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Title: Theory And Operation Of Pilot Controls
Author: R. H. Welker
Source: 1975 Appalachian Gas Measurement Short Course
Year Published: 1975
Abstract: It is important for gas men who work with pneumatic controllers on a day to day basis to really understand them. Not to understand the controller under these circumstances can be a continual burden to the operator in addition to presenting circumstances for an operation of lower quality than generally desired. Therefore, the objective of this paper is to try to help develop an understanding and attitude toward a device that is absolutely essential to gas control. When we speak of controllers, we want to differentiate them from the Pilot type of control. In general terms a pressure controller is a separate unit from the control valve, and it has constant bleed to atmosphere. Again in general terms we think of pilot controls as being an integral part of the control valve and that has a downstream bleed. What is the difference in these two types of controls? One important difference is the fact that the pilot system can never match the efficiency of a pneumatic controller because it is the controller which contains reset, the function that keeps our process on set point regardless of changes in upstream pressure or load.

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