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Title: Theory And Operation Of Pilot Controls
Author: Robert C. Lisk
Source: 1968 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1968
Abstract: In any attempt to describe the behavior of a mechanism, it may be necessary to ignore some characteristics of that mechanism so as to avoid an intolerable confusion. This does not mean to imply that a pilot controlled regulator is a hopelessly complex device. At the same time, we can better approach an understanding of how it works if we hold some quantities constant which are never truly so, and if we ignore certain facets of behavior which do make themselves quite obvious in real life. In this discussion we choose to proceed as if the area of a flat sheet diaphragm stayed the same throughout the travel of the valve plug. Actually, the area varies and in such a way as to augment spring effect with which we shall deal at some length. We choose to ignore ths transient effects upon pressure of an upset in operating conditions. We cant do this if we wish to have a worthwhile grasp of pilot controlled regulator behavior.

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