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Title: Direct Or Pilot Operated Regulators A Choice To Be Made
Author: Kenneth C. Depew
Source: 1975 Appalachian Gas Measurement Short Course
Year Published: 1975
Abstract: The models and types of regulators and regulator control systems which we now use at Public Service are to a large degree the product of our companys past practice, past practice that was determined by the old basic requirements of large low pressure mains supplied by an intermediate pressure system operating from 2 to 7 lbs. per sq. in. Industrial regulators also were large and supplied gas at approximately 5.0 w.c. Until the early 1960s the system was predominantly manufactured gas at 604 BTU/cu. ft. Before I discuss some specific installations and their method of operation, I would like to list and define several terms which are used within Public Service, but which may or may not be understood by others: Fail open regulator-A regulator whose body configuration is such that the spring or other loading mechanism will tend to make the regulator open wide.

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