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先导式减压阀调压用的压缩空气，一般是由小型直动式减压阀供给的。若将这个小型直动式减压阀与主阀合成一体，则称为内部先导式减压阀。若将它与主阀分离，则称为外部先导式减压阀，它可实现远距离控制。.
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AR625-10-5,SMC先导式减压阀,smc总代理
顺时针旋转手轮，调压弹簧9被压缩，上膜片组件7推动先导阀芯5开启，输入气体通过恒节流孔4流入上膜片下腔，此气压力与调压弹簧力相平衡。上膜片下腔与下膜片上腔相通，气压推下膜片组件，通过阀杆将主阀芯打开，则有出口压力。同时，此出口压力通过反馈孔进入下膜片下腔，与上腔压力相平衡，以维持出口压力不变。
用压缩空气的作用力代替调压弹簧力以改变出口压力的阀，称为先导式减压阀。它调压时操作轻便，流量特性好，稳压精度高，压力特性也好，适用于通径较大的减压阀。
先导式减压阀调压用的压缩空气，一般是由小型直动式减压阀供给的。若将这个小型直动式减压阀与主阀合成一体，则称为内部先导式减压阀。若将它与主阀分离，则称为外部先导式减压阀，它可实现远距离控制。
先导式减压阀使用注意
1）普通型减压阀，出口压力不要超过进口压力的85%；精密减压阀，出口要压力不要超过进口压力的90%。输出压力不得超过设定压力的zui大值。
2）连接配管要充分吹洗。
3）空气的流动方向按箭头方向安装，不得装反。
4）使用塑料材质的减压阀，应避免阳光直射
AR625-10-5,SMC先导式减压阀,smc总代理
| AR425-02B | AR435-03-56 | AR635-06BG | AR825-F12 |
| AR425-02BG | AR435-03-6 | AR635-06BG1 | AR825-F12BG |
| AR425-02BG1 | AR435-03BG1 | AR635-06G | AR825-F12G |
| AR425-02BG2 | AR435-03BG-R | AR635-06G1 | AR825-F12G-R |
| AR425-02G | AR435-03G | AR635-07-6 | AR825-F14 |
| AR425-02G1 | AR435-03G1 | AR635-08-6 | AR825-F14G |
| AR425-02G2 | AR435-03G2 | AR635-09-6 | AR825-F14G-R |
| AR425-03 | AR435-03G-2 | AR635-10 | AR825-N12BG |
| AR425-03BG | AR435-03-H | AR635-10-6 | AR825-N14G |
| AR425-03BG1 | AR435-04 | AR635-10BG | AR825-N14-X425 |
| AR425-03BG2 | AR435-04-56 | AR635-10G | AR835-12 |
| AR425-03G | AR435-04-6 | AR635-10G1 | AR835-12-5 |
| AR425-03G1 | AR435-04BG | AR635-10G-1 | AR835-12G |
| AR425-03G2 | AR435-04BG-R | AR635-10G2 | AR835-12-H |
| AR425-04 | AR435-04G | AR635-10G-6 | AR835-14 |
| AR425-04BG | AR435-04G1 | AR635-N10G | AR835-14-5 |
| AR425-04BG1 | AR435-04G-1 | AR825-12 | AR835-14G |
| AR425-04BG2 | AR435-04G2 | AR825-12-5 | AR835-14-H |
| AR425-04BG-R | AR435-04-H | AR825-12-6 | AR835-14-R |
| AR425-04G | AR435-04-L | AR825-12BG | AR835-F14 |
| AR425-04G1 | AR625-06 | AR825-12BG-R | AR925-20 |
| AR425-04G2 | AR625-06-5 | AR825-12G | AR925-20-56 |
| AR425-04-R | AR625-06BG | AR825-12G1 | AR925-20-6 |
| AR425-F02 | AR625-06BG1 | AR825-12G2 | AR925-20G |
| AR425-F02B | AR625-06BG2 | AR825-12G-R | AR925-20G1 |
| AR425-F03 | AR625-06BG-R | AR825-12-L | AR925-20G1-L |
| AR435-02 | AR625-06G | AR825-12-X425 | AR925-20G2 |
| AR435-02-56 | AR625-06G1 | AR825-14 | AR925-20G-H |
| AR435-02-6 | AR625-06G2 | AR825-14-5 | AR925-20G-L |
| AR435-02B | AR625-10 | AR825-14G | AR925-20G-X425 |
| AR435-02BG | AR625-10-5 | AR825-14G1 | AR925-20-X218 |
| AR435-02BG-1 | AR625-10BG | AR825-14G2 | AR925-F20 |
| AR435-02BG2 | AR625-10BG1 | AR825-14G-2 | AR925-F20G-R |
| AR435-02BG-2 | AR625-10BG2 | AR825-14G-3 | AR925-N20G |
| AR435-02BG-L | AR625-10G | AR825-14G-H | AR925-N20G-R |
| AR435-02G | AR625-10G1 | AR825-14G-R | AR935-20 |
| AR435-02G1 | AR625-10G2 | AR825-14-L | AR935-20G |
| AR435-02G2 | AR625-10G-R | AR825-14P | AR935-20G-R |
| AR435-02-H | AR625-F10 | AR825-14-X219 | AR935-20G-X230 |
| AR435-03 | AR635-06 | AR825-14-X425 | AR935-N20G |