When selecting an electric actuator, the electric actuator must consider the control mode of the electric actuator in addition to the matching of the valve and other components. In terms of control modes, electric actuators usually have two kinds of switch-type electric actuators and adjustment-type electric actuators. The main difference is that the functions of the valve switch control are different.
1, switch-type electric actuators Switch-type electric actuators are also known as open-loop control electric actuators, this actuator in the implementation of the valve operation only open and close two actions, that is, only the valve is fully open Or all off the state. Switch-type electric actuators cannot control the amplitude of the valve switch and therefore cannot precisely control the flow of the medium.
There are two types of switch-type electric actuators: split structure and integral structure. The switchable electric actuator with split structure must be equipped with a control unit to complete the control operation, so it is inconvenient to install the entire system, and the investment cost is large and the failure rate is high, which is not conducive to diagnosis and maintenance.
The integrated electric actuator combines the control unit and the electric actuator into an integral structure, and does not need to be additionally equipped with a control unit to complete the operation of the valve. The integrated electric actuator supports remote control. As long as it outputs control information to the electric actuator, it can complete the operation task by itself.
2. Adjustable electric actuators Adjustable electric actuators are also called closed-loop control electric actuators. In addition to the control functions of the valve switch, this type of actuator can also accurately control the valve opening amount to achieve The precise control of the medium flow. Adjustable electric actuators are divided into electric open type electric actuators and electric type electric actuators in the form of work.
Electric open type electric actuator and electric switch type electric actuator have different working control signals. When selecting the type, the working form of electric actuator should be determined. Otherwise, it is not fit in the control system and it is difficult to modify.
Adjustable electric actuators have lost signal protection. When the actuator is unable to receive signals due to line faults or other reasons, it will automatically open and close the control valve to the established state, usually the valve is fully open, fully closed, or kept in position. .
1, switch-type electric actuators Switch-type electric actuators are also known as open-loop control electric actuators, this actuator in the implementation of the valve operation only open and close two actions, that is, only the valve is fully open Or all off the state. Switch-type electric actuators cannot control the amplitude of the valve switch and therefore cannot precisely control the flow of the medium.
There are two types of switch-type electric actuators: split structure and integral structure. The switchable electric actuator with split structure must be equipped with a control unit to complete the control operation, so it is inconvenient to install the entire system, and the investment cost is large and the failure rate is high, which is not conducive to diagnosis and maintenance.
The integrated electric actuator combines the control unit and the electric actuator into an integral structure, and does not need to be additionally equipped with a control unit to complete the operation of the valve. The integrated electric actuator supports remote control. As long as it outputs control information to the electric actuator, it can complete the operation task by itself.
2. Adjustable electric actuators Adjustable electric actuators are also called closed-loop control electric actuators. In addition to the control functions of the valve switch, this type of actuator can also accurately control the valve opening amount to achieve The precise control of the medium flow. Adjustable electric actuators are divided into electric open type electric actuators and electric type electric actuators in the form of work.
Electric open type electric actuator and electric switch type electric actuator have different working control signals. When selecting the type, the working form of electric actuator should be determined. Otherwise, it is not fit in the control system and it is difficult to modify.
Adjustable electric actuators have lost signal protection. When the actuator is unable to receive signals due to line faults or other reasons, it will automatically open and close the control valve to the established state, usually the valve is fully open, fully closed, or kept in position. .
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