In jet oil hydraulicspool 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。
2
At present, hydraulicvalve 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。
3
The paper USES spoolvalve system drawing equivalent to cartridge valve system drawing to design a typical hydraulic closed-circuit system consisting of two-way cartridge valve.