How to select pneumatic actuator?

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Pneumatic actuators are often used as actuators installed on the valve, pneumatic ball valve is called pneumatic ball valve, pneumatic actuator butterfly valve is called pneumatic butterfly valve.

How to select pneumatic actuator?

Pneumatic actuatorOften used as an actuator installed on the valve to use, installed on the pneumatic implementation of the ball valve called pneumatic ball valve, installed on the pneumatic actuator of the butterfly valve called pneumatic butterfly valve. To make its work efficiency greatly improved, so how can we make the correct selection of pneumatic actuators?
According to industry insiders, the following aspects should be considered when selecting pneumatic actuators:
A. Air supply pressure or power supply voltage of the actuator;
B. The operating torque of the valve plus the safety factor recommended by the manufacturer/according to the operating conditions;
C. Type of pneumatic actuator: double effect or single effect (spring return) and output torque under certain air source or output torque under additional voltage;
D, its steering and fault form (fault open or fault off) the correct choice of an actuator is very important, such as the actuator is too large, the valve stem may be too large force. On the contrary, if the actuator is too small, the side cannot produce enough torque to fully operate the valve. The torque required to operate the valve comes from the friction between the metal parts of the valve and the seal. According to the valve application occasions, the use of temperature, operating frequency, pipeline and pressure difference, active media (lubrication, drying, mud), many factors affect the operating torque.
How does the pneumatic actuator drive the pneumatic ball valve and control the opening (angular stroke is the point of view)?
The switch type pneumatic ball valve is usually completed by the solenoid valve (or limit switch).
Adjustable pneumatic ball valve, generally complete with valve positioner. The valve positioning reaction rod is connected with the valve stem. By comparing the reaction signal with the system control signal, the ball valve moves in the direction of reducing the difference, and then achieves accurate control.