Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1978-09-28
1980-04-29
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60445, 60452, 60484, F15B 1116, F16H 3946
Patent
active
041999428
ABSTRACT:
A load sensing hydraulic system is disclosed of the type in which a load signal is communicated from downstream of a main flow control orifice to a device which is operable to vary the fluid delivery rate in response to changes in the load signal. Disposed in the load signal conduit is a load signal modulating valve which, in one position, communicates the load signal, substantially unchanged, to the variable fluid source. In another position of the modulating valve, the load signal chamber of the variable fluid source is drained to tank, while in intermediate positions of the modulating valve, a portion of the load signal is communicated to the variable fluid source, and a portion is bled to tank. Modulation of a load signal permits flow control in an hydraulic system, independent of the position or movement of the main spool valve. The input to the modulating valve may be manual or electric, and if electric, may be remote, or may be automatic in response to certain predetermined system conditions.
REFERENCES:
patent: 3455210 (1969-07-01), Allen
patent: 3486334 (1969-12-01), Miller
patent: 3908375 (1975-09-01), Young
patent: 3971216 (1976-07-01), Miller
patent: 3990236 (1976-11-01), Johnson
patent: 4011721 (1977-03-01), Yip
patent: 4044786 (1977-08-01), Yip
Eaton Corporation
Geoghegan Edgar W.
Kasper L.
McCloskey R. J.
Yakimow J.
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