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Title: A Vernier Valve Natural Gas Regulating System
Author: Ralph A. Barbakoff
Source: American Gas Association 1979
Year Published: 1979
Abstract: The Vernier Valve Control System provides the capability of controlling large changes in flow gas requirements with only two parallel piped regulator valves. This system was developed to replace the conventional muiti-run regulator systems previously used ai The Peoples Gas Light & Coke Company Gate Stations. With this system pressure or flow control operation is obtainable using commercially available pneumatic or electronic analog instrumentation. Therefore, both pneumatic and electronic controllers may be incorporated in single system, one being used as back-up for the other. Response times of under one minute are being obtained for set point changes of 5 percent or less with system turn down ratios of 200 to t which is a control accuracy of less than .5 percent deviation between process and set point.

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