YK08-0028-DI-002-08
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2. Pump Outline
2.1 Characteristics
The VD151 and VD201 are a compact, low noise, Gaede type two-stage vacuum pump that
permits high speed rotation. Since the pump is small, light, and quite simply constructed, it is
easily maintained and repaired.
Features of this pump include the following:
1) Employment of lubrication pump system
This provides stabilized pumping performance in continuous pumping operation under near
atmospheric pressure.
2) Employment of hydraulic oil anti-sucking system
If the power fails or the pump is stopped for a long time without venting the intake side to
atmospheric pressure, the pump oil- will flow back to the cylinder, making restart difficult.
This pump is equipped with the oil anti-sucking feature to minimize the amount of oil flowing back
to the cylinder and to reduce the load at restart of the pump..
3) Employment of variable oil level system
This pump has a wide oil level indicating range to allow easy control of oil level. The pump is
operable if the oil level is within this oil level indicating range during operation.
4) Employment of gas ballast function
This product is installed with the Gas ballast function as standard. This proves effective when
pumping condensable gas, such as water content, organic solvent and the like.
