Pneumatic control valve is compressed air as the power source, with pneumatic actuators, and electric control valve is composed of electric actuator and control valve connection combination. It is easy to see the choice of pneumatic control valve and electric control valve actuator is different. The following pneumatic control valve and electric control valve in the power, use, maintenance and other aspects of comparison:

      Pneumatic control valve action force than the electric control valve large, pneumatic valve switch action speed can be adjusted, simple structure, easy maintenance, action process due to the gas itself, the buffer characteristics, not easily damaged due to stuck, but must have gas source, and The control system is also more complex than the electric valve. Pneumatic valves are responsive, safe and reliable, and many of the plants with high control requirements are equipped with compressed air stations for pneumatic instrument control components. Electric is to electricity.
The essential difference between an electric control valve and a pneumatic control valve is the use of different actuators, that is, the actuator, and the control valve itself is no different. With the implementation of different operating agencies are mainly working conditions, such as chemical and other requirements of the explosion-proof occasions, the most used is the pneumatic valve, because the security requirements are high, and cheap, with intelligent positioning device can be on the bus, the control is simple.
Electric valve actuator power source for the power supply, if the circuit board or motor failure prone to sparks, so the general application of the environment is not high and no danger of the occasion.
      Pneumatic valve actuator power source for the gas source, air source from the air compressor, the use of positioner to control the electronic control signal into a pneumatic control signal to drive the pneumatic actuator to adjust the valve position.
Pneumatic actuators and electric actuators to adjust the performance comparison, pneumatic actuator response faster, more suitable for the application of the adjustment conditions, so the production of regulating valve manufacturers are also supporting the implementation of pneumatic actuators. The actuating mechanism of the electric actuator is not fast enough to respond, so the pneumatic actuators on the regulating valve are more than the electric actuator.
Late use, maintenance costs are much higher than the electric valve.