Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1977-03-29
1979-04-03
Rosenthal, Arnold
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 62, 91437, 91438, F16K 31143, F15B 13042
Patent
active
041473256
ABSTRACT:
A hydraulic control assembly especially suited for operation of a fail-safe valve. An integral structure is provided having a pair of check valves disposed in passageways extending from one chamber of a piston operator to a hydraulic reservoir and the other chamber of the piston reservoir, and in a fluid line extending from a high pressure source. In a fail-safe valve, cavity pressure normally acts on the valve stem and provides the force which moves the valve to its close position. A spring is disposed in the second chamber of the piston operator and, in conjunction with any force resulting from internal cavity pressure on the valve stem, aids in closing the valve. The second chamber is equal or greater in volume than the first chamber so that all of the hydraulic fluid displaced from the first chamber during valve closing can flow into the second chamber. In this way, the hydraulic power needed to pump hydraulic fluid back to the reservoir is not effected by installed hydraulic system variations. Additionally, these results are achieved while containing the fluid in a closed system. Fail-safe valves can be designed to either fail to the open or fail to the closed position.
REFERENCES:
patent: 2367682 (1945-01-01), Kehle
patent: 2922401 (1960-01-01), Hromas et al.
patent: 3244399 (1966-05-01), Jones et al.
patent: 3495501 (1970-02-01), Kure-Jensen
patent: 3656708 (1972-04-01), Hobbs
patent: 3757646 (1973-09-01), Rohner
patent: 3933338 (1976-01-01), Herd et al.
Combustion Engineering Inc.
Rosenthal Arnold
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