According to the requirement for engineering controls, the control function of electric butterfly valves is achieved by the electric actuator. The purpose of using electric butterfly valves is to control the opening, closing and regulating linkage of the valve by non-manual electrical control or computer control. At present, the use of the electric actuator is not only to save manpower. Because the function and quality of products from different manufacturers are quite different, it is equally important to choose both electric actuators and corresponding valves for the engineering.
When choosing electric actuators, you should make sure the control mode of electric actuators according to the production process control requirements. The control mode of electric actuators generally falls into two categories: switch type (open-loop control) and modulating type (closed-loop control).
1. Switch type (open-loop control)
Generally, the switch type electric actuator can control the opening or closing of the valve, and the valve is either in a fully open position or in a fully closed position. This kind of valve does not need to accurately control the medium flow.
It is particularly worth mentioning that switch type electric actuators can be divided into separated structure and integrated structure due to different structures, which cannot be ignored during the selection, otherwise, mismatches will often occur during on-site installation. For instance, there will be a mismatch between the control system and the actuator with improper structure.
2. Modulating type (closed-loop control)
The modulating electric actuator has a switch-type integrated structure and can precisely regulating the medium flow. Besides, it can also accurately control the valve.
When choosing electric actuators, you should make sure the control mode of electric actuators according to the production process control requirements. The control mode of electric actuators generally falls into two categories: switch type (open-loop control) and modulating type (closed-loop control).
1. Switch type (open-loop control)
Generally, the switch type electric actuator can control the opening or closing of the valve, and the valve is either in a fully open position or in a fully closed position. This kind of valve does not need to accurately control the medium flow.
It is particularly worth mentioning that switch type electric actuators can be divided into separated structure and integrated structure due to different structures, which cannot be ignored during the selection, otherwise, mismatches will often occur during on-site installation. For instance, there will be a mismatch between the control system and the actuator with improper structure.
2. Modulating type (closed-loop control)
The modulating electric actuator has a switch-type integrated structure and can precisely regulating the medium flow. Besides, it can also accurately control the valve.
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