FD16FA2X/B03V12 FD16FA2X/B03V12
力士乐REXROTH液控单向阀应用
(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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