves which communicate with a pressurized barrier gas, preferably an inert gas such as nitrogen. The inboard seal unit, at its other seal periphery, communicates with a process fluid being handled by a rotating equipment, namely a pump. Each seal unit has one of the seal rings, the nonrotating ring in the preferred embodiment, urged axially toward its opposed ring by a compact bellows which axially cooperates between the respective seal ring and a backing member. The bellows is positioned to create an isolation between the barrier and process fluids and to provide an effective diameter to provide desirable balance of pressures as imposed on the axially moving seal ring to optimize seal performance. The bellows at one end is connected to a support ring which is urged toward the adjacent seal ring with an annular gasket maintaining a soft sealed contact therebetween. The other end of the bellows is connected to a pressure piston which seats against a stationary gland. The process fluid urges the pressure piston into contact with the support ring to increase the sealing pressure at the gasket in the event of an improper balance between the pressures of the barrier and process fluids.

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Patent Owner(s)

Patent OwnerAddress
FLOWSERVE MANAGEMENT COMPANY5215 NORTH O'CONNOR BLVD SUITE 2300 IRVING TX 75039

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Adams, William V Scotts, MI 6 121
McCowey, Christopher D Portage, MI 4 57
Parker, Joseph C Otsego, MI 5 57

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