Patent ID: 7677266

Claim:
A manifolded fail-safe hydraulic control system for controlling fail-safe operation of a pipeline valve, said system comprising: a pump; a pressure regulator; a low pressure volume accumulator; a low pressure relief valve; a high pressure relief valve; a piloted 2-way dump valve; a 3-way high and low pressure pilot; a reservoir; and a manifold; said manifold having a plurality of passageways capable of allowing liquid flow within said passageways; said pump, said low pressure volume accumulator, said pressure regulator, said low pressure relief valve, said high pressure relief valve and said piloted 2-way dump valve each being containable within one of said manifold and said reservoir and each being connectable to at least one said passageways; said pump, said low pressure volume accumulator, said pressure regulator, said low pressure relief valve, said high pressure relief valve, said piloted 2-way dump valve, said 3-way high and low pressure pilot, said manifold, and said reservoir being in circuit relationship to a pipeline pressure; said manifold capable of producing a pressure effective for controlling a spring return actuator in communication with a valve controlling the pipeline pressure.