Fluid handling – Systems – Supply and exhaust
Patent
1997-06-26
1999-01-12
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
60385, 60386, 114150, 137864, 137868, F15B 1117
Patent
active
058574883
ABSTRACT:
A hydraulic valve apparatus is for controlling pressurized fluid flow to at least a pair of coupled hydraulic actuators in response to operator signals. The valve apparatus comprises a main body having main ports communicating selectively with a fluid supply and fluid return, body ports to communicate with the actuators, and a scavenge port to communicate with the return. Each actuator communicates with two control valves and one scavenge valve on the valve body to control fluid flow relative to the actuators. Control devices cooperate with the control and scavenge valves of each actuator so as to actuate the respective valves simultaneously. The control devices maintain the two related control valves in the same phase with respect to each other, but in an opposite phase to the respective scavenge valve. In an emergency, an appropriate valve actuating device switches the appropriate control valves from a normally open to a normally closed position, while simultaneously switching the related scavenge valve from a normally closed to a normally open position. This permits an operating cylinder to passively displace an inoperative cylinder to enable operation of the apparatus with one actuator only.
REFERENCES:
patent: 5289756 (1994-03-01), Kobelt
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