Fluid handling – Systems – Valves with separate – correlated – actuators
Patent
1983-08-08
1985-07-23
Walton, George L.
Fluid handling
Systems
Valves with separate, correlated, actuators
13762566, 13759615, 13759618, 92 66, F16K 31122
Patent
active
045303770
ABSTRACT:
A block valve (10) for selectively establishing and selectively blocking communication between a pressurized fluid supply (30), a fluid actuated device (DHSV) and a reservoir (35). The valve comprises a valve body (41, 42) with an inlet (81), an outlet (82) and a bleed port (83) and first and second piston-type plunger elements (61, 71) slidably mounted in piston chambers (51, 52) formed in the bore (43, 45) of the valve body. The second plunger element (71) is slidably mounted on the first plunger element (61) in sleeved relation therewith. Both plunger elements (61, 71) are continuously urged by springs (66, 75), respectively, to a first operating position wherein communication between the ports (81, 82, 83) is blocked by seal means (94, 95, 96) and blocking means (64) mounted on the plunger elements. Ports (49, 56) in the valve body are connected to a pilot pressure supply (12) whereby the plunger elements (61, 71) are simultaneously movable to second operating positions upon application of pilot pressure to the plunger elements. An annular chamber (91) formed by a reduction in diameter of the second plunger element is placed in communication between the inlet and outlet ports (81, 82) to establish communication therebetween and the seal means (94, 95, 96) are disposed so that communication is blocked between each of these ports and the bleed port (83). Upon interruption of the pilot supply (12), the pressurized pilot fluid is removed from the plunger elements but is removed from the plunger element (61) through a fluid delay circuit (98, 99) whereby the second plunger element (71) is returnable to its first operating position before the first plunger element (61) reaches its first operating position thus blocking communication between the inlet and outlet ports (81, 82) while opening communication between the outlet port (82) and bleed port (83) for a limited period. When the valve (10) is connected in a safety system to control the flow line (84) to a fluid actuator for a DHSV, the valve will respond to a shut-down signal from the safety system to permit the downhole actuator to completely bleed its pressure and allow the DHSV to completely close in this limited time period prior to establishing a positive block in the control line between the DHSV and the safety system.
REFERENCES:
patent: 3716074 (1973-02-01), Peters
patent: 3895651 (1975-07-01), Okada et al.
patent: 4074702 (1978-02-01), Lewis
patent: 4147179 (1979-04-01), Miura
patent: 4209040 (1980-06-01), Peters
patent: 4304251 (1981-12-01), Schadel et al.
patent: 4320779 (1982-03-01), Peters
Joy Manufacturing Company
Marnock Marvin J.
Walton George L.
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