液压阀的喷流噪声,是指液压油流过阀口时由于节流作用,产生高速喷流而引起的涡流声和气穴声。本文对涡流、气穴的形成,涡流场压力、流速的分布及涡流剪切剥离流量进行了理论分析和计算;根据噪声源的一般特性,分析了液压阀高速喷流时声源的组成,并提出了高速喷流时辐射声级最高的气穴噪声发生的过程和方程及降低液压阀喷流噪声的措施。 Hydraulic valve jet noise, refers to the hydraulic oil flow through the valve port due to throttling effect, resulting in high-speed jet caused by vortex sound and cavitation sound. In this paper, the formation of vortex, cavitation, eddy current pressure, flow velocity distribution and eddy current shear stripping flow were theoretically analyzed and calculated; According to the general characteristics of the noise source, the composition of the sound source of the high-speed jet valve was analyzed The process and equation of cavitation noise with the highest radiation level and the measures to reduce the jet noise of the hydraulic valve are proposed.