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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。旋启式止回阀在完全打开的状况下，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。

力士乐管式单向阀S6A1.0

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机,机械式切断机主要利用凸轮的运动来切断钢筋,液压式切断机主要利用液压系统为机器提供动力进行工作。 这两种切断机相比较而言,液压式切断机优势较为明显,性能稳定 、噪音小,这些优势给液压切断机的广泛应用创造力有利条件。 就目前的发展趋势来看,液压切断机克服了过去的一些缺点,剪姆率、速度、误差等性能有了大幅提高。本设计对切断机的液压系统泵站进行了设计,系统采用电磁换向阀、叠加式减压阀 压力传感器等措施,使该液压系统运行平稳、能耗小、安全可靠性高。

由于液压技术有很多优点，从一般传动到精密控制，都得到了广泛的应用。在机械工业中，目前机床传动系统有85%采用液压传动与控制，如磨、铣、刨、拉、及组合车床等；在工程机械中，普遍采用了液压传动，如挖掘机、轮胎装载机、汽车起动机、履带推土机，自行式铲运机、平地机、压路机等；在农业机械中，目前已用于联合收割机、拖拉机、工具悬挂系统；在汽车工业中，液压制动、液压自卸、消防云梯等都得到广泛应用；在冶金工业中，如电炉控制系统、轧钢机的控制系统、手炉装料、转炉控制，高炉控制等；在轻纺工业中，诸如注塑机、橡胶硫化机、造纸机、印刷机、纺织机械等；在船舶工业中，如全液压挖泥船、打捞船、采油平台、翼船、气垫船及船舶辅机等。一切工程领域，凡是有机械设备的场合，均可采用液压技术，使用领域和设备越来越宽、越来越多

液压传动是一种可达到传递动力、增加动力、改变速比等目的的传动方式。液压传动是以液体为工作介质，靠处于密闭容器内的液体静压力来传递力的传动方式，静压力的大小取决于负载，而负载速度的传递是按液体容积变化相等的原则进行的，其速度大小取决于流量；如果忽略损失，液压传动所传递的力与速度无关。
液压传动相比其他传统传动方式优势较为明显：1）功率重量比大，能以较轻的设备重量取得更大的力和转矩；2）惯性小，启动、制动迅速；3）无级调速，调速范围大，低速性能好；4）高响应速度；5）高负载刚度；6）可控性好，易于实现自动化，液压元件位臵可以根据设备需要进行调整。