GAS PRESSURE REGULATOR

摘要

A gas pressure regulator for supplying gas under pressure to a gas distribution network has a control valve 5 operated by an actuator 8 comprising a flexible diaphragm 7 urged in one direction to open the control valve by a spring 9. A feedback pipe 10 supplies gas from the downstream side of the control valve to the opposite side of the diaphragm to act against the spring and modify the operation of the control valve in accordance with downstream gas pressure. A restrictor arrangement 12 incorporated in the feedback pipe is also connected to the upstream side of the control valve and is designed to reduce the flow area through the feedback pipe automatically as the upstream pressure increases and thus prevent amplification of standing pressure waves formed in the gas distribution network.