Power transmission

Details Power transmission Power transmission

1975-02-10

1976-06-22

Cohan, Alan

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

91420, 91455, 13759613, 13759618, 1375962, F15B 1304

Patent

active

039645053

ABSTRACT:
A directional valve for hydraulic power transmission systems of the closed center type has a spool for directing fluid from inlet to either of two motor ports through one or the other of a pair of check valves for holding the load against dropping. A second pair of check valves connect from each motor port directly to a fluid return port independently of the spool. The second check valves have control chambers the maximum pressure in which is limited by a pilot relief valve to cause the check valve to act as a maximum pressure limiting valve for its motor port. A small pilot piston responsive to operating pressure in the opposite motor port can mechanically open the pilot relief valve thereby causing the second check valve to act as a counterbalance valve to prevent the motor from being driven by an overhauling load.

REFERENCES:
patent: 3234957 (1966-02-01), Allen
patent: 3488953 (1970-01-01), Haussler
patent: 3680588 (1972-08-01), Hufeld et al.

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