Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1980-01-03
1981-06-02
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
1374933, F16K 17196
Patent
active
042705673
ABSTRACT:
A control valve operating as a combined relief and make-up valve for use in hydraulic apparatus comprises a valve housing provided with a blind hole, a valve seat tightly engaged with the inlet of the blind hole, a cylindrical hollow make-up poppet slidably inserted into the blind hole, a cylindrical relief poppet slidably inserted within the make-up poppet, a screw member adjustably engaged with the inner surface of the end of the make-up poppet, a coil spring disposed between the screw member and the relief poppet, and a balance piston having one end tightly inserted into the inner cylindrical hole of the relief poppet. The valve housing is provided with a first opening connected to an external hydraulic supply device and a second opening connected to a hydraulic source. The first and second openings are communicated with each other in response to differential pressure of an operating fluid so as to operate the control valve as a relief valve or a make-up valve.
REFERENCES:
patent: 807269 (1905-12-01), Hildebrand
patent: 3112763 (1963-12-01), Tennis
patent: 3856041 (1974-12-01), Cryder
patent: 4016903 (1977-04-01), Akashi
patent: 4217927 (1980-08-01), Morita
Nilson Robert G.
Toshiba Kikai Kabushiki Kaisha
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