Valve having pressure equalizing conduit

Details Valve having pressure equalizing conduit Valve having pressure equalizing conduit

1997-10-13

1999-04-06

Fox, John

Valves and valve actuation

Blow-out preventers

137629, E21B 3306

Patent

active

058906983

ABSTRACT:
Pressure can build up on one side of a valve bore sealing mechanism when it is closed. This can make the mechanism difficult to open. A bore network is provided which extends through the valve housing side wall from the inlet end of the valve bore to its outlet end. The network bypasses the sealing mechanism and its sealing areas. Needle valves, operative from outside the valve, are used to open or close the network. The network can be temporarily opened to enable pressure to equalize across the closed sealing mechanism, thereby freeing the mechanism so that it can be turned.

REFERENCES:
patent: 2092452 (1937-09-01), Gilbert
patent: 4066128 (1978-01-01), Davis et al.
patent: 4230185 (1980-10-01), Fredd
patent: 4278130 (1981-07-01), Evans et al.
patent: 4289165 (1981-09-01), Fredd
patent: 4406328 (1983-09-01), Brooks
patent: 4535852 (1985-08-01), Boyadjieff et al.
patent: 4575045 (1986-03-01), Martin et al.
patent: 4582293 (1986-04-01), Jones

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