Single stage, direct driven, oil-sealed and air cooled. A rotor with three vanes is positioned inside the pump cylinder and it is supported by means of two bearings. Single stage vacuum pump has an inbuilt gas ballast valve with easy accessibility; by this feature the condensable gases or vapors can be removed depending on different applications. Single Stage Vacuum Pump has one of the simplest and most reliable oil recirculating systems; the oil circulation in pump chamber for sealing, lubrication and cooling of the pump is recycled from the pump’s oil reservoir.