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Title: Pressure Regulators And Flow Controllers With Expansible Tube Type Valves
Author: F. H. Wehrman
Source: 1955 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1955
Abstract: It has been said that there has been, in fact, few basic changes in regulator design in the past 50 years. Much has been written of the four basic elements of a regulator, the third element is usually described as a movable valve. Basic patents on thsi movable valve or inner valve were granted some 85 to 90 years ago. Few changes have been made - these changes have been along the line of v-notch and specially contoured types of inner valves, better methods of guiding and better materials. However, basically the design has remained unchanged even though the number of manufacturers has multiplied.

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