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一、普通单向阀

作用:使油液只能沿一个方向流动,不许反向倒流。

结构:由阀体1、阀芯2、弹簧3等零件组成。

工作原理:

P1流入，阀芯左移,通流。—一 压力损失小

P2流入,阀芯压紧在阀座上,关闭。一一密封性好

与其他阀组成复合阀,如单向节流阀、单向顺序阀、单向减压阀等。

安装在泵的出口,一方面防止压力冲击影响泵的正常工作，另一方面防止泵不工作时油液经泵回油箱。

安装在回油路上作背压阀用。需要换成刚度较大的弹簧

二、液控单向阀

结构:由控制活塞1、顶杆2、阀芯3和弹簧等组成。

作用:液控单向阀可使油液在两个方向自由通流。

工作原理:

控制口无液压油进入, A单向通B ,普通单向阀。

控制口无液压油进入, A、B互通,通路。

液压锁

左、右位:液压缸左右运动。

中位:锁紧液压缸,使其停在任意位置。

保压。

左位:缸向上退回;

右位:补油;

中位:泵卸荷,液压缸上腔压力由液控单向阀保压。

一、单向阀

类型:普通单向阀、液控单向阀

1、普通单向阀

作用:只允许油液沿一个方向流动，不允许油液反向倒流(起止回作用)

对单向阀的性能要求:

(1) 正向导通时，压力损失要小;

(2)反向截止时，密封性要好。

2、

液控单向阀

作用:

(1)起止回作用;

(2)必要时解除逆止，允许油液反向通过。

3、单向阀用途

(1)止回作用:安装在泵的出口，p 0.3~0.5 bar

(2)作背压阀用:防止液压缸前冲或爬行，使系统作平稳。

(3)作锁紧装置用:起重机支腿、夹紧回路等。

(4)保持控制油路有必要的压力: Pr≥P液挖

(5)作复合阀使用:单向节流阀、单向顺序阀、单向减压阀、单向调速阀等。

(6)局部回路作安全阀使用: Ppr>P换热器正常工作的距力

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。

止回阀是指依靠介质本身流动而自动开、闭阀瓣，用来防止介质倒流的阀门，又称逆止阀、单向阀、逆流阀、和背压阀。止回阀属于一种自动阀门，其主要作用是防止介质倒流、防止泵及驱动电动机反转，以及容器介质的泄放。

工作原理

止回阀还可用于给其中的压力可能升至超过系统压的辅助系统提供补给的管路上。止回阀主要可分为旋启式止回阀（依重心旋转）与升降式止回阀（沿轴线移动）。

止回阀这种类型的阀门的作用是只允许介质向一个方向流动，而且阻止反方向流动。通常这种阀门是自动工作的，在一个方向流动的流体压力作用下，阀瓣打开；流体反方向流动时，由流体压力和阀瓣的自重合阀瓣作用于阀座，从而切断流动。

其中止回阀就属于这种类型的阀门，它包括旋启式止回阀和升降式止回阀。旋启式止回阀有一介铰链机构，还有一个像门一样的阀瓣自由地靠在倾斜的阀座表面上。为了确保阀瓣每次都能到达阀座面的合适位置，阀瓣设计在铰链机构，以便阀瓣具有足够有旋启空间，并使阀瓣真正的、全面的与阀座接触。阀瓣可以全部用金属制成，也可以在金属上镶嵌皮革、橡胶、或者采用合成覆盖面，这取决于使用性能的要求。旋启式止回阀在打开的状况下，流体压力几乎不受阻碍，因此通过阀门的压力降相对较小。升降式止回阀的阀瓣坐落位于阀体上阀座密封面上。此阀门除了阀瓣可以自由地升降之外，其余部分如同截止阀一样，流体压力使阀瓣从阀座密封面上抬起，介质回流导致阀瓣回落到阀座上，并切断流动。根据使用条件，阀瓣可以是全金属结构，也可以是在阀瓣架上镶嵌橡胶垫或橡胶环的形式。像截止阀一样，流体通过升降式止回阀的通道也是狭窄的，因此通过升降式止回阀的压力降比旋启式止回阀大些，而且旋启式止回阀的流量受到的限制很少。

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液压站是由液压泵、驱动用电动机、油箱、方向阀、节流阀、溢流阀等构成的液压源装置或包括控制阀在内的液压装置。按驱动装置要求的流向、压力和流量供油，适用于驱动装置与液压站分离的各种机械上，将液压站与驱动装置（油缸或马达）用油管相连，液压系统即可实现各种规定的动作。

液压站作用液压站一般是为大中型工业生产的机械运行提供润滑、动力的机电装置。

使用液压系统是由于液压系统在动力传递中具有用途广、效率高和构造简单的特点。液压系统的主要任务就是将动力从一种形式转变成另一种形式。

液压站又称液压泵站，电机带动油泵旋转，泵从油箱中吸油后打油，将机械能转化为液压油的压力能，液压油通过集成块（或阀组合）被液压阀实现了方向、压力、流量调节后经外接管路传输到液压机械的油缸或油马达中，从而控制了液动机方向的变换、力量的大小及速度的快慢，推动各种液压机械做功。

液压站是独立的液压装置，它按驱动装置（主机）要求供油，并控制油流的方向、压力和流量，它适用于主机与液压装置可分离的各种液压机械下，由电机带动油泵旋转，泵从油箱中吸油后打油，将机械能转化为液压油的压力能。

用户购买后只要将液压站与主机上的执行机构（油缸和油马达）用油管相连，液压机械即可实现各种规定的动作、工作循环。

液压机，以高压液体（油、乳化液等）传送工作压力的锻压机械。液压机的行程是可变的，能够在任意位置发出大的工作力。液压机工作平稳，没有震动，容易达到较大的锻造深度，适合于大锻件的锻造和大规格板料的拉深、打包和压块等工作。液压机主要包括水压机和油压机。某些弯曲、矫正、剪切机械也属于液压机一类。

液压机工作原理

利用帕斯卡定律制成的利用液体压强传动的机械，种类很多。当然，用途也根据需要是多种多样的。如按传递压强的液体种类来分，有油压机和水压机两大类。水压机产生的总压力较大，常用于锻造和冲压。锻造水压机又分为模锻水压机和自由锻水压机两种。模锻水压机要用模具，而自由锻水压机不用模具。