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Title: Pilot Operated Plug Valve Regulators For Pressure Control
Author: Joseph A. Bonner
Source: 1970 American School of Gas Measurement Technology
Year Published: 1970
Abstract: The plug valve has been used to throttle fluids since its conception as a valve. This throttling was manual for short durations. The inherent characteristics of the plug valve as a throttling device were not recognized because the normal application of a plug valve was on the typical on-off type service. The increased use of gas and the resulting larger pipelines required more pressure regulating equipment and larger equipment. Conventional throttle valves were available in sizes up to and including 12, and some 16 were available on special order but these were very expensive and had massive top works. The need for a good large regulator forced some operating gas companies to start experimenting with the plug valve as a regulator as far back as the 30s, and there may have been unrecorded earlier attempts. The early experimenters were intrigued with plug valves due to their experience with this type of valve as a manual means of regulating pressure in a pipeline system. In addition, some of these experimenters were faced with the problem of installing large valves for specific controls and the cost of such a system was almost prohibitive,. These early experimenters employed hydraulic power systems and even some electrical power systems. The hydraulic systems were gas-hydraulic or electric-hydraulic and various schemes were devised to control the plug position. Most of the problems associated with these systems were the result of having to start hydraulic pumps and stop them with little or no time delays and also the problem of controlling the speed of the valve operator. The operators were generally piston operators but other types were used also. In the early 50s. additional experimenting was done

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