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Title: Pressure Relief Valves As Applicable To The Gas Transmission Industry
Author: Roger Paul Wistner
Source: 1971 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1971
Abstract: The Relief Valve is not a new device. It has been used for years as a means of preventing over pressuring vessels and piping systems. The ASME Boiler and Pressure Vessel Code has classified the Relief Valve into three categories. They a redefined as Safety Valves, Relief Valve, and Safety Relief Valve. SAFETY VALVE: An automatic pressure relieving device actuated by the static pressure upstream of the valve and characterized by full opening pop action. It is used for gas Or vapor service. RELIEF VALVE An autcMnatic pressure relieving device actuated by the static pressure upstream of the valve which opens further with the increase in pressure over the opening pressure.

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