PIANC Smart Rivers 2022

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Control valve is the special core equipment of hydro-driven ship lift, it is similar to the electric motor of the electric driven ship lift, which is the key to the safe and efficient operation of ship lift. Hydro-driven ship lift requires very high performance of control valve. It not only needs to control the flow accurately, but also to meet the needs of large flow. At present, only plunger valve and cone valve can meet the operation requirements. It is difficult to avoid cavitation for control valve to work under high pressure difference. How to control the erosion and destruction of valves and pipelines caused by cavitation is related to the operation safety and efficiency of hydro-driven ship lift. Sudden expansion of pipe behind the valve is a simple and efficient valve cavitation suppression technology. Aiming at typical control valves (plunger valve and cone valve), this paper uses physical model tests and theoretical analysis to study the effect of sudden expansion of pipe behind the valve on the flow resistance characteristics of valves, and comprehensively consider the effects of valve type, flow pattern, and flow pulsation. According to the analysis, the relationship between sudden expansion ratio of the pipe and valve flow coefficient is obtained, and the test results are in good agreement with the theoretical analysis. Based on the theoretical analysis and considered the effect of cavitation defense,the expansion ratio for this type of abrupt expansion pipe is suggested to be 3.00.This study has guiding significance for the anti-cavitation technology of industrial valves, and can be used as a reference for the design of pipelines for water delivery and pressure regulation projects.

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