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Experimental Study of Operating Parameters for Pneumatic Control Valve in Abnormal Conditions

공기구동 제어밸브 비정상상태 운전변수에 관한 실험적 연구

Kim, Yang-seok;Kim, Dae-woong;Lee, Byoung-oh;Jeoung, Rae-hyuk;Lee, Seung-ho
김양석;김대웅;이병오;정래혁;이승호

  • Received : 2016.01.29
  • Accepted : 2016.04.25
  • Published : 2016.06.01

Abstract

A pneumatic control valve performs a major role in controlling the flow of a system or the level of a key tank in many power plants, and its performance should be guaranteed during the plant's lifetime. Its operation starts by supplying air to the pneumatic actuator or by exhausting the air from the actuator. To control the valve position, the amount of air supply or exhaust is adjusted by a control loop where various accessaries are equipped. In this paper, air leakage in the air supply line, changes in the valve packing force, and false adjustments of zero and the span of the positioner are simulated and analyzed using a 2-in pneumatic valve with a position control loop including an I/P converter and positioner, where the valve position is controlled within ${\pm}2%$ of the control pressure at 67% opening position.

Keywords

Pneumatic Actuator;Control Valve;Positioner;Diagnostics

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