Welch’s dry WOB-L® piston vacuum pumps solve a common lab and industrial pain point: achieving strong, oil-free vacuum performance without compromising speed, reliability, or maintenance intervals. These pumps are engineered for standard duty applications where clean operation, consistent vacuum levels, and long service life are non-negotiable.
What Makes These Pumps Stand Out
- Oil-Free Operation
WOB-L piston technology eliminates the need for oil, reducing contamination risk and maintenance.
- Wide Range of Models
17 models available, from 0.4 to 7.1 cfm free air displacement, reaching vacuum depths of 5 Torr.
- Consistent Performance
Maintains strong pumping speeds even near ultimate vacuum pressure.
- Built-In Safety
All models include 1PH motors with thermal overload protection; several are UL component certified.
- Flexible Applications
Suitable for:
- Cell culture media filtration and aspiration
- DNA/RNA/plasmid extraction
- Vacuum ovens and filtering
- Vacuum bag forming
- Sampling, pick-and-place, package integrity testing
- Turbidity and rice porosity testing
- Integrated Features
Options include vacuum controllers, gauges, catch-pots, fluid collection vessels, and tank-mounted systems.
