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Title: Pilot Operated Relief Valves
Author: G. Frank Bright
Source: 1969 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1969
Abstract: In recent years the operational requirements for most mechanical equipment for the natural gas industry have become more and more demanding. Safety relief valves -- as a small but necessary part of this equipment - have not been immune from these demands. Operating pressures have been pushed steadily upward toward the maximum allowable, causing a need for valves that will operate with a minimum gap between operating pressure and set point. AAany stations are now unattended - or only partially attended - requiring valves that can go for long periods of time with a minimum of maintenance. These valves may also be required, not only to operate as safety valves, but are often tied into a remote control system-- and thus must be so designed that they can be opened by a signal from miles away. A single main line safety valve may be protecting 50 to TOO miles of large diameter pipe which is thin wall and highly stressed. A valve in this service is required to go fully open at its set point- -since permitting overpressure could cause a rash of leaks - ond then reseat extremely close to set point before thousands of dollars worth of gas is vented from the line. Valves on compressor discharge systems must withstand continual pressure pulsation and mechanical vibration, yet be trouble-free and open when called upon to relieve. Conditions such OS these have placed increased importance on sound engineering selection of safety valves and have generated much interest both on the port of users and manufacturers In the development of new products which will do these jobs better.

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