Oil-Lubricated Rotary Vane Vacuum Pumps & Systems, NRV Series

The NASH NRV oil-lubricated rotary vane vacuum pump features a flanged motor with bearings on both sides of the rotor and oil/air heat exchanger. Standard fittings include an inlet filter, vacuum non-return valve, gas ballast valve, and oil separator. Versions are available for the handling of gases with elevated oxygen content or high moisture content. 

Operating Principle

Our rotary vane pumps operate by expanding volume at the inlet and compressing that volume at the exhaust. This is accomplished by placing the rotor eccentrically inside of the cylindrical housing, such that it is nearly touching the housing at the top, and quite far at the bottom. This rotor houses the vanes, and when it spins, centrifugal force causes these vanes to be slung out of the grooves they sit in until they contact the cylinder wall.   

Rotary vane pumps operate using an eccentric rotor and vanes to move process gases through the cylinder. As the vanes are physically in contact with the cylinder wall, lubrication is required. This lubrication also aides sealing between the sections of the cylinder, as well as facilitates heat transfer away from the pump internals. These actions combine in a way that allows oil-lubricated rotary vane pumps to be capable of very low base pressures, and as such, they are suitable for applications requiring vacuum levels as low as 0.375 Torr. 

Advantages

• Quiet Operation 
• Easy Maintenance 
• Air-cooled Design 
• Long-life Vanes 
• Compact Design
• O-ring Sealed Compression Chamber