Oil-lubricated or oil-free rotary vane vacuum pumps are always used when there are no condensable fractions in the delivered volume flow or when a better final vacuum is required. These vacuum pumps are particularly robust, have a functional construction and are ideally suited both for maintaining a certain pressure level and for evacuation processes. These vacuum pumps are versatile and do not require any operating fluid. However, continuous operation at atmospheric pressure is not recommended.
The lubricated rotary vane vacuum pumps are used when the intake flow may contain moisture, or when a better final pressure is required. These pumps may run continuously within certain pressure ranges, or connected to containers to be emptied, whose volume is appropriately sized for the pump flow rate. Long-term use at atmospheric pressure is not recommended. The lubrification allows this pumps to intake water vapour. To avoid a condensation of the water vapour, the lubricated rotary vane vacuum pumps are equipped with the gas ballast, a system that introduces air in the compression stage and changes the vapour saturation pressure thus avoiding the condensation. Into the WR pump version the gas ballast system is improved and reinforced.
Oil-free rotary vane vacuum pumps consist of a rotor in an eccentric position rotating inside a cylindrical body.
This rotor is equipped with grooves in which the vanes are inserted. Because of the centrifugal force, during the rotation the vanes are pushed into contact with the body, creating close spaces that increase their volume drawing air from the container to be emptied and expelling it from the “outlet duct”. Oil-free rotary vane pumps can run continuously both at atmospheric pressure and at the highest vacuum. However, they cannot be used when the aspirated air contains moisture, oil or other traces of liquid.
All versions can be used as compressors.
Areas of application for the versatile pumps include: vacuum packaging, thermoformers, injection molding technology, the glass industry, foundries, printing shops, carpenters, boat building.