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Title: Lubricated Plug Valve Maintenance & Repair
Author: G. Keith George
Source: 1977 Western Gas Measurement Short Course
Year Published: 1977
Abstract: As. e ol( a type of valve, the plug valve is the oldest style of valve on which we have been able to trace a history. Plug valves have been around for about 3200 years. The original plug valve was a piece of wood that had a hole bored in it. This was inserted in a pieceofpipe, which was then hollowed out bamboo, and when you turned that plug so that the hole in it was in line with the hollow portion of the bamboo (the run of the pipe) you got flow. When you rotated the plug 90 degrees, so that the solid portion was in 1ine with the run, the flow stopped.

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