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Title: BASIC PRINCIPLES OF PILOT OPERATED FLEXIBLE ELEMENT REGULATORS
Author: Michael Garvey
Source: 2022 Appalachian Gas Measurement Short Course
Year Published: 2022
Abstract: Pilot Operated Flexible Element Regulators are capable of providing very accurate control in natural gas trans- mission and distribution pipelines. The Pilot Operated Regulator provides advantages over both self-operated regulators and control valves. Primary benefits include simplicity of operation and elimination of any fugitive emissions caused by atmospheric bleed gas. However, it is important to recognize the limitations of the pilot operated flexible element regulator and apply it accord- ingly. The original Flexible Element Regulator, the Flex- flo, was developed by the Grove Valve and Regulator Company circa World War II. The original intent for the regulator was to regulate water in submarine ballasting systems. However, Grove quickly recognized that the Flexflo regulator product was ideally suited for pres- sure control applications in natural gas pipelines. Many advances have been made since the original Flexible Element was created more then fifty years ago, but the same basic operational advantages and principles of op- eration remain unchanged.

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