2024-06-27
What are the reasons for the idle or reverse operation of water meters
According to the editor's understanding, the idle characteristics of water meters can be basically divided into three types:
One is uneven rotation, sometimes fast and sometimes slow;
The second is the alternating occurrence of positive and negative directions;
The third is slow and uniform forward rotation, which is rare and mainly caused by air leakage at the valve packing.
Analysis of the location and cause of water meter idle operation:
1. The higher floors of each building are mostly found on the sixth and seventh floors;
2. Houses that have been uninhabited for a long time or unused water appliances and pipes with dead ends;
3. The indoor pipeline is long, with many bends, flipped up and down, and high points of gas accumulation;
4. The water pressure in front of the meter is unstable;
5. Generally, secondary water supply facilities are installed when multiple users are idle on a large area;
6. The water supply pipelines are mostly mixed with PPR pipes and galvanized pipes.
The reason for idling can be attributed to:
Due to gas accumulation at one or more locations behind the water meter, the volume of gas accumulated in the pipeline changes continuously with the continuous change of water pressure, resulting in continuous, uneven, and irregular rotation of the water meter.
Solutions and precautions
The fundamental solution is to release the accumulated gas inside the pipeline. But specific cases need to be analyzed in detail, and the solution steps are generally as follows:
1. Observe the rotation of the watch needle to see if it is rotating at a constant speed. If it rotates at a constant speed, it is mostly due to internal leakage behind the meter or air leakage at the packing of individual valves. After elimination, it can be solved.
2. If the rotation is uneven and the water meter still runs idle after eliminating internal leakage, all water points should be deflated. Especially, pay attention to checking the plugs of the pipeline that have not been used for a long time, and see if there is a heater directly connected to the pipeline (such as soil heater, water heater, solar energy, etc.).
3. After excluding the above items, if the problem is still unresolved, it is necessary to observe whether there is flipping up and down during pipeline laying, excessive bends, local π - shaped laying, and whether the water nozzle pressure is low, high, and unstable. Firstly, solve the water pressure problem; Secondly, correct unreasonable pipeline laying methods; Then release the air, and the problem of idling will generally be solved.
Key points to note:
1. Air storage in washing machines and water heaters causes the water meter to run empty;
2. Gas storage in the backup pipeline causes the water meter to run idle;
3. Improper use of secondary water supply facilities resulted in a large area of water meter idling.
Specific phenomena and causes of occurrence:
Phenomenon 1: Only forward rotation, and the pointer rotates faster and more evenly;
Reason: It is usually caused by damage to the pipes and water facilities behind the water meter, and improper closure, resulting in water leakage. Generally, the leakage point is easier to determine.
Phenomenon 2: The pointer rotates slowly forward, or the pointer first rotates forward and then reverses, but the degree of forward rotation is greater than the degree of inversion;
Reason: Generally, it is caused by incomplete installation of pipes and fittings or sand holes on them, which can cause water seepage when the water pressure in the pipeline fluctuates. In this case, it is difficult to find the leakage point.
Phenomenon 3: In general, the pointer does not rotate, but when nearby users (the same main pipe) use water, it rotates;
Reason: Generally, due to the small diameter of the main pipe or the proximity of adjacent water meters, there is not enough space left for straight pipe sections before and after the water meters; Or there is a blind pipe behind the meter that cannot be vented. When other users use water, the water flow rate is high, causing fluctuations in water pressure or air pressure inside the pipe, which drives the impeller of the water meter to rotate and generally causes no water leakage points.
Phenomenon 4: The interval time varies, and the pointer first rotates forward and then reverses, but the degree of rotation is similar;
Reason: It is basically due to the presence of air in the pipeline behind the water meter, which causes the impeller of the water meter to rotate back and forth when the water pressure fluctuates. This phenomenon is common and belongs to a normal phenomenon.
