F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
137/77, 138/77.1
F15B 1/02 (2006.01) F15B 1/027 (2006.01)
Patent
CA 1050398
ABSTRACT A hydraulic power supply unit has a fluid reservoir And a motor-driven pump which delivers fluid under pressure to a hydraulic system through a check valve in a fluid supply line. A hydraulic pressure accumulator downstream of the check valve helps maintain the system under a predetermined pressure. An accumulator pressure release valve automatically relieves the accumulator and thus the connected system of hydraulic pressure when the pump is inactive. The valve has a valve body with a pilot port connected to the discharge side of the pump upstream of the check valve, an accumulator port in communication with the accumulator and a return port in communication with the reservoir. Internal passages within the valve body interconnect the pilot, accumulator and return ports, A movable valve member within the valve body moves to a closed position when the pump operates to block flow from the accumulator port to the return port, thereby pressurizing the accumulator and the system. Opposed surfaces of the movable valve member in its closed position are subjected, respectively, to pump discharge pressure act- ing through the pilot port and accumulator pressure acting through the accumulator port. These opposed surfaces are of unequal areas with the surface exposed to pilot pressure being of larger area so as to maintain the valve member in its closed position after the accumulator is fully charged. However, when the pump is deactivated so that no pressure acts through the pilot port, system pressure acting through the accumulator port moves the valve member to its open position to release accumulator and system pressure, reducing it to zero.
258445
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