REBUILT Edwards QMB250F QMB-250F Blower Roots Vacuum Mechanical Booster Pump - 60 Hz 208 - 230 VAC / 460 VAC 3 phase

For sale is the Edwards QMB250F Mechanical Booster Pump. They are compact and have high pumping speeds. Low system pressures can be achieved by using two or more mechanical booster pumps in series. You must use the QMB Mechanical Booster Pump with a suitable backing pump. Preferably the Edwards QDP pumps. The maximum continuous inlet pressure is 20 mbar for the QMB250F and QMB500F Mechanical Booster Pumps and 1 mbar for the QMB1200F Mechanical Booster Pumps.

The QMB250F and QMB500F pumps are air-cooled and the QMB1200F pump is water-cooled. All the QMB pumps have enclosed, water-cooled motors and are therefore suitable for applications in clean environments where fan cooling is unacceptable. The pump coupling-cover is connected to the pump outlet and forms an integral part of the vacuum system. The connecting pipelines have a filter which removes debris and so prevents contamination of the lubricating oil and bearings. For an even cleaner system, the coupling-cover and bearings can be evacuated by connection to the pump-inlet or to an external vacuum pump.

The QMB pumps are positive displacement Roots vacuum pumps. The pump mechanism is driven by a three-phase electric motor through a hydrokinetic fluid-coupling. The motor is enclosed and is cooled by integral cooling-water coils. The pump shafts and rotors are made of high-grade, corrosion-resistant, cast-iron. The internal and external shaft-seals are made of polytetrafluoroethylene (PTFE) or fluoroelastomer. The pump-bearings, gears and seals are lubricated by oil fed from reservoirs in the coupling-cover.

A series of seals stops the oil from reaching the vacuum side of the pump. The coupling-cover is evacuated. You can inspect the oil-levels through sight-glasses which are fitted to the coupling-cover. Oil-filler, oil-drain and external evacuation connections are provided on the cover. The QMB250F and QMB500F pumps have rear bearings which are lubricated by perfluoropolyether (PFPE) grease. The QMB1200F pump gears are lubricated by oil in the gear-cover. The gear-cover of the QMB1200F has oil-filler and oil-drain plugs and an oil-level sight-glass. The QMB pumps are suitable for use only with PFPE oils and have voltages of 60 Hz, 208 - 230 VAC / 460 VAC 3 phase. The price listed above is for a Edwards QMB250 Blower (Boosters) Vacuum Pump only. We also sell mechanical and blower vacuum pump systems. Please call (505) 872-0037 for more information.