The essential difference between electric valves and pneumatic valves is the use of different drives, that is, actuators. So there is no difference in the control valve itself. With different implementing working conditions, such as chemical requirements of explosion-proof occasions, the pneumatic valve is the most used. Because of the high security requirements and low price with the intelligent positioner, the control method is simple.
Electric valve actuator is the power supplied. If the circuit board or motor fails to sparks, it is generally used in the environment that is less demanding and not dangerous situations. Pneumatic valve actuator power source is the air source which is from the air compressor. It uses a positioner to convert electrical control signals into pneumatic control signals and actuates pneumatic actuators for valve position adjustment.
Comparing the performance of pneumatic actuators and electric actuators, the pneumatic actuator has faster response and can be more suitable for use in regulating conditions. Therefore, the production of valve manufacturers, are also producing pneumatic actuators to support Pneumatic valve action torque is longer than the electric valve. Pneumatic valve switching speed can be adjusted, and the structure is simple and easy to maintain. Due to the cushioning property of the gas itself during the operation, it is hard to be damaged by the jamming. But it must have gas source, and its control system is also more complex than the electric valve.