CNPC, SINOPEC and CNOOC Material & Equipment Corporation

Hydraulic Operated Safety Valve mainly includes prepa- ration valve and hydraulic operator, is the execution unit of well safety system. High pressure oil enter into the empty cavity of upper operator, and compress the spring of lower operator to open the valve, when the wellhead equipments suffer from dangerous pressure, control system relief the pressure of cylinder after receiving the signal sent by sensor, spring push stem to close valve and wellhead equipments, ensure the equipment safety.