Because velocity of flow reduces when the pressure pulse reduces, the noise of impulsion and the noise of vortex increase a little.
因为压力脉动减小导致流速增加，从而使冲击噪声和涡流噪声略有增加。
The load method of the system is that installing a throttle ahead of a proportional overflow valve, and the throttle can prevent the effect of the pressure impulsion upon sensors and meters.
本论文所述系统的加载方法是在比例溢流阀前装一个节流阀，利用节流阀来阻止溢流阀产生的压力冲击对传感器及仪表的影响。
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