Hydraulic Operated Safety valve mainly includes preparation vavle 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 equipment suffer from the dangerous pressure. control system relief the pressure of cylinder after receiving the signal sent by the sensor, spring push stem to close valve and wellhead equipments, ensure the equipment safety.

Working principle of safety valve: