三、流量控制阀这种阀是通过调节通流面积,完成对执行元件的速度调节的。它有节流阀和调速阀两种。1.节流阀与单向节流阀图3-18是一种节流阀的结构原理图。它依靠改变通流缝隙实现流量调节。图3-19是单向节流阀,逆流时不节流。节流阀调好后,流量易受压力波动的影响。因为流量与进出口的压差有关,压差大时 Third, the flow control valve This valve is through the regulation of flow area, the implementation of components to complete the speed adjustment. It has two throttle and speed control valve. Throttle and one-way throttle Figure 3-18 is a throttle structure diagram. It relies on changing the flow through the gap to achieve flow regulation. Figure 3-19 is a one-way throttle, not throttling counter-current. When the throttle valve is adjusted, the flow is easily affected by pressure fluctuations. Because the flow and the pressure on the import and export, when the pressure difference is large