Dry vacuum system keeps it clean
A
Welch Pumps product story
Edited by the Engineeringtalk editorial team
Oct 21, 2003
Welch's self-cleaning dry vacuum system is ideal to use with concentrators, gel dryers, or a rotary evaporator for stripping low-boiling-point solvents such as pentane, alcohol or methylene chloride.
Welch's self-cleaning dry vacuum system is ideal to use with concentrators, gel dryers, or a rotary evaporator for stripping low-boiling-point solvents such as pentane, alcohol or methylene chloride.
The system's two-stage, flexible diaphragm pump resists chemical vapours thanks to fluorinated plastics used on all wetted surfaces - including the diaphragm itself.
Pump operates without oil, delivering a vacuum to 12mbar with a free air displacement of 34 litre/min.
Plus, patent pending self-cleaning purge automatically runs for 2min at shutdown to rid pump of residue - ensuring a longer service life and reducing downtime.
Other added protective features include: a glass inlet separator that helps prevent the pump from ingesting liquids or particulates; a gas ballast or vent switch to minimise condensation when pumping heavy vapour loads; and an exhaust separator that collects any liquid droplets or particulates flushed from the pump during the purge cycle.
In addition, adjustable bleed valve mounted directly on system lets users regulate the vacuum level, while a dial pressure gauge permits monitoring of set value - a feature especially useful when pumping low-boiling solvents to minimise foaming or bumping within the flask (handles flasks up to 5 litre).
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