德国Rexroth力士乐单向阀 单向阀又称止回阀或逆止阀。用于液压系统中防止油流反向流动,或者用于气动系统中防止压缩空气逆向流动。
单向阀Check Valve
单向阀又称止回阀或逆止阀。用于液压系统中防止油流反向流动,或者用于气动系统中防止压缩空气逆向流动。
单向阀有直通式和直角式两种。直通式单向阀用螺纹连接安装在管路上。直角式单向阀有螺纹连接、板式连接和法兰连接三种形式。液控单向阀也称闭锁阀或保压阀，它与单向阀相同，用以防止油液反向流动。但在液压回路中需要油流反向流动时又可利用控制油压，打开单向阀，使油流在两个方向都可流动。液控单向阀采用锥形阀芯，因此密封性能好。在要求封闭油路时，可用此阀作为油路的单向锁紧而起保压作用。液控单向阀控制油的泄漏方式有内泄式和外泄式二种。在油流反向出口无背压的油路中可用内泄式；否则需用外泄式，以降低控制油压力。
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方向控制按用途分为单向阀和换向阀。单向阀：只允许流体在管道中单向接通，反向即切断。换向阀：改变不同管路间的通、断关系。根据阀芯在阀体中的工作位置数分两位、三位等；根据所控制的通道数分两通、三通、四通、五通等；根据阀芯驱动方式分手动，机动，电动，液动等。图2为三位四通换向阀的工作原理。P 为供油口，O 为回油口，A 、B 是通向执行元件的输出口。当阀芯处於中位时，全部油口切断，执行元件不动；当阀芯移到右位时，P 与A 通，B 与O 通；当阀芯移到左位时，P 与B 通，A 与O 通。这样，执行元件就能作正、反向运动。
60年代后期，在上述几种液压控制阀的基础上又研制出电液比例控制阀。它的输出量（压力、流量）能随输入的电信号连续变化。电液比例控制阀按作用不同，相应地分为电液比例压力控制阀﹑电液比例流量控制阀和电液比例方向控制阀等。
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