到达电磁先导阀的P口，通过电磁先导阀的换向及调整节流阀的开度，来实现主阀芯的换向延时，从而达到降低主油路与执行元件接通时的换向冲击。但先导电磁阀断电时、弹簧复位型电液换向阀主阀体两端盖内的液压油会通过先导电磁阀的中位与泄油口接通、主阀芯在复位弹R900757849 2FRM 6 A36-3X/0,2QMV 
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R900205525 2FRM 6 B76-3X/32QMV 
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R900739151 2FRM 6 SB76-3X/32QRV 
R900424887 2FRM 10-3X/10L 
R900427774 2FRM 10-3X/10LV 
R900423250 2FRM 10-3X/10LB 
R900440368 2FRM 10-3X/10LBV 
R900423251 2FRM 10-3X/16L 
R900423253 2FRM 10-3X/16LV 
R900423252 2FRM 10-3X/16LB 
R900437694 2FRM 10-3X/16LBV 
R900423255 2FRM 10-3X/25L 
簧的作用下会立即复位，由于主阀芯复位快、亦即切断执行元件油路的速度快、从而引起液压冲击。由此可见，叠加一个P口可调节流阀，只能实现换向接通延时、不能解决复位切断延时。注：象油缸类的执行元件，油缸前进与后退时通过换向阀的流量是不一致的R900337143 2FRH 10-3X/25LV 
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R900201438 2FRW 16-3X/100L6EYW230N9K4 
R900224268 2FRW 16-3X/100LP6EJG24N9K4 
R901192165 2FRW 16-3X/100LB6EJG24N9K4 
R901041645 2FRW 16-3X/100LB6EJG24NK4 
R900745111 2FRW 16-3X/100LB6EYG24N9K4 
R900229233 2FRW 16-3X/100LB6EYW230N9K4 
R900715556 2FRW 16-3X/100LBP6EJG24N9K4 
R900745805 2FRW 16-3X/100LBP6EJG24N9K4V 
R901033766 2FRW 16-3X/100LBP6EYW230N9K4 
R900990958 2FRW 16-3X/160L6EJG24N9K4 
R900990997 2FRW 16-3X/160L6EJG24N9K4V 
R901098218 2FRW 16-3X/160L6EJG24NK4 
R901119683 2FRW 16-3X/160L6EJW230N9K4 
R900088789 2FRW 16-3X/160L6EYG24N9K4 
R900768587 2FRW 16-3X/160L6EYG24N9K4V 
R900727526 2FRW 16-3X/160L6EYW230N9K4 
R900227987 2FRW 16-3X/160LP6EJG24N9K4 
R900227254 2FRW 16-3X/160LB6EJG24N9K4 
，油缸无杆腔与有杆腔的面积比越大、流量差距也越大，此时若想较满意的降低执行元件前进与后退时的液压冲击，通过一个可调节流阀，恐怕是难以实现的。R900427522 2FRM 10-3X/25LBV 
R900420286 2FRM 10-3X/50L 
R900427776 2FRM 10-3X/50LV 
R900423261 2FRM 10-3X/50LB 
R900424898 2FRM 10-3X/50LBV 
R900423271 2FRM 16-3X/60L 
R900424904 2FRM 16-3X/60LV 
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R900424905 2FRM 16-3X/100L 
R900429596 2FRM 16-3X/100LV 
R900420287 2FRM 16-3X/100LB 
R900471183 2FRM 16-3X/100LBV 
R900424906 2FRM 16-3X/160L 
R900427777 2FRM 16-3X/160LV 
R900424902 2FRM 16-3X/160LB 
R900424034 2FRM 16-3X/160LBV 
2FRM型调速阀是两通的流量控制阀，此阀是由减压阀和节流阀串联构成的。油流进入调速阀后，先经过减压阀减压，再由节流阀节流。由于减压阀对节流进行压力补偿。所以调速阀的流量不受负载变化的影响，保持稳定。同时节流窗口设计成薄刃状，流量受温度变化很小。调速阀和单向阀并联时，油流能反向回流
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力士乐RexrothR900241525 2FRM6A36-3X/0,6QMV
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RexrothR900212586 2FRM6A36-3X/25QMV 
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