This standard specifies the terminology and definition,technical requirements,test method,inspection,marking,packaging and storage conditions of explosion?proof version electric valve actuator.(Hereinafter referred to as the actuator) This standard applies to the design,manufacturing and inspection of the actuator with the type of protection “d”,group II,explosive gas mixture as level A,B,C,allowing maximum surface temperature of 85 ℃(T6)~135 ℃(T4)