What details should be paid attention to when selecting the adjustable electric actuator?
The regulating electric actuator not only has the function of an on-off integrated structure, it can also accurately control the valve, thereby accurately adjusting the medium flow. Let's talk about the parameters that need to be noted when selecting the adjustable electric actuator.
A. Control signal type (current, voltage)
Regulating electric actuator control signals generally include current signals (4～20mA, 0～10mA) or voltage signals (0～5V, 1～5V). The type of control signal and parameters should be clarified when selecting the model. The most frequently used signal is a current signal of 4-20mA.
B. Work form (electric open type, electric close type)
The working mode of the regulating electric actuator is generally the electric opening type (take the control of 4-20mA as an example, the electric opening type means that the 4mA signal corresponds to the valve closing, and the 20mA corresponds to the valve opening), and the other is the electric closing type. (Take 4-20mA control as an example, the electric opening type means that the 4mA signal corresponds to the valve opening, and the 20mA signal corresponds to the valve closing). Under normal circumstances, the type selection requires a clear working form. Many products cannot be modified after leaving the factory, but some adjustable electric actuators can be modified at any time through on-site settings.
C. Loss of signal protection
Loss of signal protection means that when the control signal is lost due to line faults, the electric actuator will open and close the control valve to the set protection value. The common protection values are fully open, fully closed, and keep in place. It is not easy to modify afterwards. Intelligent electric actuators can be flexibly modified through on-site settings, and any position (0~100%) can be set as protection.
