The Lobes rotates in the opposite direction of each other by the help of timing gears and thereby the internal volume is swept out in a unidirectional manner. The roots blowers (Vacuum Boosters) are used for moderately higher pressure and are also used for boosting the vacuum in a vacuum systems by providing a boost of high volumes of air in the lower pressure inlet zone of the Vacuum Pump.Two Lobes are fitted in perpendicular position to each other sharing the same central line of the casing. The Lobes rotates in the opposite direction of each other by the help of timing gears and thereby the internal volume is swept out in a unidirectional manner.