SV20PA1-4X液控单向阀 德国力士乐REXROTH液压控制阀 

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SV20PA1-4X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。当控制油路有控制压力输入时，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。

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。

单向阀主要特点

(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加大，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。

注意事项。

(1)必须保证液控单向阀有足够的控制压力，较好不允许控制压力失压。应注意控制压力是否满足反向开启的要求。如果液控单向阀的控制引自主系统时，则要分析主系统压力的变化对控制油路压力的影响，以免出现液控单向阀的误动作。

(2)根据液控单向阀在液压系统中的位置或反向出油腔后的液流阻力（背压）大小，合理选择液控单向阀的结构（简式或复式）及泄油方式（内泄或外泄）。对于内泄式液控单向阀来说，当反向油出口压力超过一定值时，液控部分将失去控制作用，故内泄式液控单向阀一般用于反向出油腔无背压或背压较小的场合；而外泄式液控单向阀可用于反向出油腔背压较高的场合，以降低较小的控制压力，节省控制功率。系统若采用内卸式，则柱塞缸将断续下降发出振动和噪声。

SV20PA1-4X液控单向阀型号

力士乐REXROTH液控单向阀SV 6

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