Gas flow pulsation dampener and pressure differential control

摘要

A device with use in combination with an expansible sleeve-type gas flow control valve in a production gas supply between a compressor and a delivery line provides pressure differential control as between the valve inlet and the valve outlet by relating hydraulic control pressure around the resilient sleeve of the valve to valve outlet gas flow pressure through a primary piston and cylinder assembly. The primary piston is linked to a secondary piston in a secondary cylinder of smaller diameter which in turn communicates with an accumulator for dampening pulsations in the valve.