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节流阀的特点
1、构造较简单，便于制造和维修，成本低。
2、调节精度不高，不能作调节使用。
3、密封面易冲蚀，不能作切断介质用。
4、密封性较差。
单向阀特点
1、单向阀是流体只能沿进口流动，出口介质却无法回流的装置。
2、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。
3、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。
4、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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