Closing law of ball valves based on water hammer protection

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (21) : 41-45.

PENG Likun，QU Duo , XU Wenqi，CHEN Jia

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Abstract

Aiming at problems of serious water hammers caused by closing ball valves in a ship trim balanced water transfer system, a test system including electro-hydraulic ball valve and digital stepping ball valve was built.Using the method of CFD valve-closing water hammer calculation combined with test study, influences of several valve-closing laws on system water hammer characteristics were analyzed.The results showed that compared with the single linear valve-closing law, the two-stage (first quick then slow) linear valve-closing law can effectively relieve pressure oscillation after fully closing valve; however, too large angle of quick valve-closing stage may cause water hammer pressure to rise, while smaller angle of quick valve-closing stage may cause the water hammer protection effect to be weak; here, the two-stage valve-closing law with quick-closing angle of 45% and the quick-slow speed ratio of 1.6 has a better water hammer protection effect.

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ball valve / CFD / water hammer protection / valve-closing law / UDF

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PENG Likun，QU Duo,XU Wenqi，CHEN Jia. Closing law of ball valves based on water hammer protection[J]. Journal of Vibration and Shock, 2018, 37(21): 41-45

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