U 4.20
U 4.40
... The standard-featured circulating-oil lubrication system with integrated oil cooler and cover additionally minimise noise emission. Controlled by a float valve, the oil return suction system also makes these vacuum pumps suitable for use in rough-vacuum applications. Optional water cooling significantly prolongs the life of the oil, even in difficult ambient conditions.
Optional gas ballast valves prevent condensing vapours from contaminating the pump oil. The oil-water emulsion arising from contamination reduces the pump effi ciency or leads to a failure. The valve permits a regulated amount of fresh air (the gas ballast) to fl ow into the pump‘s compression chamber. By mixing saturated intake air with unsaturated fresh air, condensing is suppressed.
The new generation of oil-lubricated rotary vane vacuum pump: U 4.300
The new size between U 4.250 and U 4.400.
U 4.300 - U 4.250: comparison and differences:
