Selection and classification of valve electric actuators

There are quite a few types of valves, and their working principles are not the same. Generally, the opening and closing control is realized by rotating the valve plate angle, lifting the valve plate, etc. When matching with an electric actuator, the electric actuator should be selected according to the type of valve. 1. Angular stroke electric actuator (rotation angle < 360 degrees) The rotation of the output shaft of the electric actuator is less than one turn, that is, less than 360 degrees, usually 90 degrees to realize the valve opening and closing process control. This type of electric actuator is divided into two types: direct connection type and base crank type according to the different installation interface methods. a) Direct connection type: refers to the form in which the output shaft of the electric actuator is directly connected to the valve stem. b) Base crank type: refers to the form in which the output shaft is connected to the valve stem through a crank. This type of electric actuator is suitable for butterfly valve, ball valve, plug valve, etc. 2. Multi-turn electric actuator (rotation angle> 360 degrees) The rotation of the output shaft of the electric actuator is more than one turn, that is, more than 360 degrees. Generally, multiple turns are required to realize the valve opening and closing process control. Such electric actuators are suitable for gate valves, globe valves, etc. 3. Straight stroke (linear motion) The movement of the output shaft of the electric actuator is a linear motion type, not a rotary form. This type of electric actuator is suitable for single-seat control valve, double-seat control valve, etc.
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