# 7.5 kW liquid-ring vs regenerative vacuum (AG-VACUUM/LR/75T vs AG-VACUUM/RB)

- Source-Date (SAST): 2023-07-28 14:24
- Dest: public
- Review-after: 2027-02-28
- Status: current

## Facts

- **AG-VACUUM/LR/75T**: 380 V 7.5 kW liquid-ring, ~1440 rpm, about 0.097 MPa vacuum, 10 L/min fluid / 4.66 m³/min air, ~69 dB, **needs water**. High vacuum, low airflow. For **flat/thick** stock and MDF spoilboard; table **seal** matters — leaks kill vacuum.
- **AG-VACUUM/RB**: 380 V 7.5 kW 16 A regenerative blower ~550 m³/h, 56 kPa, silencer + relief valve, **no water**. High airflow; as vacuum it yanks air through a **porous or drilled** spoilboard. Best for **thin floppy** sheets (plastic under ~6 mm). Also used to blow air.
- Both 7.5 kW pumps are very noisy (even with silencer).
- Sales steer: thin floppy plastic sheet → regenerative; **everything else → liquid ring**.