Motors: expansible chamber type – Working member position responsive motive fluid control – Working member carries part within working chamber which...
Patent
1981-07-27
1984-02-07
Walton, George L.
Motors: expansible chamber type
Working member position responsive motive fluid control
Working member carries part within working chamber which...
91401, 92152, 92162R, 251 62, 277 58, 277113, 277236, F15B 13042
Patent
active
044296207
ABSTRACT:
A hydraulically operated actuator employs multiple metal-to-metal static seals to isolate the hydraulic fluid and to isolate the actuator from surrounding contaminating (ambient) fluids. A housing contains at least two linearly spaced apart chambers. A piston reciprocates from a retracted position to an extended position (power stroke) and from the extended position to the retracted position (return stroke) in one of the chambers (hydraulic chamber). The hydraulic chamber is separated by the piston into two sections, one of which contains high pressure hydraulic fluid and the other of which contains low pressure hydraulic fluid. A first static metal seal ring unit is designed to seal first at the completion of the power stroke of the piston to isolate the low pressure hydraulic fluid section from external contaminating fluids which may be at a higher pressure. A second static metal seal ring unit is designed to seal at the completion of the return stroke of the piston also to isolate the low pressure section from external contaminating fluids. Power for the return stroke is primarily supplied by springs, with biasing pressure from the external environment providing a lesser contribution. A third static metal seal ring unit may be employed to obtain a simultaneous seal with the first metal seal ring unit to isolate the high pressure section from the low pressure section at the completion of the power stroke of the piston.
REFERENCES:
patent: 2911952 (1959-11-01), Peras
patent: 3047300 (1962-07-01), Taylor
patent: 3072104 (1963-01-01), Marsh
patent: 3238850 (1966-03-01), Desmarchelier
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patent: 3507190 (1970-04-01), Kluczynski et al.
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patent: 3974910 (1976-08-01), Papai
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Burkhardt Joseph A.
Childers Thomas W.
Hanson Harry R.
Harkrider Bobby M.
Exxon Production Research Co.
Schneider John S.
Walton George L.
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