Automatic Station Bypass Actuator Control

The “Automatic Station Bypass Control” module is designed to meet the need to keep gas flowing in the event there are major compressor problems. This control solution was developed with reliability as the primary objective to ensure the Bypass Valve opens when, and only when it is necessary. To achieve this objective, the proven “Poppet Valve” is combined with a reliable, differential pilot valve to form a stand-alone control module. The differential pressure valve monitors the suction and discharge pressures of the compressor station. When the differential drops below the adjustable setpoint, pilot gas is passed to the pilot of the “poppet” valve and control action is initiated. Utilizing the pipeline gas itself, for both the pilot gas and power media, makes the “Automatic Station Bypass Control” system independent of regulator and other power media failure. The simplicity of design, utilizing minimal components, ensures the bypass valve opens only when required. The “Rate of Drop” (R.O.D.) calibration kit provides for accurate calibration of the trip point, as well as, simulation of various operational failure scenarios for testing control action.

The Advantage

• Hi-pressure construction – no regulator, relief valve, or mechanical switching valve.
• Differential pilot valve utilizes a stainless steel diaphragm for accuracy and repeatability.
• Marine-grade, hard-anodized aluminum body for both poppet and differential pilot valve.
• Easily adjusted differential trip setpoint (1.5 psi to 14.5 psi).
• No mechanical linkages, which are subject to environmental failure.
• Limit valve ensures complete opening of bypass valve.