Oerlikon Leybold Vacuum introduces the RUVAC WH Roots pump series, an innovative new product line that meets the increasingly demanding vacuum needs of the solar and process industries and other applications with stringent requirements of operating pressure, cycle times and system uptime, thus increasing customer benefit.
The new WH series includes the RUVAC WH 4400 and WH 7000 Roots pumps. They use a unique, hermetically sealed motor and integral liquid cooling technology to deliver the industry's smallest, most robust and most energy-efficient package, while also achieving new levels of vacuum performance including the possibility to start the pumps at atmospheric pressure with the optional by-pass-line.
By eliminating the metal 'can' traditionally used to isolate the motor from the vacuum line, and replacing it with an epoxy-encapsulated enclosure, the RUVAC WH can use a smaller and more-efficient motor that operates at a lower temperature. This approach also reduces energy consumption considerably, eliminates shaft seals and their potential for leaks and provides outstanding performance with corrosive and toxic gases and vapors. Moreover, the WH series sets new standards for compact design, taking up less space than any competing Roots unit.
Also contributing to the RUVAC WH’s compact footprint is integrated liquid cooling in the gear cover and motor housing, which reduces half the amount of heat radiated into the ambient area — offering additional savings in air conditioning and extending the life of the power train.
The new drive design and the advantage of having no shaft seals, offer unique robustness, compared to any traditional design. This new type of pump will set new standards in reliability, even in harsh applications.


The RUVAC WH line is designed and engineered especially for the increasingly demanding vacuum-system requirements of the solar energy industry, metallurgy and furnaces, industrial coating, research and development and space simulation applications. With an optional frequency converter, the WH7000 can operate up to 9.800 m³/h @ 70Hz, while the WH4400 can operate up to 7.040 m³/h @ 80Hz.