There are many types of explosion-proof valve electric devices on the market, and the common ones are as follows:
Angle stroke valve electric device, straight stroke valve electric device, electric regulating valve, PID electric regulating actuator and solenoid valve. The first four belong to the DDZ type. The following is a brief introduction to the electric actuators for straight-stroke valves (DKJ) and electric actuators for angular-stroke valves (DKZ).
Design requirements for explosion-proof valve electric devices
Straight and angular travel explosion-proof valve electric devices are used to receive the standard value galvanic signals of 0 ~ 10, 4 ~ 20 mA or 1 ~ 5 volts sent by the regulator or other instruments, and become displacement after the actuator Thrust or corner torque to operate switches, valves, etc. to complete the task of automatic adjustment. Both types of actuators previously consisted of servo amplifiers and actuators. Nowadays, the organic, intelligent, and integrated structures have similar structures, working principles, and methods of use. The only differences are an output displacement (thrust) and an output angle (torque).
Explosion-proof valve electric device is also called electric actuator. It is a driving device that can provide linear or rotary motion. It uses a certain driving energy and works under a certain control signal.
The disadvantages of explosion-proof valve electric devices are:
The structure is more complicated, and it is more prone to failure. Because of its complexity, the technical requirements for on-site maintenance personnel are relatively high; the motor runs to generate heat. If it is adjusted too frequently, it is easy to cause the motor to overheat and generate thermal protection. It will also increase the wear on the reduction gear; in addition, it runs slowly. It takes a long time from the regulator to output a signal to the corresponding position of the regulating valve in response to movement. This is because the explosion-proof valve electric device is not as good as pneumatic, Place for hydraulic actuator.