Advantages & Disadvantages of Electric Actuator Valve and Pneumatic Actuator Valve
Advantages and disadvantages of electric actuator valve and pneumatic actuator valve
Electric valve
Electric actuators are mainly used in power plants or nuclear power plants, because a smooth, stable and slow process is required in the high-pressure water system. The main advantages of electric actuator are high stability and constant thrust that can be applied by users. The thrust generated by the maximum actuator can be as high as 225000kgf. Only hydraulic actuator can achieve such a large thrust, but the cost of hydraulic actuator is much higher than that of electric actuator. The anti deviation ability of the electric actuator is very good, and the output thrust or torque is basically constant, which can well overcome the unbalanced force of the medium and achieve the accurate control of process parameters. Therefore, the control accuracy is higher than that of the pneumatic actuator. If the servo amplifier is used, the exchange of positive and negative effects can be easily realized, and the off signal valve position state (hold / fully open / fully closed) can be easily set. In case of fault, it must stay in the original position, which can not be done by the pneumatic actuator. The pneumatic actuator must realize position preservation with the help of a set of combined protection system.
The disadvantages of electric actuator mainly include:
The actuator and regulating mechanism of pneumatic actuator are a unified whole, and its actuator has two types: membrane type and piston type. The piston type has a long stroke, which is suitable for occasions requiring large thrust; The film type has a small stroke, which can only directly drive the valve stem. Due to the advantages of simple structure, large output thrust, stable and reliable action, safety and explosion-proof, pneumatic actuator is widely used in power plants, chemical industry, oil refining and other production processes with high safety requirements.
Main advantages of pneumatic actuator:
Electric valve
Electric actuators are mainly used in power plants or nuclear power plants, because a smooth, stable and slow process is required in the high-pressure water system. The main advantages of electric actuator are high stability and constant thrust that can be applied by users. The thrust generated by the maximum actuator can be as high as 225000kgf. Only hydraulic actuator can achieve such a large thrust, but the cost of hydraulic actuator is much higher than that of electric actuator. The anti deviation ability of the electric actuator is very good, and the output thrust or torque is basically constant, which can well overcome the unbalanced force of the medium and achieve the accurate control of process parameters. Therefore, the control accuracy is higher than that of the pneumatic actuator. If the servo amplifier is used, the exchange of positive and negative effects can be easily realized, and the off signal valve position state (hold / fully open / fully closed) can be easily set. In case of fault, it must stay in the original position, which can not be done by the pneumatic actuator. The pneumatic actuator must realize position preservation with the help of a set of combined protection system.
The disadvantages of electric actuator mainly include:
- The structure is more complex and more prone to failure, and due to its complexity, the technical requirements for on-site maintenance personnel are relatively higher;
- The motor should generate heat during operation. If it is adjusted too frequently, it is easy to cause the motor to overheat and generate thermal protection. At the same time, it will also increase the wear of the reduction gear;
- The operation is slow. It takes a long time from the output of a signal from the regulator to the response of the regulating valve to the corresponding position. This is where it is inferior to pneumatic and hydraulic actuators.
The actuator and regulating mechanism of pneumatic actuator are a unified whole, and its actuator has two types: membrane type and piston type. The piston type has a long stroke, which is suitable for occasions requiring large thrust; The film type has a small stroke, which can only directly drive the valve stem. Due to the advantages of simple structure, large output thrust, stable and reliable action, safety and explosion-proof, pneumatic actuator is widely used in power plants, chemical industry, oil refining and other production processes with high safety requirements.
Main advantages of pneumatic actuator:
- Receive continuous gas signal and output linear displacement (continuous electrical signal can also be accepted after power on / gas conversion device), and some can output angular displacement after equipped with rocker arm.
- It has positive and negative functions.
- The movement speed is high, but the speed will slow down when the load increases.
- The output force is related to the operating pressure.
- High reliability, but the valve cannot be maintained after the air source is interrupted (it can be maintained after adding the holding position valve).
- It is inconvenient to realize sectional control and program control.
- Simple maintenance and good adaptability to the environment.
- High output power.
- It has explosion-proof function.
