May I know what are the features of water meters?

There are three types of water saving water meters in the market***.

1, the first type of anti-drip water meter is made of magnetic materials composed of magnetic pressure-sensitive elements for the anti-drip mechanism, and will be placed in the table body of the water meter inlet, when the tap water to the outside in the form of dripping out of the water, the magnetic pressure-sensitive mechanism will be intermittent water supply to the water meter, so as to make the meter metered, in this way, can make the meter's starting flow is less than 0.5 L / H, but this structure of the water meter. Due to the use of a magnetic column as a piston, so the most afraid of rust, iron and mud and sand and other impurities in the water, its magnetic column is most likely to be stuck by the impurities in the water and no longer has the function of anti-drip;

2, the second type of anti-drip water meter is to use a small pipe or a small hole will be a small flow of tap water led to the impeller box of the water meter and the impeller of the core of the table for injection, the small flow of water kinetic energy is concentrated in a point to go up to Push the impeller, so that the impeller rotation to achieve the purpose of measuring the small flow, this way of water meter can make the starting flow rate of 2 L / H, but this structure of the water meter due to the small flow rate concentrated in one place on the water meter for spraying, which will cause the water meter of the multi-measurement, which will be due to the unstable water pressure of the water network water meter to produce a large latent (i.e., in the user will be turned off all the faucets and do not use the water) When, because of the network water pressure instability caused by the water meter for the phenomenon of idling), this latent generally up to 192 liters / day (a month even if the water will not be empty to go 5 ~ 6m? of tap water), leading to users to pay the water bill unjustly, resulting in user complaints and refused to pay the phenomenon of the occurrence of the water bill, this structure of the other defect is very easy to be blocked by the sand and mud and jammed, after a period of time (usually three to five months) After a period of time (usually three to five months), it loses the function of anti-drip;

3, the third type is diaphragm integral anti-drip water meter, which is in the case of ordinary water meter at the bottom of the case to do another cavity, the upper structure is still the same as the ordinary water meter, which is separated by a soft diaphragm with a sealed, the bottom cavity and the water case outlet, there is a special anti-drip mechanism inside the outlet, when the tap water in the form of drip drip outward, the anti-drip mechanism will still be the first time to prevent water from dripping. At first, the anti-drip mechanism will still be closed to the water meter outlet, the water dripping out is actually the water in the bottom cavity of the water meter, when the water in the bottom cavity (volume of 36 ml) is dripped out, the anti-drip mechanism will be opened, so as to replenish the discharged water to the bottom cavity, the cavity of the water is replenished, the anti-drip mechanism in the spring under the action of the water meter outlet is sealed, and then into the next Cycle, in the anti-drip mechanism to open the bottom cavity to replenish the water process is a process greater than the starting flow rate of the water meter, so the water meter can be measured.