A gas ballast valve largely prevents the condensation of vapors as standard equipment from U 5.70 and up and optionally also with a larger volume flow. The gas ballast allows a metered amount of fresh air to enter the compression chamber. By mixing saturated intake air and unsaturated fresh air, condensation is kept to a minimum. The standard device hood also minimizes noise emissions.

In the U series, too, an optional water cooling system enables the use of the vacuum pump at higher ambient or suction temperatures; the service life of the lubricant is also significantly extended. A wide range of accessories ideally complements the pump for a wide variety of tasks.

The simple design with only one shaft and direct drive leads to robust, long-lasting vacuum pumps with low maintenance and operating costs. The gate valve is sealed by the dosed oil that is supplied and conveyed with it. The non-return valve and efficient oil separation are integrated in the vacuum pump, additional accessories can easily be added.

The highlights of the U 5th series:

• 8 compact sizes from 70 to 780 m³ / h Easy to install

• Shortest pump-down times in comparison

• Integrated gas ballast valve, opened 0.5 mbar absolute or optionally 3 mbar absolute for increased water vapor tolerance

• Highly efficient cooling through spiral housing with drum fan, no heat exchanger required (U 5.70 & U 5.100)

• Often lower installed motor power in direct comparison to the competition

• Standard motors in efficiency class IE3

• Variants for handling protective gas (O2)

• Oil tank with two-stage oil separation

• Highly efficient exhaust filter for the most effective oil separation

• Oil filter for a long oil service life

• Smooth surfaces for quick and hygienic cleaning

• Ideally suited for vacuum packaging of food (meat, fish, sausage, cheese ...)

• Optional extended map and range of functions through VARIAIR control technology of the entire series