Common Knowledge of Water Meters that Must be Known

The water meter is a fair device for measuring and paying for water resources. A water meter is also a must-have appliance for every household, and it is also the basis for energy saving and consumption reduction, and economic expenditure. However, the knowledge of water meters outsiders is only a kind of instrument, and the understanding of water meters is minimal. Let us learn the common sense of water meters together.
1. Why do I see bubbles on the surface of the water meter?
Answer: The water meter is divided into the wet type and dry type according to the form of the counter. The tap water can enter the counter is the wet type, and the counter is sealed in the dry type. The air released from the accumulated water on the surface of the wet water meter forms air bubbles. measure.
2. Can the water meter be installed obliquely?
Answer: The water meter should be installed according to the marked installation method (H-horizontal or V-vertical) and the direction of water flow. There are rotating measuring elements inside the mechanical water meter, and the center of gravity of all rotating elements rotates most smoothly on the rotating shaft, so measurement accuracy cannot be guaranteed when the water meter is installed obliquely.
3. Are there any requirements for the upstream and downstream pipelines of the water meter?
Answer: The upstream of the water meter is required to install a straight pipe section with the same diameter (D) as the water meter and the length is 10D, and the downstream of the water meter is required to install a straight pipe section with the same diameter (D) as the water meter and the length is 5D. In order to avoid excessive stress on the water meter, the axes of the upstream and downstream pipes and fittings of the water meter should be coincident.
4. Are there any regulations on the service life of the water meter?
Answer: For the nominal diameter less than or equal to 50mm, and the common flow rate does not exceed 16m/h, the water meter used for trade settlement is only subject to the first mandatory verification, limited use, and due rotation. The water meters replaced by rotation shall be scrapped.
The service life of water meters with a nominal diameter of 25mm and below generally does not exceed 6 years; the service life of water meters with a nominal diameter of greater than 25mm to 50mm generally does not exceed 4 years;
5. What affects the accuracy of a water meter?
Answer: There are currently three situations: one is that the meter body is rusted, or the pipeline is blocked by sediment and foreign matter; the other is that the components are aging, deformed, or damaged by hydraulic impact; the third is that the digital display is unclear, resulting in misreading and misreading.

Introduction to various flows of water meters
Starting flow QS: the flow that makes the minimum gear pointer of the water meter start to rotate;
Minimum flow Qmin: the minimum value of the rated flow range of the water meter.
Boundary flow Qt: The dividing point of the water meter accuracy value between the nominal flow Qn and the minimum flow Qmin.