Welch Vacuum
Two numbers decide a vacuum pump: ultimate vacuum and pumping speed. The first is how low it can go, the second how fast it gets there. On a rotary evaporator, where solvent evaporates continuously, insufficient pumping speed means the vacuum never holds in practice.
Where solvents are involved, a chemical-resistant diaphragm pump beats an oil rotary pump: no oil changes, no oil mist, and a flow path built from materials that tolerate acid and solvent vapour, so running costs stay low.
Products
Vacuum Pumps 8
Pricing depends on quantity and lead time, so we quote individually. Just send the No. and quantity.
Welch Vacuum
Chemstar Oil pump 160L/min, 1x10-4torr
Welch Vacuum
Chemstar Dry pump, 150L/min, 5.3x10-2torr
Welch Vacuum
Full PTFE Diaphragm Pump 20L/min 2mbar
Welch Vacuum
Full PTFE Diaphragm Pump, 16.7L/min, 75torr
Welch Vacuum
SUCTION PUMP, 34L/min, 70torr
Welch Vacuum
WOB-L Piston Dry pump, 45L/min, 60torr
FAQ
Frequently asked
Which pump suits a rotary evaporator?
Most solvent distillation needs only 10–20mbar, and a chemical-resistant diaphragm pump is the standard choice. For high-boiling solvents, choose a model with lower ultimate vacuum or add a vacuum controller.
Can I replace an oil pump with a diaphragm pump?
Yes, if your required vacuum falls within the diaphragm pump range — maintenance drops sharply. Work needing high vacuum below 10⁻³mbar still requires an oil or turbo pump.
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Vacuum Pumps — need a quote?
Send the No. and quantity — we’ll come back fast with pricing and lead time.