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Title: Elimination Of Bleed Gas From Control Valve Instrumentation
Author: Steve Mcfarlin
Source: 2001 Western Gas Measurement Short Course
Year Published: 2001
Abstract: Natural gas pipeline control valve stations utilize the most economical and reliable resource available to power the control valve actuators and instrumentation. In most cases the most readily resource is the natural gas in the pipeline itself rather than compressed air or electrical sources. The actuator and control instrumentation used are pneumatically operated. In order for the actuator to operate the control valve, the gas must be loaded and exhausted from the actuator cylinder or diaphragm through control instrumentation. The control instrumentation typically bleeds off excess pressure not required by the actuator to the atmosphere. It is the bleeding gas from control valve instrumentation that results in drastic repercussions in several areas.

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