Aiming at the influences of different parameters on the hydraulic pressure of high-speed switching valves, the transient numerical simulation of the flow field in the valve was carried out by using computational fluid dynamics(CFD) technology. Under non-cavitation and cavitation conditions, the effects of pressure difference, back pressure and temperature on the hydraulic pressure of the valve cores were investigated respectively, and the cavitation flow field characteristics and the evolution of the hydraulic pressure of the valve cores under different opening degrees were revealed. The working conditions with severe cavitation were selected to explore the correlation between cavitation fluctuation and hydraulic pressure oscillation. The results show that with the increase of opening degree, the hydraulic pressure on the spool decreases. With the increase of pressure difference, the pressure drops of valve cores under non-cavitation conditions are much larger than that under cavitation conditions, especially under 6 MPa and 10 MPa pressure difference. The increase of back pressure restrains the occurrence of cavitation to a certain extent, which makes the liquid pressure during cavitation decrease approximately linearly, but almost does not affect the liquid pressure under non-cavitation. The increase of temperature makes cavitation more likely to occur under small opening, and the evolution of liquid pressure under cavitation is smoother. On the other hand, the bubbles generated by the cavitation of the valve ports are discharged from the valve body in an asymmetric ‘piston’ characteristic, which causes the bubble volume in the valve to oscillate periodically at the main frequency of 1355 Hz, and further induces the head of the valve core and the overall hydraulic pressure to fluctuate at the same main frequency.
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