Accumulator arrangement for a booster brake mechanism

Abstract From the Canadian patent

Abstract, A hydraulic booster is provided with a pressure responsive dump valve and check valve arrangement which permits the booster to employ an accumulator ideally responsive to automotive brake applications. The check valve is operable to automatically charge the accumulator when the booster fluid source is called upon to supply fluid at operating pressure to the booster or other devices. The dump valve includes a stepped piston arrangement biased into a closed position by backpressure from the fluid source and operable by accumulator pressure to automatically dump the accumulated charge to the booster when source backpressure drops below a predetermined value.