译文：
底阀用途 底阀是一种节约能源的阀,一般安装在水泵水下吸管的底端.限制水泵管内液体返回水源,起着只进不出的功能.阀盖上有很多个进水品和加强筋,起到了不易堵塞,主要应用在抽水的管路上.水道和支承的作用.口径有单瓣,双瓣,多瓣型.有法兰连接和螺纹连接. 底阀由阀估,阀瓣,阀盖,衬套,密封圈等零件组成,详见下图水源的水从阀盖进入阀体.在流体的压力作用下,阀瓣打开水,当示停后出口管内的压力将阀瓣迅速关闭,液体将不会倒回水源,起到了即畅通抽水又节约水能损失的作用. 1、为了防止介质逆流，在设备、装置和管道上都应安装止回阀； 2、止回阀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； 3、一般在公称通经50mm的水平管道上都应选用立式升降止回阀； 升降式性能规范 公称压力：PN0.25MPa 公称通径：DN15～DN350 适用介质：水、油、及非腐蚀性介质 执行标准：Q/12 NJ3583-2001 试验标准：GB/T13927-1992

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原文：
Use the bottom valve Bottom valve is a valve of energy conservation, water suction pump is usually installed in the bottom. Restrict fluid return pump pipe water into play not only the function. Valve cover have a number of water supplies and strengthen the tendons, played a hard block, mainly used in water pumping in the pipeline. watercourses and supporting role. caliber are ill with double valve, multi-jaw type. a flange connection and thread connection. Estimated from the valve bottom valve, flap valve, valve cover, bushes, seals and other components as described in the following diagram sources of water from the valve cover into the body. In the fluid pressure, the valve flap to open water, when the show stopped Export tube after the pressure will quickly close the flap valve, liquid water will not fall back, played the smooth flow of pumped water loss but also save the role. 1, in order to prevent the media counter-current in the equipment, installation and pipe valve should be installed; 2, check valve generally applicable to pure media, not for containing the solid particles and the viscosity of the medium; 3, generally in the nominal level by 50mm pipe should be used on vertical lift check valve; Lift Performance Specifications Nominal pressure: PN0.25MPa Nominal diameter: DN15 ~ DN350 Suitable medium: water, oil, and non-corrosive media Implementation of the standards: Q/12 NJ3583-2001 Test Standard: GB/T13927-1992