Rotary Vane Vacuum Pumps & Compressors

Elmo Rietschle oil-lubricated rotary vane vacuum pumps are used in a wide variety of industrial applications. We offer the largest range of oil-flooded vacuum pumps for both industrial coarse and fine vacuum operations.

Quietest Rotary Vane Pump on the Market
Experience quieter operation with our rotary vane pumps designed to reduce noise levels.

Smaller Size and Lighter Weight
Our compact and lightweight design makes installation and relocation easy.

Improved Eco Performance
Our pumps are not only efficient but also environmentally friendly, ensuring sustainable operations.

XD Heavy Duty Models Available for Wet Applications
Our robust rotary vane vacuum pumps are ready to handle wet applications with high efficiency.

V-Series Oil Lubricated Vacuum Pumps Products

V-Series Oil Lubricated Vacuum Pumps Products

Dry Running Rotary Vane Vacuum Pump Operating Principle

Rotary vane pumps work on a simple principle: pressure increases as volume decreases. This clever design is perfect for pressure, vacuum, or a combination of both.

Imagine a rotor inside a cylindrical casing, positioned off-center, almost touching the top of the cylinder. The rotor has slots with blades, or vanes, inside. When the rotor spins, these blades are pushed out by centrifugal force and slide against the inner surface of the cylinder, creating cells between the blades. These cells constantly change volume as the rotor turns.

Air enters through the inlet port into one of these cells until the rear blade reaches the end of the inlet port. At this point, the cell is at its maximum volume. As the cell moves away from the port, its volume decreases, compressing the air and increasing the pressure. This process continues until the pressure in the cell exceeds that in the pressure chamber, causing the compressed air to exit through the outlet port.

Some models have exhaust valves to prevent backflow when the maximum pressure is reached. In a vacuum pump, the process is similar, but instead of increasing pressure, the cell reduces pressure, with the chamber remaining at atmospheric pressure.

With pressure-vacuum pumps, the lower end of the vacuum inlet port is moved forward, allowing the cell to fill through a second inlet. To maintain the vacuum, this second inlet is located about one cell segment away from the main suction port. The ratio between vacuum and pressure capacities can be adjusted by selecting the appropriate inlet port.