原文：
止回阀选用和安装要点： 一、止回阀选用方法： 1）、止回阀(aetv One-way valve)：一般适用于清净介质，不宜用于含有固体颗粒和粘度较大的介质。 2）、对于DN50mm以下的低压止回阀(aetv One-way valve)：，宜选用蝶式止回阀、立式升降止回阀和隔膜式止回阀；对于DN大于200mm、小于1200mm的中低压止回阀，宜选用无磨损球形上回阀；对于v DN大于50mm、小于2000mm的低压止回阀，宜选用蝶式止回阀和隔膜式止回阀。 3）、隔膜式止回阀适用于易产生水击的管路上，隔膜可以很好地xx介质逆流时产生的水击，但受温度和压力限制，一般使用在低压常温管道上。 4）、对于要求关闭时水击冲击比较小或无水击的管路，宜选用缓闭旋启式止回阀和缓闭蝶式止回阀。 二、止回阀的施工、安装要点： 1）、安装位置、高度、进出口方向必须符合设计要求，注意介质流动的方向应与阀体所标箭头方向一致，连接应牢固紧密。 2）、阀门安装前必须进行外观检查，阀门的铭牌应符合现行国家标准《通用阀门标志》GB 12220的规定。对于工作压力大于1.0 MPa 及在主干管上起到切断作用的阀门，安装前应进行强度和严密性能试验，合格后方准使用。强度试验时，试验压力为公称压力的1.5倍，持续时间不少于5min， 阀门壳体、填料应无渗漏为合格。严密性试验时，试验压力为公称压力的1.1倍；试验持续的时间符合GB 50243的要求。 3）、在管线中不要使止回阀承受重量，大型的止回阀(aetv One-way valve)：应独立支撑，使之不受管系产生的压力的影响。

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译文：
Valve selection and installation of main points: 1, valve selection methods: 1), valve (aetv One-way valve): generally applicable to pure media, not suitable for containing the solid particles and the viscosity of the medium. 2), below the low pressure valve for DN50mm (aetv One-way valve):, better to use the butterfly valve, check valve and diaphragm vertical lift check valve; for DN larger than 200mm, less than 1200mm of the low pressure check valve should be chosen not wear ball valve on the back; for DN larger than 50mm, less than 2000mm in the low pressure check valve, butterfly valve and the diaphragm should use check valves. 3), diaphragm-type check valve suitable for easy to produce water hammer in the pipeline, divide may well eliminate the media generated when the water hit counter, but by the temperature and pressure constraints, generally used at room temperature in the low-pressure pipe. 4), the required closed relatively small impact of water hammer hit the pipe or water, should use slow gentle swing check valve closed closed butterfly valve. Second, check the construction, installation points: 1), the installation location, height, must meet the design requirements of the import and export orientation, attention to the direction of media flow valve should be the same as the arrow direction, the connection should firmly close. 2), the valve must be installed prior to visual inspection, the valve plate should be consistent with existing national standards, "Universal Valve logo" GB 12220 requirement. The working pressure greater than 1.0 MPa and in the main pipe on the role played off valve, the installation should be carried out before the performance test the strength and tight, qualified prospective use of the rear. Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5min, the valve housing, packing should be no leakage in compliance. Tightness test, the test pressure for the nominal pressure of 1.1 times; test duration consistent with the requirements of GB 50243. 3) Do not check valve in the pipeline to withstand the weight of a large valve (aetv One-way valve): should be independent of support, so that non-regulated system generated pressure.