As we all know, the operating characteristics and the utilization of the electric device depend on the type of valve, the valve operation specification and the position of the valve in the pipeline or equipment. Therefore, the electric device is an indispensable device to realize the valve program control, automatic control and remote control, the movement process can be controlled by the size of the stroke, torque or axial thrust.

Electric devices are generally made of the following parts:

Special motor, which is characterized by strong overload capacity, large starting torque, small moment of inertia, and intermittent work.

Reduction mechanism for reducing the output rotational speed of the motor.

Stroke control mechanism to adjust and control the valve opening and closing position.

A torque limiting mechanism, which is used to adjust the torque (or thrust) and to make it less than a predetermined value.

Manual, electric switch mechanism, manual or electric operation interlocking mechanism.

Opening indicator to show the position of the valve in the opening and closing process.

Electric device according to the type of valve

1 angle travel electric device (angle 360 degrees) for butterfly valve, ball valve, plug valve, etc..

The rotation of the output shaft of the electric device is less than a week, that is less than 360 degrees, usually 90 degrees to achieve the opening and closing of the valve process control. This kind of intelligent electric remote control device according to the different ways of installing the interface is divided into direct type, base crank two.

A) directed: refers to the form of installation and valve direct electric device output shaft.

B) the base type of the base type: the output shaft is connected with the valve stem through a crank.

2 rotary electric device (angle 360 degrees) for gate valve, globe valve, etc.. The output shaft of the electric device is more than a week, that is more than 360 degrees, the general need to achieve more than the valve opening and closing process control.

3 straight trip (linear motion) is applied to single seat control valve, double seat control valve. The movement of the output shaft of the electric device is linear movement type, not the rotational form.

Rotork production in China multi turn, straight trip and travel angle of intelligent electric actuator and various supporting the valve, composed of execution units. In the automatic control system is widely used in (hydropower, thermal power, nuclear power plants, oil and gas fields, oil refineries, oil (gas) pipeline, iron and steel, chemicals, fertilizers, pharmaceuticals, printing and dyeing, sugar, sewage treatment, water supply engineering of vapor liquid pipeline, both meet frequent regulation and control, and can meet the requirements of intermittent control, and field bus intelligent measurement and control can be realized.