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Roots Vacuum Pumps 2016

­rotate in oppo­site directions inside the pump housing the figure-of-eight rotors are synchronized by a gear which ­ensures that the ... con­tacting in rotor positions i and ii see figure “operational diagram of a single-stage ... v­ ertical pumping action” the volume of the intake is increased as the rotors turn ... further to position iii a part of the vol­ ume is cut off from the ­intake