How does pneumatic actuators work? Can you control the opening and closing angles of the valve?

Pneumatic actuators work by pneumatic pressure, such as pneumatic proportional valves, pneumatic ball valves and pneumatic diaphragm valves.

The control of valve opening generally refers to the angle of valve rotation, and can also be controlled by the pressure of air source. However, this kind of valve with switching angle has limited accuracy in flow control, so proportional valve is generally used in industry, which can automatically control the pressure of air source and pneumatic actuator according to feedback, and the control is very accurate. Control mechanisms and actuators are commonly used in industry to achieve control purposes.

There are also many electric actuators in the market, which control the valve body by stepping motors, but many of them are ignored because the control accuracy can not meet the technical requirements. If we can consider the system with low precision and feedback, the price is cheaper than pneumatic.