Comparison of pneumatic ball valve pneumatic actuator and electric ball valve electric actuator
At present, the commonly used driving mode of regulating valve is pneumatic, electric and electric hydraulic (hydraulic). In daily use, pneumatic valves are powered by air source compression. Common pneumatic ball valve, pneumatic butterfly valve, electric valve, electric ball valve, electric butterfly valve, etc..
Therefore, today Xiaobian will talk about the difference between pneumatic and electric actuators:
1. Pneumatic actuator
Nowadays, most actuators used in industrial control sites are pneumatic actuators, because it is more economical and easier to obtain the air source as power. In terms of routine maintenance, pneumatic actuators are easier to operate and calibrate than other types of actuators, and easier to achieve forward and reverse exchange in the field.
The advantage is security. The valve using the electric actuator may cause fire, and the safety factor of the pneumatic ball valve using the pneumatic actuator is much higher than that of the electric actuator. Therefore, although the electric control valve is more and more widely used, but the pneumatic control valve still occupies an absolute advantage in the chemical industry.
However, the main disadvantages of pneumatic actuators are the compressibility of poor control accuracy, poor control accuracy, poor resistance to deviation, and slow response. Especially when large pneumatic actuators are used, it takes time for air to fill the cylinder and empty, and the corresponding response will be slow.
2. Electric actuator
Since high-pressure water systems require a smooth, steady and slow process, electric actuators are mainly used in power plants or nuclear power plants.
The electric actuator has high stability and constant thrust, and the resistance to deviation of the electric actuator is also very good. The thrust or torque output of the electric actuator is basically constant, so the control accuracy is higher than that of the pneumatic actuator.
However, because it is driven by electricity, the shortcomings of the electric actuator are also obvious. The most obvious point is that the motor runs and generates heat. If the motor is adjusted too frequently, it is easy to generate thermal protection due to the overheating of the motor and increase the wear of the reduction gear. The structure of the electric actuator is complex, which is more prone to failure, and the field maintenance personnel have high technical requirements.
