Vacuum technology
Claw
Contact-free, dry, efficient at rough vacuum.
Schematic section, not to scale
How it works
Claw vacuum pumps use two claw-shaped rotors that turn in opposite directions without touching each other or the housing. With no friction in the compression chamber they run dry and need little routine maintenance.
Synchronising gears keep two claw rotors in phase. Gas is drawn in, trapped between the claws and the housing, compressed internally and discharged.
Performance range
Rough vacuum, typically to roughly 20-150 mbar(a) depending on design
Typical industry range. Exact capability is model specific, see each model’s curve.
In the catalogue · 347 models from 13 manufacturers
- Pumping speed
- 18 – 1,320 m³/h · 315 models
- Motor power
- 0.522 – 29.8 kW · 257 models
- Noise level
- 62 – 92 dB(A) · 138 models
- Weight
- 6.49 – 953 kg · 127 models
- Ultimate pressure
- 0.006 – 600 mbar · 80 models
- Max. vacuum
- 24 – 28.5 inHg · 13 models
- Max. pressure
- 0.6 – 1 bar · 2 models
Spread of each model’s own rated figure, as published by its manufacturer.
Advantages & tradeoffs
- No wearing parts in the compression chamber
- Oil-free exhaust
- Well suited to VSD control
- Higher purchase price than vane pumps
- Gearbox oil still requires service
- Noise needs attention in some installations
Best applications
Common in Woodworking + CNC, Packaging, Food + Beverage, Plastics, Medical, Electronics, General Manufacturing.
Maintenance
Gearbox oil changes, inlet filter care, bearing service intervals per OEM.
Energy characteristics
Specific-energy comparisons (kW per unit of flow at your operating point) appear here as sourced performance curves are added. Until then, compare models directly on the Performance Map.
Open the Performance Map