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Performance You Can Count On—Even in Demanding Lab Environments

If you're performing vacuum filtration, aspiration, or degassing processes, you need a pump that delivers consistent performance without constant oversight. The Welch Model 2585B-50 is built for that kind of reliability. It’s oil-free, low-maintenance, and designed to handle continuous duty cycles in lab and industrial settings.

This model is part of Welch’s WOB-L series, known for its rugged construction and quiet operation. With a flow rate of 1.1 CFM (31 L/min) and an ultimate vacuum of 60 Torr, it’s well-suited for medium-duty applications that require steady vacuum without contamination risk.

Full Product Manual

For installation, operation, maintenance, and troubleshooting details, download the official Welch product manual.

Key Specifications

FeatureValue
Flow Rate1.1 CFM (31 L/min)
Ultimate Vacuum60 Torr
Motor1/8HP
Voltage115V, 60Hz
Inlet/Outlet1/4"NPT
Weight18 lbs (8.2 kg)
Noise Level~50 dB (A)

 

Common Use Cases

 

  • Vacuum filtration in chemistry labs
  • Aspiration of liquids in biological research
  • Degassing of liquids in analytical setups
  • Vacuum drying of small samples

FAQs

No. This pump is not chemically resistant. For corrosive or reactive gases, Welch recommends PTFE diaphragm pumps.