Page 317 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Pneumatic actuator Valve
A pneumatic actuator converts pneumatic energy into mechanical energy which controls a final control element
such as a control valve according to the received control signal. The pneumatic actuator used to operate the con-
trol valve is called pneumatic actuator valve. Normally in industries, pneumatic systems use air pressure of (80 to
100) PSI for their operation. Actuator valves primarily consist of a diaphragm or a piston surrounded by a metallic
enclosure and a stem attached to the diaphragm or piston which can be connected to the valve stem through a
coupling. They can have either a single pneumatic signal port with a spring return mechanism which is referred
to as a single acting actuator or it can have a double pneumatic signal port which is referred to as a double act-
ing actuator. Apart from this, according to the valve type, linear or rotary actuator is connected. The diagram of a
simple pneumatic actuator valve is shown below-

Pneumatic Actuator Valve

Types of pneumatic actuators
The pneumatic actuator uses the energy of compressed air for its operation. They can be classified as described
below-

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CITS : E & H - Electronics Mechanic - Lesson 188 - 198