译文：
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。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） 止回阀又称单向阀或逆止阀，其作用是防止管路中的介质倒流。水泵吸水关的底阀也属于止回阀类。 启闭件靠介质流动和力量自行开启或关闭，以防止介质倒流的阀门叫止回阀。止回阀属于自动阀类，主要用于介质单向流动的管道上，只允许介质向一个方向流动，以防止发生事故。 止回阀按结构划分，可分为升降式止回阀、旋启式止回阀和蝶式止回阀三种。升降式止回阀可分为立式和卧式两种。旋启式止回阀分为单瓣式、双瓣式和多瓣式三种。蝶式止回阀为直通式、以上几种止回阀在连接形式上可分为螺纹连接、法兰连接和焊接三种。 止回阀的安装应注意以下事顶： 1、在管线中不要使止回阀承受重量，大型的止回阀应独立支撑，使之不受管系产生的压力的影响。 2、安装时注意介质流动的方向应与阀体所票箭头方向一致。 3、升降式垂直瓣止回阀应安装在垂直管道上。 4、升降式水平瓣止回阀应安装在水平管道上。

“ Check valve and note the meaning of ”是由提供的国际阀门新闻，译文仅供参考。另外，中国止回阀网还提供相关产品搜索：、、、、等。

原文：
Check valve is to rely on their mobile media automatically open and close the valve flap, is used to prevent the media from the valve back, also known as check valve, check valve, reflux valve, and back pressure valve. Check Valve is an automatic valve, the main role is to prevent the media back, to prevent reverse pump and drive motor, and discharge the container medium. Check valve can also be used to the pressure which may rise to exceed the system supply pressure of the auxiliary system of pipeline. Check valve can be divided into swing check valve (according to the focus of rotation) and lift check valves (along the axis of movement) Called one-way valve or check valve, check valve, its role is to prevent the line of medium back. Pump water off the end of the valve check valve class also belong. Opening and closing pieces by medium flow and the forces to open or close the valve to prevent the media called back check valve. Check valves are automatic valves, mainly for one-way flow of media channels, only allowing media to flow in one direction, to prevent accidents. Check valve according to the structure are divided into lift check valve, swing check valve and butterfly valve of three. Lift check valve can be divided into two kinds of vertical and horizontal. Swing check valve into unicuspid type, double-valve type and multi-jaw type of three. Butterfly valve for the straight-through, more than some form of check valve in the connection can be divided into the threaded connection, flange connection and welding of three. Check valve should be aware of the following things to install the top: 1 Do not check valve in the pipeline to withstand the weight of a large check valve should be independent of support, so that the pressure piping system from the impact. 2, installation, pay attention to the direction of media flow valve by the votes should be consistent with the direction the arrow. 3, vertical valve lift check valve should be installed in the vertical pipe. 4, the level of valve lift check valve should be installed in horizontal pipelines.