A common air pressure applied to the supply of a pneumatic controller is:

In pneumatic control systems, the typical air pressure applied to the supply of a pneumatic controller is often around 15 to 20 psig. This range is generally accepted because it provides sufficient force and responsiveness in actuators while also ensuring that the components operate efficiently.

The choice of 18 psig reflects a balanced operational pressure that allows for effective control without overloading the system or the components used in it. Pneumatic controllers are designed to function optimally within specific pressure ranges, and 18 psig offers a practical middle ground that accommodates typical variations in applications. This pressure ensures that the system can maintain actuations and control processes effectively, providing reliable performance in various operational conditions.

In contrast, lower pressures, such as 10 psig, may not supply enough force for effective operation in many applications, leading to sluggish controller response. Higher pressures, like 20 psig, while sometimes used, can introduce potential risks of overpressure and increased wear on components. Therefore, targeting a pressure around 18 psig is advantageous for maintaining correct operation without the downsides of excessively high or low pressure.