SINGLE-FLOW OR MULTIPLE-FLOW VANED WATER METER

摘要

Described is single-jet or multi-jet impeller-type water meter with a device for compensating for errors due to ageing, the device having one or more pipes, or flow-retarding ribs with grooves, located in a measurement chamber. When the meter becomes dirty, the increase in rpm this causes is automatically compensated for since the flow cross-section of the pipes is simultaneously decreased, thus leading to increased throttle losses, or the effective cross-section of the flow-retarding ribs is increased. These devices can also be used for the initial adjustment of the meter.