Fluid handling – Ambient condition change responsive – Underwater
Patent
1999-06-21
2000-10-03
Chambers, A. Michael
Fluid handling
Ambient condition change responsive
Underwater
251327, 251282, 251 636, 251 635, F16K 1736
Patent
active
061258741
ABSTRACT:
There are disclosed three embodiments of a gate valve having a fail safe actuator which is especially useful in a subsea environment at considerably depth below water surface. The gate is urged to open position by control pressure and is moved to closed position, upon loss of a controlled condition, by means of a spring acting between the actuator and the stem. In one embodiment, when the body pressure is low, a floating ring sealably shiftable within an annular space between the stem and actuator is urged by body pressure into a position to engage a stop on the stem, and thus provide a force urging it in a direction to close the gate, when body pressure is below ambient, and by ambient pressure to a position to engage a stop on the actuator when body pressure is above ambient. In a second embodiment of the invention, the valve includes a balance stem which is spring-pressed to engage the end of the gate opposite its operating stem, when body pressure is low relative to ambient, but moves out of engagement with gate and into a limited position in engagement with the actuator, when body pressure is high relative to ambient. In the third embodiment of the invention, the valve includes both the floating ring and the spring-pressed balance stem of the first and second embodiments.
REFERENCES:
patent: Re30115 (1979-10-01), Herd et al.
patent: 2885172 (1959-05-01), Natho
patent: 2974677 (1961-03-01), Natho
patent: 3765642 (1973-10-01), Nelson
patent: 3770247 (1973-11-01), Nelson
patent: 3933338 (1976-01-01), Herd et al.
patent: 4029294 (1977-06-01), McCaskill et al.
patent: 4135546 (1979-01-01), Morrison
patent: 4230299 (1980-10-01), Pierce, Jr.
patent: 4294284 (1981-10-01), Herd
patent: 4311297 (1982-01-01), Barrington
patent: 4436279 (1984-03-01), Bonds et al.
patent: 4489756 (1984-12-01), Balz
patent: 4585207 (1986-04-01), Shelton
patent: 4809733 (1989-03-01), Hawkins
patent: 4871143 (1989-10-01), Baker
patent: 4925154 (1990-05-01), Baker
patent: 4934652 (1990-06-01), Golden
McEvoy Brochure entitled The McEvoy Automatic Sealing System; pp. 2-3.
McEvoy Brochure entitled Subsea Stack Valves; pp. 4086-4087.
McEvoy Brochure entitled Patented* McEvoy Valves Solve Unique Operating Problems In Deep and Very Deep Water (2 pages).
Chambers A. Michael
Dril-Quip, Inc
McShane Thomas L.
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