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。

安装位置

单向阀就是止回阀 旋启式止回阀安装位置不受限制，通常安装于水平管路，但也可以安装于垂直管路或倾斜管路上。

注意事项

安装止回阀时，应特别注意介质流动方向，应使介质正常流动方向与阀体上指示的箭头方向相一致，否则就会截断介质的正常流动。底阀应安装在水泵吸水管路的底端。

止回阀关闭时，会在管路中产生水锤压力，严重时会导致阀门、管路或设备的损坏，尤其对于大口管路或高压管路，故应引起止回阀选用者的高度注意。止回阀只供防止各类管路或设备上流体介质逆流的单向启闭阀。

. Suitable for the following brands: Sweden Atlas Copco (Atlas? Science ko), American SULLAIR (SULLAIR), Ingersoll Rand (Ingersoll Rand), deng fu GD CompAir GardnerDenver (JiaDu Denver), Britain (CompAir) FS (fu sheng), Taiwan, Japan HITACHI (HITACHI), KOBELCO BOGE steel (god), Germany (bloomberg), KAESER (Kaiser), bully, xiangyang, liuzhou LiUTEHCH (fidelity), quincy, fox love, bolaite, schneider risheng, superior performance, seiko is force and can be complex, fly and insulted thestandard, tin, wind pressure, and d, ai can, waves, mountains, jaguar, guinness, poly, des, ShenHangJian, han chung, red rings, kettle... Air compressor, such as

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Check Valve Check Valve

Check valves or as a one-way check valve. Used to prevent the reverse flow of oil flow in hydraulic system, or used in pneumatic system prevent the reverse flow of compressed air.

Check valve have straight-through and right Angle type two kinds. Straight-through one-way valve with screw thread connection installed in the pipeline. Right Angle type check valve has a threaded