SV10PA1-42力士乐液控单向阀；液控单向阀是方向控制阀中的一种。具体分类：
方向控制阀按其在液压系统中的功能分为单向阀和换向阀两大类。
单向阀在液压传动中有普通单向阀和液控单向阀。
(1)保持压力。
滑阀式换向阀都有间隙泄漏现象，只能短时间保压。当有保压要求时，可在油路上加一个液控单向阀，利用锥阀关闭的严密性，使油路长时间保压。
(2)液压缸的“支承”。
在立式液压缸中，由于滑阀和管的泄漏，在活塞和活塞杆的重力下，可能引起活塞和活塞杆下滑。将液控单向阀接于液压缸下腔的油路，则可防止液压缸活塞和滑块等活动部分下滑。
(3)实现液压缸锁紧。
当换向阀处于中位时，两个液控单向阀关闭，可严密封闭液压缸两腔的油液，这时活塞就不能因外力作用而产生移动。
(4)大流量排油。
液压缸两腔的有效工作面积相差很大。在活塞退回时，液压缸右腔排油量骤然增大，此时若采用小流量的滑阀，会产生节流作用，限制活塞的后退速度；若加设液控单向阀，在液压缸活塞后退时，控制压力油将液控单向阀打开，便可以顺利地将右腔油液排出。
(5)作充油阀。
立式液压缸的活塞在高速下降过程中，因高压油和自重的作用，致使下降迅速，产生吸空和负压，必须增设补油装置。液控单向阀作为充油阀使用，以完成补油功能。
(6)组合成换向阀。
在设计液压回路时，有时可将液控单向阀组合成换向阀使用。例如：用两个液控单向阀和一个单向阀并联（单向阀居中），则相当于一个三位三通换向阀的换向回路。需要指出，控制压力油油口不工作时，应使其通回油箱，否则控制活塞难以复位，单向阀反向不能截止液流。

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压力控制按用途分为溢流阀﹑减压阀和顺序阀。⑴溢流阀：能控制液压系统在达到调定压力时保持恒定状态。用於过载保护的溢流阀称为安全阀。当系统发生故障，压力升高到可能造成破坏的限定值时，阀口会打开而溢流，以保证系统的安全。⑵减压阀：能控制分支回路得到比主回路油压低的稳定压力。减压阀按它所控制的压力功能不同，又可分为定值减压阀（输出压力为恒定值）﹑定差减压阀（输入与输出压力差为定值）和定比减压阀（输入与输出压力间保持一定的比例）。⑶顺序阀：能使一个执行元件（如液压缸﹑液压马达等）动作以后，再按顺序使其他执行元件动作。油泵产生的压力先推动液压缸1运动，同时通过顺序阀的进油口作用在面积A 上，当液压缸1运动完全成后，压力升高，作用在面积A 的向上推力大於弹簧的调定值后，阀芯上升使进油口与出油口相通，使液压缸2运动。

SV10PA1-42力士乐液控单向阀

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SV10PA1-42力士乐液控单向阀

液控单向阀是依靠控制流体压力，可以使单向阀反向流通的阀。这种阀在煤矿机械的液压支护设备中占有较重要的地位。液控单向阀与普通单向阀不同之处是多了一个控制油路K，当控制油路未接通压力油液时，液控单向阀就象普通单向阀一样工作，压力油只从进油口流向出油口，不能反向流动。当控制油路油控制压力输入时，活塞顶杆在压力油作用下向右移动，用顶杆顶开单向阀，使进出油口接通。若出油口大于进油口就能使油液反向流动。

SV10PA1-42力士乐液控单向阀

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力士乐REXROTH液控单向阀SL 6
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力士乐REXROTH液控单向阀SL 10...32
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力士乐REXROTH方向阀
力士乐REXROTH二位四通和三位四通方向阀Z4WE 6
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SV10PA1-42力士乐液控单向阀