Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1993-01-19
1994-01-18
Michalsky, Gerald A.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60427, 60452, 91512, 137596, 13759613, 1376256, 13762563, F15B 904, F15B 13042
Patent
active
052791211
ABSTRACT:
A pilot-actuated, pressure-compensated flow and directional control valve assembly (11) is provided in which a main valve spool (95) is positioned in response to a pressure differential between a pilot chamber (119) and a reaction chamber (117). Flow of fluid from an inlet port (29) is controlled by means of a pilot valve assembly (97), into the pilot chamber (119), while fluid flows out of the pilot chamber (119) through a fixed orifice (67) to a pump load sense port (61). The main valve spool (95) acts as an inlet compensator. If the pressure at a load L is above inlet pressure, the main valve spool (95) acts as an inlet check, preventing reverse flow. If there is a higher load pressure at another load circuit in the system, such as a steering valve S, there will be an increase in pressure in the reaction chamber (117), thus closing off the main spool (95), reducing the flow from the inlet port (29) to the work port (47), and giving more priority to the steering valve S. If a priority circuit demands more flow at a lower pressure than the pump can provide to both circuits, the main spool (95) closes in an attempt to maintain a margin pressure which insures that the priority circuit gets the flow it needs.
REFERENCES:
patent: 2526709 (1950-10-01), Tait
patent: 2600348 (1952-06-01), Walthers
patent: 3602243 (1971-08-01), Holt
patent: 3893471 (1975-07-01), Byers
patent: 4126293 (1978-11-01), Zeuner
patent: 4201116 (1980-05-01), Martin
patent: 4220174 (1980-09-01), Spitz
patent: 4693272 (1987-09-01), Wilke
Eaton Corporation
Kasper L. J.
Michalsky Gerald A.
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