译文：
减压阀（ORreducingvalve）是采用控制阀体内的启闭件的开度来调节介质的流量，将介质的压力降低，同时借助阀后压力的作用调节启闭件的开度，使阀后压力保持在一定范围内，在进口压力不断变化的情况下，保持出口压力在设定的范围内，保护其后的生活生产器具。 使用减压阀时，应该注意： 1、使用减压阀时，严禁乱拧乱动、自行拆卸。否则减压阀的严密性能和降压性能都会遭到破坏。这不但影响正常供气，而且会造成以高压气体直接送气或漏气发生火灾的危险。 2、减压阀不但起降压作用而且起稳压作用。因此，使用时，禁止将减压阀的"出气孔"堵住。 OR减压阀，是常用的减压阀，安装和维护应注意以下事项： 1.为了操作和维护方便，该阀一般直立安装在水平管道上。 2.OR减压阀安装必须严格按照阀体上的箭头方向保持和流体流动方向一致。如果水质不清洁含有一些杂质，必须在OR减压阀的上游进水口安装意大利OR过滤器（我们建议过滤精度不低于0.5mm）。 3.为了防止阀后压力超压，应在离阀出口不少于4M处安装一个OR减压阀。 4.意大利OR减压阀在管道中起到一定的止回作用，为了防止水锤的危害，也可安装小的膨胀水箱，防止损坏管道和阀门，过滤器必须安装在减压阀的进水管前，而膨胀水箱必须安装在减压阀出水管后！ 5.如果需要将OR减压阀安装在热水系统时，您必须在减压阀和膨胀水箱之间安装意大利OR止回阀。这样既可以让膨胀水箱吸收由于热膨胀而增加的水的体积，又可以防止热水回流或压力波动对减压阀的影响，确保减压阀长期正常工作。

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原文：
Pressure Reducing Valve (ORreducingvalve) is used for opening and closing control valve body to adjust the opening parts of the flow medium, the medium pressure has eased, while the role of pressure through the valve opening and closing parts of the opening adjustment to maintain a back pressure valve within a certain range, the inlet pressure to changing circumstances, to maintain outlet pressure in the range, the protection of life was the production apparatus. When using the valve, it should be noted: 1, using the valve, the non-random screw tamper with, disassemble. Otherwise, to close valve performance and step-down properties are being destroyed. This will not only affect the normal supply, but also contributing to the high pressure gas leak direct aspiration or the risk of fire. 2, valve not only play the role of antihypertensive effect and from the regulator. Therefore, the use, prohibition of pressure reducing valve of the "vent" blocked. OR valve, the valve is used, installation and maintenance should note the following: 1. In order to facilitate the operation and maintenance of the valve installed in the level normally vertical pipe. 2.OR valve must be installed in strict accordance with the direction of the arrow on the valve and fluid flow to keep the same direction. If dirty water contains some impurities, OR valve must be installed upstream of the Italian OR inlet filter (we recommend filtering accuracy of not less than 0.5mm). 3. In order to prevent overpressure valve after the pressure should be at least 4M away from the exit valve to install an OR valve. 4. Italian OR valve in the pipeline back to play a role only, in order to prevent water hammer damage and a small expansion tank can be installed to prevent damage to pipes and valves, filters must be installed on the progress in reducing valve water before, and expansion tank must be installed after the valve outlet pipe! 5. If you need to OR valve installed in the hot water system, you need to install a pressure reducing valve and expansion tank valve OR Italy. This can enable the expansion tank absorption due to thermal expansion and the increase in the volume of water, but also to prevent the hot water return valve or pressure fluctuations on the impact of long-term work to ensure the valve.