This Standard specifies the requirements for the attachment of multi-turn actuators to valves. Throughout this Standard, "actuator" may be understood as "actuator and/or gearbox". It specifies: -those flange dimensions which are necessary for the attachment interface of actuators to general purpose industrial valves; -those driving component dimensions of actuators which are necessary to attach them to the driven components; -reference values for torque and thrust for flanges having the dimensions specified in this Standard.