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Title: Theory And Operation Of Pneumatic Controllers
Author: George French
Source: 1985 Appalachian Gas Measurement Short Course
Year Published: 1985
Abstract: The first step in evaluating a piece of equipment is to assess the need for the device. In the case of the pressure controller, we are looking for a device that will accurately, safely and economically control pressure. The alternative we have is to place an operator on a manual valve and have him throttle that valve to attain the desired downstream pressure. Although the operator, gifted as he may be, tries to control this pressure, he will not satisfy the criteria of accurate economic control. In essence, the reason for automatic control is to improve on the manual techniques available.

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