体积突然增大，油中气泡体积这种急速改变的现象。气泡体积的突然改变会产生噪声，又由于这一过程发生在瞬间，将引起局部液压冲击而产生振动。先导式溢流阀的导阀口和主阀口，油液流速和压力的变化很大，很容易出现空穴现象，由此而产生噪声和振动。
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