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20V4A
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20V5A
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20V6A
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20V7A
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20V8A 
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20V9A
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20V10A 
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20V11A
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20V12A 
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20V14A
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25V10A
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25V12A 
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25V14A
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25V15A
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25V17A
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25V19A
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25V21A 
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35V21A
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35V25A
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35V30A
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35V32A 
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35V35A
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35V38A
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45V42A
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45V45A
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45V50A 
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45V57A 
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45V60A
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45V66A 
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45V76A 
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2520V双联    
3525V双联
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4535V双联
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 ②多级调压回路当液压执行元件 在工作循环中的各个阶段需要几种不同工作压力时，可采用图830所示的多级调压回路。图中，三位四通电磁阀3与先导式溢流阀的控制油口相接，当电磁阀铁1DT与2DT不通电时，系统压力由主溢流阀2调节(如20MPa);当1DT通电时，系统压力由直动势(式)溢流阀4调节(如15MPa);当2DT通电时，系统压力由直动式溢流阀5调节(如10MPa)。

      ③限压回路  在立式机床上，可采用图8-31所示的限压回路。当液压缸5 下行(IDT通电)时，先导式溢流阀2限制着缸5下压时的较大工作压力(高压):液压缸5上行时，只需克服塞杆等的重力上抬溢流阀4限制着上升时回路的压力(低压), 此时系统压力大小由阀4限定，阀2调的压力比阀4的高。


④比例溢流阀调压回路图8-32为采用主溢流阀(先导式溢流)和比例先导调压阀组成的调压回路。当给阀1的比例电磁铁输入连续(也可不连续)的电信号,就可使溢流阀进行连续(或不连续)地调整输往系统的压力。先导式调压阀1与阀2的控制油口相接。
(2)故障分析与排除  新联氧站的能回邮空衣丑8[故障1]级 (多级)调压回路中的压力冲击
在图8-33(a)所示的二级调压回路中，1DT不通电时，系统压力由溢流阀2调节为P1;当1DT通电时，系统压力由先导调压阀4调节为P2。当P与P2相差较大，压力由P1切换到压力P2时，由于阀4与阀3间的油路内在切换前没有压力，阀3切换( 1DT通电)时，溢流阀2遥控口处的瞬时压力由P1下降到几乎为零后再回升到P2,系统便产生较大的冲击。
解决办法是将阀3与阀4交换-一个位置[图8-33(b)]，这样从阀2的遥控口到阀4的油路里总是充满了压力油，便不会产生过大的压力冲击。