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2. Reasons and solutions for water meter rotation
Three reasons for water meter rotation
1. Pressure fluctuations. As water is a liquid, its physical properties are generally incompressible. However, in tap water pipelines, when the pipeline pressure is high, water exhibits a certain degree of compressibility. In the water pipeline, pressure fluctuations are inevitable, and currently the water meters we use are mechanical meters that rely on the kinetic energy generated by the flow of water to drive the gears to operate, thereby achieving the purpose of measuring water volume. When water is not used, there is a fixed amount of high-pressure water in the pipes connected at both ends of the water meter; Therefore, when the pressure in the municipal pipeline network increases, the volume of tap water in the pipe behind the meter will shrink due to the increase in pressure, and a small amount of water will pass through the meter, producing a positive rotation; When the pressure decreases, the compressed water in the back tube of the meter expands due to the decrease in pressure, and a small amount of water will also pass through the meter, but the difference is that it is reversed at this time. We all know that in general, mechanical meters have a downward inlet and an upward outlet when water enters, which drives the gear to rotate forward. However, when water enters in the opposite direction, it has an upward inlet and a downward outlet, which drives the gear to rotate in the opposite direction. The resistance experienced by the two inlet phases is different. Although the inlet volume of the two ends is the same, the readings reflected on the water met
2、 gasbag. The amount of rotational water generated by this reason is relatively large. The production process of water supply enterprises is all open-air construction. During the production process, a large amount of gas will dissolve in the water. At the same time, gas will also be introduced into the pipeline during the construction process. If the exhaust valve on the pipeline is not set properly, the gas cannot be discharged well. If the house does not use water for a long time or the pipeline design is unreasonable, air pockets will be generated at the highest or protruding point of the pipeline in the house. As is well known, gases have high compressibility. If there are pressure fluctuations on the pipeline, the space inside the pipeline behind the meter will expand and contract greatly, resulting in a significant amount of water meter rotation.
3、 Installation method and quality: 1) Due to the fact that most water meters are installed in a single unit on the first floor, they are all concentrated in one box. Considering winter cold and frost prevention, as well as convenient meter reading, a pipe with a diameter of 40mm -50mm is used to connect 6 or 12 water meters. The distance between the meters is small, and there are few straight pipe sections left for the water meters, which will also affect the normal measurement of the water meters and cause them to rotate. 2) Installation quality: Most of the pipeline workers, Xiao Zhaoxiong and Cheng, are buried underground or in walls, which is a concealed project. The national pipeline construction specifications stipulate the installation requirements, construction procedures, acceptance standards, and precautions for vari