Visualization Experiment of Vibration and Cavitation in Poppet Valve under Low Pressure Condition

doi:10.3901/JME.2018.20.139

Abstract

Abstract: Poppet valve is commonly used in pressure control valve, additionally, the axial vibration of poppet directly affects regulating precision and working stability of the pressure control valve. In view of pilot-level valve, visual experimental method was used to analyze the vibration process of poppet and the cavitation of valve port when spring pre-compression is constant and opening pressure is under 2.5 MPa. As a result, vibration style of poppet was closely related with flow rate. When flow rate is under 2.0 L/min in unstable vibration, poppet impacted valve seat, the flow at valve port is cut off instantaneously, a mass of bubbles collapse rapidly, and there is obvious rebound phenomenon. When flow rate is greater than 2.6 L/min in unstable vibration, poppet didn't impact valve seat, there is cavitation or non-cavitation at valve port, moreover, the amplitudes of poppet vibration and pressure fluctuation under cavitation are significantly greater than that under non-cavitation. When flow rate is between 2.0-2.6 L/min, the unstable vibration of poppet is in a transition state, in which two phenomena were observed, then, the poppet did or didn't impact valve seat.

Key words: cavitation, high-speed videography, impact, poppet valve, vibration

CLC Number:

TH137

MIN Wei, WANG Dong, ZHENG Zhi, OU Peiwei, JI Hong. Visualization Experiment of Vibration and Cavitation in Poppet Valve under Low Pressure Condition[J]. Journal of Mechanical Engineering, 2018, 54(20): 139-144.

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