Hydraulic characteristics test of plunger control valve
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Abstract:
Plunger control valves are widely applied in water diversion projects, and thus the design of hydraulic characteristics of valves becomes important. Flow path optimization and simulation calculation are two hydraulic characteristics of valves that are mostly studied, while the research on valves setting elevation is scarce. Therefore, it is necessary to optimize the hydraulic characteristics of the valve's internal flow path, determine the reasonable setting elevation of valves, and eliminate cavitation and vibration during valve design.This study focused on improving the operating conditions of valves and determining the reasonable setting elevation of valves, to prolong the service life of valves. The mechanical criterion of hydraulic turbine cavitation was utilized, and the formula for calculating the valves setting elevation was derived. In addition, the hydraulic design of valves was verified by collecting the operating data of the in-line valve and drawing the flow coefficient-opening characteristic curve of a real hydraulic turbine, which was later used to guide the field operation.The results show that the measured flow coefficient is consistent with the designed curve when the opening of the valve is above 45.3%, which verifies the correctness of the hydraulic design of the valve. However, in the small opening section of the valve, the deviation between the measured flow coefficient and the designed curve is slightly larger. In the field test, the valve runs smoothly, and the noise is less than 90 dB (A), with the vibration fluctuating in a small range.The safe and smooth operation of the valve is ensured by optimizing the hydraulic design of the valve and determining the reasonable setting elevation of the valve. The cavitation, vibration, and noise of the valve are reduced, and the service life of the valve is extended. In addition, the field test of valve performance further verifies the rationality of the design of hydraulic characteristics of valves.
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