The dry-running claw vacuum pump is an oil-free, non-contact vacuum pump for clean and slightly corrosive gas streams where the process must not be contaminated by oil or sealing water.
Two claw-shaped rotors turn without touching each other or the casing, so the pumping chamber runs dry and needs no sealing liquid; capacity covers 100–1500 m³/h to an ultimate vacuum of 1 mbar (absolute) or better, with motor power from 1.5 to 75 kW.
Because there is no sealing water, there is no water supply, no separator and no water-temperature control to maintain — and the vacuum reached is deeper than a liquid ring pump can hold.
The trade-off is that the inlet stream must stay dry: liquids, condensable vapours and high-solid-content gas are outside this design, and those wet duties belong to a liquid ring pump such as the 2BV series.
| Parameter | Specification |
| Type | Dry-running claw vacuum pump (positive displacement) |
| Rotors | Two non-contacting claw rotors — no metal-to-metal contact |
| Capacity | 100–1500 m³/h |
| Ultimate vacuum | ≤1 mbar (absolute) |
| Power | 1.5–75 kW |
| Lubrication | Oil-free in the gas path; gear box oil-lubricated separately |
| Sealing liquid | None used |
| Medium | Clean gas and slightly corrosive vapours |
| Not suitable for | Condensable vapours, liquids and high-solid-content gas streams |
| Utilities | No sealing-water supply, separator or water-temperature control |
| Duty | Continuous dry vacuum duty |
| Parameter | Specification |
| Capacity | 100–1500 m³/h |
| Ultimate vacuum | ≤1 mbar (absolute) |
| Motor power | 1.5–75 kW |
| Operating principle | Dry-running claw rotor, non-contact |
| Compression | Dry compression — no sealing liquid or oil in the gas path |
| Lubrication | Gear box oil-lubricated separately from the gas path |
| Gas path | Oil-free; no sealing water enters the pumping chamber |
| Gas stream tolerated | Clean gas and slightly corrosive vapours only |
| Not suitable for | Condensable vapours, liquids and high-solid-content gas |
| Utilities required | Electrical supply only — no sealing water or separator |
| Duty | Continuous dry vacuum duty |
The claw range is published as a capacity and configuration range rather than a numbered model series. Confirm capacity and ultimate vacuum together, because the achievable capacity falls as the working pressure approaches the ultimate vacuum.
- Rotor set: two claw-shaped rotors run without contact, so there is no wear between the rotors or between a rotor and the casing.
- Gas path: oil-free — no oil or sealing water enters the pumping chamber, which protects the process gas and removes the separator from the system.
- Lubrication: the gear box is oil-lubricated separately from the gas path, so gear oil stays out of the vacuum chamber.
- Utilities: no sealing-water supply, water separator or water-temperature control is needed, which simplifies installation.
- Materials: wetted and sealing materials must be matched to gas corrosivity and to any abrasives present — state these with the enquiry.
- Motor: 1.5–75 kW depending on capacity; confirm voltage, frequency and duty.
- Oil-free vacuum: supplies vacuum where oil contamination of the process is not acceptable.
- Chemical vapours: handles clean and slightly corrosive vapour streams in chemical and process plants.
- Semiconductor and electronics: provides clean, dry vacuum for semiconductor and electronics manufacturing steps.
- Food packaging: supports dry vacuum on food packaging lines where oil mist must be avoided.
- Solvent recovery: aids solvent recovery duties where an oil-free gas path is required.
- Pharmaceutical: used on dry vacuum duties in pharmaceutical processing where contamination is controlled.
- Confirm the required ultimate vacuum and the capacity at the working pressure, not just at atmospheric pressure.
- Match motor power within the 1.5 to 75 kW range to the gas load and the target vacuum.
- Check the vapour and condensable load: a dry claw pump handles dry process gas and is not suited to condensing vapour.
- Note any corrosive or abrasive gases, because they determine the rotor and casing materials and the clearances.
- Allow for the absence of sealing water in the design — no water supply, separator or drain is required.
- State the inlet temperature and whether any liquid droplets can carry over from the process.
Does the claw vacuum pump use oil?
No. The dry claw design is oil-free and non-contact, so the pumping chamber is free of oil and sealing liquid; the gear box is lubricated separately from the gas path.
What capacity and vacuum does the dry claw pump cover?
Capacity covers 100–1500 m³/h with an ultimate vacuum of 1 mbar (absolute) or better and motor power from 1.5 to 75 kW.
Where is a dry claw pump used?
It is used for oil-free vacuum, chemical vapours, semiconductor and electronics vacuum, food packaging and solvent recovery.
Can a claw pump handle wet gas or condensable vapours?
No. Liquids, condensable vapours and high-solid-content gas are outside the dry claw design; those duties are better served by a liquid ring vacuum pump.
Does the claw pump need a sealing-water supply?
No. It requires an electrical supply only — there is no sealing water, no water separator and no water-temperature control in the system.
Related Products
- Vacuum Pump (2BV2 / 2BV5 / 2SK / SK)
How to Choose a Dry Claw Vacuum Pump
Quick answer: Size a dry claw pump from the working pressure, the gas load at that pressure, and the gas composition. The range covers 100–1500 m³/h to ≤1 mbar (absolute) with 1.5–75 kW, and suits clean or slightly corrosive dry gas.
When is a dry claw pump the right choice over a liquid ring pump?
Choose the dry claw design when the duty needs an oil-free, dry vacuum and there is no sealing water to supply or treat; it also reaches a deeper vacuum (≤1 mbar absolute). Choose liquid ring technology instead when the inlet stream is wet, carries condensable vapour or contains droplets — see the vacuum pump selection guide.
How do I size the pump?
Read the pumping speed at the working pressure rather than at atmosphere, add the air in-leakage to the process gas load, then pick the capacity whose curve covers that load at the target pressure with motor power inside the 1.5–75 kW range.
What has to be confirmed before ordering?
Gas composition and corrosivity, inlet temperature, whether droplets or condensables can carry over, the target working pressure, and the electrical supply — because these set the materials and the model.
Selection Data to Send Our Engineers
- Required working pressure (mbar absolute)
- Gas load / pumping speed at that pressure
- Gas composition and corrosivity
- Inlet temperature and condensable content
- Motor supply and duty
- Material requirements for the gas path
Industry Applications
Explore how this equipment can be applied in related industrial sectors and review application-specific selection guidance.