Motors: expansible chamber type – With motive fluid valve
Patent
1974-11-19
1976-06-15
Schwadron, Martin P.
Motors: expansible chamber type
With motive fluid valve
92 5R, 92 82, 92 86, 92112, 92134, F15B 1108, F15B 1304, F15B 2104
Patent
active
039629562
ABSTRACT:
This invention relates to a hydropneumatic valve actuator comprising an outer cylindrical casing and an inner cylindrical casing both having closure means at each end. The inner cylindrical casing is positioned in said outer casing and is transversely spaced therefrom to define an elongated annular gas chamber. A piston slidably mounted in said inner casing has a piston rod extending axially from one end thereof through an axial bore in one of said closure means. The gas chamber as well as the portion of the inner casing between the piston and the other closure means, are adapted to be charged with gas under pressure and the portion of the inner casing between the piston and the closure means through which the piston rod extends is adapted to be charged with liquid.
The piston is provided with a pair of spaced annular seals and means are provided to prevent gas leakage past one of the seals into the portion of the inner casing charged with oil under pressure and to sense leakage of oil past the other seal.
REFERENCES:
patent: 2679827 (1954-06-01), Perdue
patent: 2807021 (1957-09-01), Chellis
patent: 3063423 (1962-11-01), Riordan
patent: 3078065 (1963-02-01), Vickery
patent: 3248879 (1966-05-01), Natho
patent: 3316817 (1967-05-01), Ellis
patent: 3531065 (1970-09-01), Brown
patent: 3704652 (1972-12-01), Hoenick
patent: 3815481 (1974-06-01), Pauliukonis
Colvin Arthur B.
Greer Hydraulics, Inc.
Hershkovitz Abraham
Schwadron Martin P.
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