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A fluid control circuit and method of operating equipment such as a blowout preventer having a two-way hydraulic piston and cylinder assembly. The circuit includes various features such as a dual pressure level independently controlled fluid supply, a dedicated secondary fluid supply reserved for su

A fluid control circuit and method of operating equipment such as a blowout preventer having a two-way hydraulic piston and cylinder assembly. The circuit includes various features such as a dual pressure level independently controlled fluid supply, a dedicated secondary fluid supply reserved for supplemental use, a dedicated fluid supply reserved for exclusive use in one operating branch, automatic sensor for applying a reserve fluid supply on a sensed demand, a pressure intensifier for increasing available operating force, and control circuitry for preventing loss of enhanced secondary operating energy into a primary circuit.

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A control circuit for supplying fluids to a pressure responsive valve operator having a double acting piston and cylinder assembly comprising, a fluid supply, a first control valve connected between the fluid supply and both sides of the piston and cylinder assembly, a pressure regulator connected t

A control circuit for supplying fluids to a pressure responsive valve operator having a double acting piston and cylinder assembly comprising, a fluid supply, a first control valve connected between the fluid supply and both sides of the piston and cylinder assembly, a pressure regulator connected to the fluid supply, a second control valve connected between the pressure regulator and both sides of the piston and cylinder assembly, a first selector check valve connected between one side of the assembly and each of said first and second control valves, and a second selector check valve connected between the second side of the assembly and each of the first and second control valves.