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Fluid control valve

Abstract:

A fluid control valve includes first and second valves. The first valve is adjustable under the control of a first valve actuator between a closed position in which flow of fluid through the first valve is prevented and an open position in which flow of fluid through the first valve is permitted. The second valve comprises a second valve actuator adapted such that the first valve actuator bears against the second valve actuator in each of said first and second positions to urge the second valve into an open configuration allowing flow of fluid. The first valve actuator is adjustable to a third position in which the first valve actuator is spaced from the second valve actuator by a separation sufficient to allow fluid pressure at the inlet to cause the second valve to close, preventing flow of fluid through the fluid control valve.