The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Bounding Value of Valve Performance Parameters for Motor Operated Flexible Wedge Gate Valve

모터구동 Flexible Wedge형 게이트밸브의 밸브 성능인자 Bounding Value에 대한 연구

  • Published : 2007.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

Stem friction coefficient and valve factor are very important parameters for the evaluation of valve performance. In this study, the characteristics of stem friction coefficient and valve factor are analyzed, and thor bounding value is determined. The hydraulic testing is performed for many flexible wedge gate valves in the plant and statistical method is applied to the determination of bounding value. According to the results of this study, stem friction coefficient does not change much with differential pressure, and the bounding value of closing stroke is higher than that of opening stroke. The valve factor of valves with high differential pressure is higher than that of valves with medium differential pressure. It means valve factor is more sensitive to the differential pressure than the stem friction coefficient. Valve factor of the closing stroke is higher than that of opening stroke due to piston effect.

Keywords

References

  1. U.S Nuclear Regulatory Commission., 1989, 'Generic Letter 89-10 Safety-Related Motor Operated Valve Testing and Surveillance
  2. EPRI, 1990, 'Application Guide for Motor Operated Valves in Nuclear Power Plants,' EPRI-NP-6660D, pp. 1-1-11
  3. Kalsi, M. S., Alvarez, P. D., Wang, J.K., Somogyi, D., 1996, 'An Improved Gate Valve for Critical Applications in Nuclear Power Plants,' Fourth NRC/ASME Symposium on Valve and Pump Testing, pp. 1B-55-56
  4. KINS, 2004, 'Development of Regulatory Techniques for Operational Performance Evaluation of Nuclear Power Plants,' pp. 157-180
  5. Chai. J. B., Kang, S. C., Park, S. G., 2004, 'Condition Monitoring of a Motor-Operated Valve Using Estimated Motor Torque,' JSME International Journal, pp. 305-313
  6. Kim, D. W., Yoo, S. Y., 2007, 'Effects of Differential Pressure on the Performance of Motor Operated Flexible Wedge Gate Valve,' KSME Journal B, pp. 151-158, 2007 https://doi.org/10.3795/KSME-B.2007.31.2.151
  7. Guerout, F. M., Pitard-Bouet, J.M., Christophe Jouve, 2000, 'Selection of Greases for Motor-Operated Valve Stem/Stem Nut Lubrication,' Sixth NRC/ASME Symposium on Valve and Pump Testing, pp. 2B-52-53
  8. CRANE Inc., 1998, 'Universial Diagnostic System MOV Data Acquisition Software User's Manual,' pp. 1-3-10
  9. Garza, Ivo A., 1996, 'Evaluation of Existing EPRI and INEEL Test Data to Determine the Worm-to-Worn Gear Coefficient of Friction in Limitorque Actuators,' Fourth NRC/ASME Symposium on Valve and Pump Testing, pp.1B-36-39
  10. Ronald H. D., 1992, 'Measurement Uncertainty Methods and Applications,' Instrument Society of America