Electric valve actuators with electric power source are prone to sparks if the circuit board or motor fails, so they are generally used in situations where the environment is not high and non-hazardous. Pneumatic actuators and electric actuators have better regulation performance. Pneumatic execution The response speed of the actuator is relatively fast, and it can be better adapted to the speed control conditions. Therefore, the manufacturers that produce the control valve all produce the pneumatic actuator for supporting production. 0P6^+x2m2a2AD+G
Taking ROTORK as an example, the adjustment response speed of electric actuators is not fast enough, and the control solenoid valve regulator only has 1,200 adjustments per hour, so the installation of pneumatic actuators on the regulators is more applied than electric actuators.
The fundamental difference between electric valves and pneumatic valves lies in the use of different driving devices, namely actuators, but there is no difference in the regulating valve itself. The cooperation of each actuator is mainly based on working conditions, such as chemical industry and other occasions that require explosion-proof, pneumatic valves are mostly used. Because explosion-proof solenoid valves have high safety requirements and are cheap, they can be connected to the bus with the intelligent positioner, and the control method is simple.
Pneumatic valve has a larger operating force distance than electric valve. It can adjust the operating speed of pneumatic valve switch. The structure is simple and easy to maintain. Due to the cushioning characteristics of the gas itself, it is not easy to be jammed and damaged during the operation, but it must have a gas source and its The control system is more complicated than electric valves.
Pneumatic valves are sensitive, safe and reliable. Many factories with high control requirements have set up compressed air stations for the control components of pneumatic instruments. The power source of the air valve actuator is the air source. The air source comes from the air compressor. The positioner is used to convert the electric control signal to the air conditioner, and the air conditioner is driven to adjust the valve position.