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Title: An Emergency Shut-Off Valve Esv() A Progress Report
Author: Raymond A. Day
Source: American Gas Association 1977
Year Published: 1977
Abstract: Control of gas flow is essential for the safe operation of underground gas distribution piping systems. It positive shut-off on a customer service line is required -such as during an emergency- a gas utility may currently employ one or more of a number of ways of controlling gas flow, such as: . . . Operating a curb valve (stop) or. . . . Operating a meter slop, or . . . Operating a saddle lapping tee ai the service line connection on the main, or . . . Squeezing off a plastic service line In an effort to provide another alternative method- an improvement upon current techniques-a remotely-operated multifunction emergency shut-off valve (ESV) has been designed, fabricated and tested. Models of the new design are undergoing laboratory testing, while others are being installed on a pilot basis on plastic service lines by a gas utility lo evaluate performance in the field. This is a progress report on the design and testing of prototype and production model ESVs that will provide a quick, positive shutoff on gas service lines at the main without having to excavate.

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