Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1989-01-09
1991-03-19
Kwon, John T.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
91446, 91518, 137596, F15B 1102, F16H 6142, F03C 108
Patent
active
050000012
ABSTRACT:
There is provided control apparatus for controlling fluid flow between a bidirectional motor, a pump and a container, and includes a control valve that has a slide operative between neutral and first and second operative positions. A compensating valve is provided in the supply conduit that holds the upstream pressure drop at the control valve substantially constant and is controlled by load pressure sensing circuitry. The load pressure circuitry includes two branches that are connected through a change over valve to the compensating valve. There is provided an over pressure valve and a throttle point in each branch, each branch being connected to a load pressure sensing orifice of the control valve housing and fluidly connected through the slide to one of the housing motor orifices, the one depending upon whether the slide is in its first or in its second position. The circuitry permits the actuating pressure for operating the motor in one direction to be different from that for operating it in the other direction.
REFERENCES:
patent: 3982469 (1976-09-01), Bianchetta
patent: 4051868 (1977-10-01), Andersen
patent: 4203292 (1980-05-01), Deininger
patent: 4738103 (1988-04-01), Tha
Christensen Carsten
Christensen Thorkild
Nissen Harry S.
Thomsen Svend E.
Zenker Siegfried
Danfoss A/S
Easton Wayne B.
Johnson Clayton R.
Kapsalas George
Kwon John T.
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