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Roots Vacuum Pumps 2016

than the pressure within the ­pumping chamber of the ruvac with oil pressure switch and oil drain facility purged with nitrogen for corrosion ... ­ tinuously circulated at a ­reduced system pressure processing of ferrous and nonferrous materials ... pump the bearing chambers may be evacuated to a pressure lower than the pressure within the ­pumping ... chamber of the ruvac with switch and oil drain facility purged with nitrogen for