Pressure responsive valve assembly

摘要

A pressure responsive valve assembly which comprises a housing having an upper part and a lower part. A fluid coupling with an inlet and an outlet is contained in the lower housing part and a fluid passageway extends between and connects the inlet to the outlet. A gate is slidably mounted within the lower housing part and movable between a closed position in which the gate extends across the passageway and blocks fluid flow between the inlet and outlet, and an open position in which the gate opens at least a portion of the fluid passageway. The actuation of the gate is controlled by a pressure responsive diaphragm which permits the gate to move to its open position only when the pressure from an external pressure line falls below a predetermined amount.