Claw pumps are dry-running, oil-free positive-displacement vacuum pumps using two claw-shaped rotors. The rotors do not touch each other or the casing — no oil lubrication in the process gas path, ensuring 100% oil-free vacuum. Ultimate vacuum: ≤1 mbar absolute. Flow: 100–1500 m³/h. Power: 1.5–75 kW. Suitable for clean gas, slightly corrosive vapours. Not suitable for condensable vapours, liquids, or high-solid-content gas streams.
| Parameter | Value |
| Flow Rate | 100–1500 m³/h |
| Ultimate Vacuum | ≤1 mbar (absolute) |
| Power | 1.5–75 kW |
| Operating Principle | Dry-running claw rotor (non-contact) |
| Lubrication | Oil-free in gas path — gear box oil-lubricated separately |
| Medium | Clean gas, slightly corrosive vapours |
What is the advantage of a claw pump over a liquid ring vacuum pump?
Claw pumps produce 100% oil-free, dry vacuum — no sealing water contamination of the process gas. They achieve deeper vacuum (≤1 mbar vs ~30 mbar for liquid ring) and do not require a sealing water supply or separator. The trade-off: they cannot handle liquids or condensable vapours — a liquid ring pump is better for wet gas applications.
What is a dry claw vacuum pump?
A dry claw vacuum pump generates vacuum without oil in the pumping chamber, reducing process contamination risk for suitable clean industrial applications.
Can a claw vacuum pump run dry?
Dry claw pumps are designed for dry operation, but the exact allowable conditions depend on the selected model and process gas.
When should I choose a claw pump instead of a liquid ring pump?
Choose a dry claw design when oil-free, dry vacuum operation and low contamination are priorities; choose liquid ring technology when wet gas or condensables dominate.
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