At present, hydraulic valve has the deficiency of inadequate interchangeability and machining difficulty of unsymmetrical valve spool.
目前，液压阀存在互换性差、不对称阀芯的设计加工困难等不足。
In jet oil hydraulic spool valves, the oil flows through a rush path because of the shape changing of the valve.
流体在通过直喷式柱型液压控制阀阀芯时，阀内形状的变化使流体的运动量发生变化。
The power stage of servovalves is spool valve, playing the role of hydraulic pressure amplifier.
电液伺服阀的功率级一般为滑阀，起液压放大器的作用。
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