Self-Cleaning Dry Vacuum Pump

Welch's system is suitable for use with rotary evaporators for stripping low-boiling-point solvents such as pentane, alcohol or methylene chloride or for concentrators. The system's two-stage, flexible diaphragm pump resists chemical vapors due to fluorinated plastics used on all wetted surfaces, including the diaphragm. The pump operates without oil, delivering a vacuum to 12 mbar (9 Torr) with a free air displacement of 1.2 cfm (34 l/min). Self-cleaning purge automatically runs for 2 min at shutdown to rid pump of residue, ensuring a longer service life and reducing downtime.