Causes Of Water Meter Rotation
1. Pressure fluctuations
Because water is a liquid, the physical characteristics exhibited in general are incompressible, but in a water pipe, the pressure of the pipe is high, and the water will show a certain degree of compressibility. In tap water pipelines, pressure fluctuations are inevitable. At present, the water meters we use are mechanical meters. The kinetic energy generated by the water flowing in them drives the gears to run, so as to achieve the purpose of measuring the amount of water. When not using water, a fixed amount of high-pressure water is stored in the pipes connected to the two ends of the water meter; therefore, when the pressure of the municipal pipe network increases, the volume of tap water in the pipe behind the meter will decrease due to the increase in pressure, and at this time it will There is a trace of water passing through the water meter, which produces a forward rotation; when the pressure decreases, the compressed water in the tube behind the meter expands due to the decrease in pressure, and there will also be a trace of water passing through the water meter, except that it is reversed at this time. As we all know, when a mechanical watch enters the water, it moves in and out to push the gears forward, and when it enters the water upside down, it pushes the gears up and down, pushing the gears in reverse. The amount of water entering the head is the same, but the readings reflected on the water meter are very different. According to statistics, when there is no air in the pipeline, the amount of water generated is very small, about 0.5-1m3 / month. Under normal circumstances, this amount of water users will not notice; at the same time this is also a normal result at the current level of metering.
2.Airbag
This cause a large amount of rotation water. The production process of the water company is built in the open air. A large amount of gas will be dissolved in the water during the production process. At the same time, the pipeline will also carry gas during the construction process. If the exhaust valve on the pipeline is not properly set, the gas will be lost. Can't be ruled out well. In this way, if there is no water in the home for a long time or the design of the pipes is unreasonable, there will be airbags in the pipe ** points or protruding points in the home. As we all know, the compressibility of the gas is very high. At this time, if there is pressure fluctuation on the pipe network, the space expansion and contraction in the pipeline behind the meter will be very large, so the amount of water meter rotation will be large. According to statistics, the amount of water generated is as low as 2-3 m3 / month, and more than tens of cubic meters of water are generated each month. Therefore, at present, the rotation of most water meters at home is caused by the presence of airbags in the tube behind the meter.
3. Installation method and installation quality
1) Due to the fact that the water meters are mostly delivered in one unit, the household meters are concentrated in a box and installed on the first floor. Considering the protection against cold and frost in winter and the convenience of meter reading, use a Φ40mm-Φ50mm pipe to connect 6 or 12 water meters, the distance between the meter and the meter is small, and there are fewer straight pipe sections left by the water meter, which will affect the normality of the water meter. Metering, causing the water meter to rotate.
2) Installation quality, pipeline works are basically buried in the ground or wall, which is a hidden project. The national pipeline construction code stipulates the installation requirements, construction procedures, acceptance standards, and precautions for various pipe constructions. However, during the construction of the site, some managers did not perform the construction in accordance with the specifications, resulting in more or less quality of the pipeline. problem.