原文：
直通式升降式止回阀应安装于水平管路上,立式升降式止回阀和底阀一般安装在垂直管路上,并且介质自下而上流动。 旋启式止回阀安装位置不妥限制，通常安装于水平管路，但也可以安装于垂直管路或倾料管路上。 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。直通式升降式止回阀应安装于水平管路上,立式升降式止回阀和底阀一般安装在垂直管路上,并且介质自下而上流动。 鸭嘴阀的优缺点 优点：鸭嘴阀成本低，如采用合适橡胶原料使用寿命超过金属止回阀，安装方便，安装方式灵活多样，可修补。 缺点：橡胶体不适用于野外长期漏天作业，采用高品质橡胶也无法避免老化现象。

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译文：
Straight-down-type check valves should be installed in horizontal pipes on the road, the end of vertical lift check valve and the valve is usually installed in the vertical pipe on the road, and the media bottom-up flow. Swing Check Valve inappropriate restrictions on the installation location, usually installed in horizontal piping, but can also be installed on vertical pipe or tilt of the pipeline. Install check valve should be special attention to the flow direction of media, media normal flow direction should be made with the body on the direction of the arrow indicated consistent, otherwise you will cut off the normal flow of media. Bottom valve should be installed in the pump suction pipe at the bottom. Check valve closes, will be produced in the pipeline water hammer pressure can cause serious valves, piping or equipment damage, especially for large population or high-pressure pipeline pipeline, it should cause those who use the high non-return valve Note. Straight-lift check valves should be installed in horizontal pipe on the road, vertical lift check valve and bottom valve is usually installed in the vertical pipe on the road, and the media bottom-up flow. Duckbill valve of the advantages and disadvantages Advantages: Duckbill valve, low cost, such as the use of appropriate service life of rubber over metal valve, easy installation, flexible installation can be repaired. Disadvantages: Rubber body does not apply to long-term leak-day field operations, high-quality rubber can not avoid aging.