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Vol. 177, Issue 8, August 2014, pp. 97-105

 

Bullet

 

The Actuator Fault Diagnosis Based on the Valve Friction
 

Jiajiang Li, * Qunli Shang, Zheng Ding, Yayao Fang, Yang Liu

College of Information Engineering, Zhejiang University of Technology, Hangzhou, 310014, China
* Tel.: 13606709508

* E-mail: qlshang@zjut.edu.cn

 

Received: 18 June 2014 /Accepted: 31 July 2014 /Published: 31 August 2014

Digital Sensors and Sensor Sysstems

 

Abstract: Control valve (actuator) is the frequently moving terminal Instrument of the control system. To avoid the leaking of the actuator, there is packing at the moving parts. However, the friction caused by the packing can do harm to the control of the system. The washing effect of the media, high temperature, high pressure, frequent movement and other effects can result in the leaking of the packing and the deformation of the valve stem, which causes the change of the friction. The study of the control of the friction has always been an interesting topic in the industry. In this paper, we theoretically analyze the relationship of the friction of the packing and the static performance of the control valve, and offer a method to check the quality of the moving parts by attaching a strain gage (strain rosette) to the empty part of the valve stem. This method has been demonstrated via experiment and a method to do error detection is provided at last.

 

Keywords: Control valve, Fault diagnosis, Static performance, Packing friction.

 

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