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Title: New Trends In Rubber Plug Type Control Valves
Author: Robert H. Welker
Source: 1977 International School of Hydrocarbon Measurement
Year Published: 1977
Abstract: The newer of the rubber plug type of regulators (i.e., control valves), like its earlier counterpart, is a pneumatic, hydraulic design that utilizes conventional instruments to operate its diaphragm motor which, in turn, manipulates the solid rubber plug type of inner valve. The power of the motor is connected to the inner valve through hydraulic linkage to provide the power needed without introducing friction. Depending on the size of the regulator, an instrument output will be required that is related to the size of the regulator and the pressures that it is working with. For example, a conventional regulator normally works with the output from the controller starting at 0 PSI and going to whatever pressure is needed to give a positive shutoff.

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