The operation is based on a turbine or propeller whose axis is located in the flow line of the water. The design of the Hidrowoltmann counter performs hydrodynamic compensation avoiding external thrusts on the propeller shaft.
| CÓDIGO | Calibre mm | Calibre pulgadas | Caudal m3/h Qn. | Caudal m3/h Q.máx. |
| 20450 | 50 | 2" | 25 | 50 |
| 20451 | 65 | 2 1/2" | 40 | 80 |
| 20452 | 80 | 3" | 60 | 120 |
| 20453 | 100 | 4" | 100 | 200 |
| 20454 | 125 | 5" | 150 | 300 |
| 20455 | 150 | 6" | 250 | 500 |
| 20456 | 200 | 8" | 400 | 800 |
| 20457 | 250 | 10" | 600 | 1200 |
| 20458 | 300 | 12" | 1000 | 2000 |