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Title: Operation And Maintenance Of Rubber Plug Type Regulators
Author: R. H. Welker
Source: 1969 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1969
Abstract: A rubber plug as the inner valve of a regulator was first introduced in 1958 to provide unique features that were unobtainable with the regulators of that day. This is a regulator designed specifically for the Natural Gas Industry, which provides a straight and streamlined flow path for the gas in every position of the inner valve. By being able to handle the flow of gas, after the point of regulation, in a straight line and with no sharp abutments after the point of regulation, it is possible to offer a quieter regulator operation in addition to maximum capacity for a given opening and less possibility of cutting. Notice that these features are just a result of the streamlined flow path and that there are even more important considerations in the regulators operation as a result of the rubber plug. One of these would be the type of positive shut off that is possible with a large and resilient rubber plug, another is that, due to the rubber plugs being able to assume an indefinite number of shapes, it gives the regulator the ability to control throughout its entire capacity range in every size.

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