V-KTA40/60/80 Vacuum Pump Repair

   The dry-running rotary vane pressure vacuum pump with IE3 motor has bearings on both sides of the rotor. Capacity ranges from 55 to 90 m³/h, vacuum up to -0.6 bar, and pressure up to +0.7 bar. The flexibility to vary vacuum and compression matches the air capacity of individual applications: Version /1: standard vacuum and pressure capacity. Version /2: max. compressed air capacity. Version /3: max. vacuum capacity. High efficiency and quiet operation. The sound cover permits ducted cooling air discharge (from one side only, or from both sides and then back). Easy to service and operate. Flange-mounted motor complies with DINEN 60034 and has IP 55 protection and insulation class F.

Operating Principle of Dry-Running Rotary Vane Vacuum Pumps

Increasing pressure by reducing volume is the principle of rotary vane operation. This design provides excellent service in pressure, vacuum, or a combination of both.

In a cylindrical housing, the rotor is positioned eccentrically so that its top almost touches the cylinder. The so-called rotor blades or vanes are located in the rotor slots.

When the rotor starts to turn, centrifugal force throws the vanes out and they slide on the inner surface of the cylinder. In this way, a cell is formed between two vanes, and its volume changes continuously during rotation. 

Air enters a cell from the inlet port until the trailing vane reaches the far end of the inlet port. At this point the cell has reached its maximum volume. As the cell moves away from the port, its volume becomes smaller and smaller, so the air is compressed and the pressure rises.

This continues until the pressure in the cell exceeds the pressure in the pressure chamber, and the compressed air is then discharged through the outlet port.

Some models are fitted with an exhaust valve that prevents discharged air from flowing back if maximum pressure is reached. In a vacuum pump, the process is similar, but the pressure in the cell decreases while the chamber is at atmospheric pressure.

For pressure vacuum pumps, the lower end of the vacuum inlet is moved forward. The cell can now be filled through a second inlet. To avoid weakening the vacuum, the second inlet is located about one cell segment away from the main suction inlet. The ratio between vacuum and pressure capacity is affected by the choice of inlet port.

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