Welch Belt Driven Vacuum Pumps

Welch belt driven vacuum pumps are renowned worldwide for their exceptional durability, cooler operation, and long service life. The slow-speed belt-drive design (typically 525–580 RPM) reduces wear, runs much cooler than direct-drive pumps, and features large oil reservoirs that better tolerate chemical vapors and contaminants.

Why Choose Welch Belt Driven (DuoSeal) Pumps?

• Deeper ultimate vacuum — down to 1×10⁻⁴ Torr
• Superior vapor handling capacity
• Proven reliability in laboratory and industrial environments
• Easy and economical maintenance
• Available in standard DuoSeal, ChemStar (chemical-resistant), and refrigeration service versions

Popular Welch Belt Drive Models We Carry:

• 1400 Series – 0.9 CFM (Compact lab & Schlenk lines)
• 1402 Series – 5.6 CFM (Best-seller for rotovaps, vacuum ovens, and general lab use)
• 1376 Series – 10.6 CFM (Mid-range workhorse)
• 1397 Series – 17.7 CFM (High capacity)
• 1374 Series – 23 CFM (Largest industrial models)
• ChemStar (N-series) – Chemical-resistant versions with Welch Gold Oil compatibility

Best Applications by Model Size

• Small (1400 Series): Schlenk lines, small vacuum ovens, degassing
• Medium (1402 Series): Rotary evaporators, vacuum distillation, refrigeration service
• Large (1376 / 1397 / 1374 Series): Industrial vacuum systems, freeze dryers, vacuum furnaces, backing turbopumps

Whether you need a complete pump, unmounted bare pump, Fomblin-prepared unit, or refrigeration service model (–46 versions), Chemtech Scientific is your trusted source for genuine Welch belt driven vacuum pumps, parts, repair kits, and full rebuild service.

Academic & Research Discounts Available — Contact us for special pricing.