Patent ID: 8387665
Filing Date: 2013-03-05
Classification: F15B,F16L

Abstract:
1. A hydraulic fluid supply system comprising, in combination, a sump, a suction line disposed in said sump, a pump having a inlet in fluid communication with said suction line and an outlet in fluid communication with an outlet line, a pressure relief valve in fluid communication with said outlet line, an accumulator, a check valve only permitting fluid flow from said outlet line to said accumulator, another check valve only permitting fluid flow from said accumulator to said outlet line and a solenoid valve in series with said another check valve, said accumulator including a housing defining a cylinder and having an inlet/outlet port at one end, a piston disposed in said cylinder having a circumferential channel and an O-ring seal disposed in said channel and defining a first, fluid chamber in fluid communication with said inlet/outlet port and a second, gas chamber, and a compression spring and a gas disposed in said second, gas chamber for biasing said piston toward said first, fluid chamber.