For a domestic tap water system, water has gravity, and when the water mains network is out of water, even if the mains network has a check valve, the downstairs users of a building may use water when the water is out, so that the user's home The water in the water pipe network is likely to flow back under the action of gravity and its own pressure. And even if the water does not stop, sometimes when the pressure of the pipe network fluctuates during the peak period of water use, the tap water in the user's home will also flow back. In the process of water backflow, if the check valve is not installed, the water will pass through the tap water meter again. At this time, the water meter will count. Whether it is reversed or forward, its measurement is inaccurate. If the count is too much, the user will definitely suffer; if the count is reduced, it will also be unfair to the water company. Therefore, in order to prevent this from happening, a check valve will be connected in series with the water meter, so that the tap water can only keep flowing to the user's home without backflow, which solves the occurrence of this problem. Therefore, the water meter check valve not only prevents the backflow of tap water, but also plays a role in avoiding water meter measurement disputes.
