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Title: Relief Valves
Author: Lawrence P. Sipsky
Source: 1984 Appalachian Gas Measurement Short Course
Year Published: 1984
Abstract: The relief valve has been used by the gas industry as a way of providing overpressure protection in transmission, distribution systems, and for individual customer installations. Acting as a self-contained, independent device, a relief valve works by limiting pressure downstream of a gas regulator to a specific, tolerable set point. This of course, should only happen in the event of failure of the regulator to function mechanically, or due to foreign matter in the supply not allowing positive shut off to occur. This would lead to an increase in outlet pressure, possibly to a dangerous level. The relief valve would open, thereby allowing excess gas to be discharged into the atmosphere, thus maintaining safe pressure in the system.

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