Rotary blowers are positive displacement sliding vane machines designed with a slotted rotor mounted eccentrically in the cylinder housing blades, manufactured from a special grade of carbon.

The cylinder bore is honed to give maximum blade life. The drive end bearing arrangement gives positive rotor location and prevents mechanical contact with the end covers.

Shaft seals are fitted to prevent grease leakage from the bearings. The blade depth can be quickly checked without removal of any parts or pipework.


All machines in this range are aircooled with a fan fitted at the rear end to assist cooling. Overheating of vacuum pumps continuously working at 457mm Hg (18Hg) and above is eliminated by the introduction of cool filtered ballast air.

Motorised units are flange mounted to electric motors with a cooling fan and flexible coupling enclosed in the coupling ring. When different operating speeds are required, baseplate mounted units with vee belt drive are available.