Gas Shut-Off Valve Has Plastic Link

Issue 1 and Volume 97.

Gas Shut-Off Valve Has Plastic Link The latest idea in automatic gas shutoff valves is one developed recently by Lieutenant John F. Kelly, of the New York Fire Department, and which uses a release link made of a plastic. This plastic, Vinylite, does not support combustion. It has a tensile strength of 8,000 to 10,000 pounds per square inch, and a softening temperature of from 140 to 150 degrees F. The sketch herewith shows a crosssection of the cut-off valve, and illustrates the various elements of the unit. The valve stem, when valve is open, compresses the coil spring beneath the valve. The valve is held open by the plastic link, or yoke, as shown. When exposed to heat at a fire, the link softens, and breaks, permitting valve stem to rise, thus closing the valve and stopping the flow of gas. The desirability of automatic gas cutoff valves, particularly…

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