Reliability Evaluation of Concentric Butterfly Valve Using Statistical Hypothesis Test

통계적 가설검정을 이용한 중심형 버터플라이 밸브의 신뢰성 평가

Chang, Mu-Seong;Choi, Jong-Sik;Choi, Byung-Oh;Kim, Do-Sik

  • Received : 2015.07.24
  • Accepted : 2015.10.29
  • Published : 2015.12.01


A butterfly valve is a type of flow-control device typically used to regulate a fluid flow. This paper presents an estimation of the shape parameter of the Weibull distribution, characteristic life, and $B_{10}$ life for a concentric butterfly valve based on a statistical analysis of the reliability test data taken before and after the valve improvement. The difference in the shape and scale parameters between the existing and improved valves is reviewed using a statistical hypothesis test. The test results indicate that the shape parameter of the improved valve is similar to that of the existing valve, and that the scale parameter of the improved valve is found to have increased. These analysis results are particularly useful for a reliability qualification test and the determination of the service life cycles.


Concentric Butterfly Valve;Reliability Evaluation;Leakage;Shape Parameter;Statistical Hypothesis Test


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