At present, there are more and more anti-drip water meters (also called drip metering meters and highly sensitive water meters) on the market, but their quality and reputation are not very good. The main reason is that most of these drip-proof water meters have a fatality. The problem is that the service life is not long, and the anti-drip effect can be achieved when it is just used, but after three to five months, the anti-drip water meter will not prevent leakage. The main reasons for these problems are: At present, in the design of anti-dripping water meters, different methods are used to seal the main path of the water meter, but the design of the sediment and water impurities is not done well. Therefore, as long as the plugging (some use of gravity plate, and some use the piston) to retain impurities and produce scale, the meter will lose the anti-drip function.

In addition, due to the fact that the residents of our country’s residents are mostly apartment-style, the distance between households and households is very short (usually only three to four meters), and most households now use faucets that open and close quickly, so it is easy for neighbors to use water. Water hammer phenomenon occurs. This kind of water hammer will cause the water pressure in the pipe network to be unstable. This kind of water pressure instability will affect the operation of the water meter and cause creep (also called idling and rotation, that is, when the water tap is closed, due to water pressure in the pipe network. Instability causes the water meter to move forward. The degree of influence is related to the structure and sensitivity of the water meter. The higher the water meter's sensitivity, the greater the influence of this water pressure instability on it (according to the author's extensive experiments, the initial flow rate is Below 2L/H jet-type drip-proof water meter and D-stage piston volumetric water meter, the amount of daily impingement can reach about 190 liters, that is, 5 cubic meters to 10 cubic meters of tap water per month can be idle. The current B-grade speed meter has been increased by more than 20 times), so I conclude that in China, the higher the sensitivity of the water meter, the better.

In summary, we should pay attention to the following issues when designing and selecting a drip-proof water meter:
1. Relatively low initial flow (usually less than 1L/H)
2. It should be able to prevent impurities and scales in tap water from blocking or jamming the drip-proof mechanism, as well as automatically draining sediment and contaminants from the bottom net through the water meter out of the tap. Its creep (idle) performance should be lower than current Class B water meters or equivalent 4. Dripping state when the measurement error can not be too large (preferably can be controlled within ± 50%)