Patent ID: 6029693
Filing Date: 2000-02-29
Classification: F16K,F17D,Y10T

Abstract:
A valve driving assembly for actuating a shutoff valve or a dump valve incorporated in a gas pipeline, said valve driving assembly comprising:a gas/oil type booster having a gas chamber and an oil chamber;a gas pipe branched from a primary side of the gas pipeline and communicating with said gas chamber of said gas/oil type booster;an actuator having an actuator cylinder;a hydraulic pump disposed between said gas/oil type booster and said actuator cylinder, said hydraulic pump being connected to said oil chamber of said gas/oil type booster;an oil pipe connecting said hydraulic pump and said oil chamber of said gas/oil type booster with said actuator cylinder through a switching valve,wherein said oil/gas type booster is powered by the primary side pressure of the gas pipeline such that increased hydraulic pressure can be delivered to said actuator cylinder in order to open and close the shutoff valve or the dump valve, andwherein said oil/gas type booster can be reset with pressure output from said hydraulic pump thereby causing the gas in said gas chamber of said oil/gas type booster to return to the gas pipeline via said gas pipe.