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Title: Pipeline Valve Business-Past, Present, And Future
Author: John P. Tescher
Source: American Gas Association 1985
Year Published: 1985
Abstract: Pipelines did not get serious until World War II. Crude and products pipelines, for the first time, became real competitors to the railroads, and natural gas pipelines began to deliver cheap, clean energy to locations far from the wellhead. Early attempts to use scaled up wedge and double-disc gate valve designs lifted from water works and power plants proved generally unsatisfactory due largely to size and pressure differences. The first successful pipeline valve was a plug valve. The lubricated plug valve was a remarkable invention in its day. Similar design plug valves have been discovered in ancient Rome over 2,000 years old. The plug valve with its high pressure capability in a compact envelope and injected sealant or lubricant (this was no problem in the days of cheap maintenance labor) provided good sealing and generally the ability to unstick a valve that hadnt been operated in a long time.

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