VALVE

摘要

A two-stage, bi-directional valve is provided for controlling gas flow into and out of a storage volume (70). The solenoid (52) is provided to actuate a first stage piston (46) to seal communication with a pressure source. In doing so, the sources imparted by the solenoid overcome biasing forces applied by a resilient spring (47) on the first stage piston. Simultaneously, actuation of the first stage piston opens the bleed passage (36) to permit the edepressurization of space behind the second stage valve. Upon sufficient depressurization, the second valve (40) is unseated from the main orifice by fluid pressure forces, thereby creating the flow path for escape of the gaseous fluid through the main orifice.