The Pumps operates according to the Single Stage Claw principal. Two in oposite direction rotating claws run within a housing. The shape of the claws allows the air to be sucked inside the pump and to be compressed towards the exhaust side, so the gas exits under pressure. The in the inlet mounted anti-suckback valves prevents air flowing back to the vacuum chamber when the pump has been switched off. The two claws are synchronised by gears and the flanged motor is direct driven.