How To Install And Use Water Meter?

How to install and use water meter?

Installation of water meters:

The correct installation of a water meter is a necessary guarantee for ensuring accurate measurement. It should be installed in accordance with the national standard GB/T778.2-2007 "Measurement of Water Flow in Closed Full Pipelines - Drinking Cold Water Meters and Hot Water Meters - Part 2: Installation Requirements". The disturbance of upstream flow of water meters can cause significant errors and premature wear. There are two main types of flow disturbances: velocity profile distortion and vortices. The former is caused by obstacles partially blocking the pipeline

For example, there are partially closed valves, valves, and check valves in the pipeline. The latter is caused by two or more elbows, centrifugal pumps, etc. on different planes. This impact can be controlled by a straight pipe section upstream and downstream of the water meter that guarantees a diameter of no less than lO times the nominal diameter of the water meter. If the requirements for straight pipe sections cannot be met, a straightener can be installed. Therefore, before installing the water meter, the pipeline must be flushed to remove debris such as stones and mud. If necessary, a filter screen or filter should be installed to reduce the measurement error of the water meter.

Use of water meters:

Water mixed with air often stays in the upper regulator of the water meter and other higher spaces, directly causing the water meter to overcount. Not only that, the air in the meter also weakens the recoil effect of the regulator on water, causing an increase in the amount of water indicated by the water meter. In this case, a vent valve should be installed upstream of the water meter and frequent opening and closing of the valve should be avoided.

Otherwise, especially when closing the valve, there will be a "water hammer" phenomenon. This is because water is incompressible, and the inertial force of the water flow can instantly generate enormous pressure on valves, pipelines, and water meters. In light cases, it can reduce the lifespan of valves and water meters, while in severe cases, it can cause valve damage, pipeline rupture, or deformation of the water meter movement. Experiments have shown that as the front and rear valves of the water meter are closed, the measurement accuracy of the water meter will decrease, and the error will increase: when the valve is closed to 2/3, the error will increase by 10% or even more. Therefore, the frequency of opening and closing the valve should be minimized as much as possible.