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。
Because of the high flow resistance and the poor flowing ability, the spool valves can't meet the requirements for high velocity or huge hydraulic equipment.
同时由于滑阀流动阻力大，通流能力小，不能满足高速或大型液压设备对流量的要求。
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。
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