5. Accessories
5.0. Introduction
Major accessories required for satisfactory operation of actuators is necessary. Table VI/5.0-1 outlines the functionalities of these items. Based on the function desired, a designer can choose the required ones for a particular application.
5.1. AFR
In a power plant there is one common instrument air pressure line throughout the plant. This pressure is generally kept close to 7 kg/cm2g, whereas the air supply requirements for control valves, power cylinders, and I/P converters vary (see Table VI/5.3.1-1). AFR is used to supply air to the pneumatic device at the required pressure. The other main function of AFR is to remove oil, moisture, and other contaminants from the air supply to save the costly pneumatic instruments/actuators. ...
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