订货号：R900599743

产品型号：SV30GB1-4X

品名：液控单向阀

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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。

(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。

上海韦米机电设备有限公司主营产品:
液压元件：柱塞泵、叶片泵、齿轮泵、马达、截止阀、方向阀、减压阀、流量控制阀、比例阀、伺服阀、插装阀、电液换向阀、电磁阀、电磁球阀、蓄能器、放大版、压力继电器、压力传感器。
气动元件:：气动阀、阀岛、阀组、电磁阀、换向阀、压力调节阀、流量控制阀,止回阀、气缸和驱动装置、压缩空气气源处理单元、真空技术、传感器、气动连接技术,电气连接技术。
电控伺服:：伺服驱动器,伺服电机、PLC模块、I/O模块、框架模块、电源模块、数据接口模块、键相位模块、继电器模块、测速模块、温度模块、显示屏、传感器、探头、前置器、延伸电缆。

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