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Proven technology for your applications

Leybold RUVAC WA /WAU roots blower are secondary pumps equipped with flange-mounted air-cooled standard three phase motors for flexibility and are excellent for atmospheric pump down applications owing to its integrated equalization line and the bypass valve.

RUVAC WA / WAU roots blowers are equipped with radial shaft sealing rings made of FPM (FKM) (fluor polymer) for longer service intervals. RUVAC WAU roots blowers have an additional integrated pressure equalization line and a differential pressure bypass valve. These blowers are supplied with a vertical pumping flow as a standard but can be changed to horizontal flow if required.

RUVAC WA / WAU being dry roots blowers are environmentally friendly as well as air cooled saving costly water usage/disposal as well as water circuit maintenance costs. RUVAC WA / WAU have proven reliability and performance in many applications such as heat treatment, food packaging, and freeze drying. 


User advantages

  • Two air-cooled lines WA/WAU, each with four pump sizes
  • Flexibility with custom motors for special voltages and explosion proof compliance
  • Variants with ATEX Cat.3i/o available, All WA(U) pumps comply as a standard with ATEX Cat. 3i
  • Easy maintenance and replacement of shaft sealing rings
  • Integrated pressure equalization line for protection against overloading at high pressures on WAU models
  • Conversion from vertical to horizontal flow onsite

Supplied equipment

  • Mineral oil LVO 100 is used as standard lubricant
  • Gasket in the intake flange equipped with dirt sieve
  • The required lubricant filling is included in separate bottles

Reliable and trouble-free vacuum

RUVAC WA/WAU roots blower is a standard equipment in the architectural glass coating industry. Combined with established oil sealed SOGEVAC pumps or DRYVAC pumps, they deliver the shortest pump down time at the load lock chambers. Combined with the dry compressing DRYVAC and SCREWLINE pumps, they assure a dry, reliable and trouble-free vacuum at the process chambers.

Fast cycle time

RUVAC WA/WAU roots blower is used in many applications to achieve the shortest possible cycle times. Wherever fast evacuations are important, for example in supporting load lock chambers or in high-speed food packaging.

High pumping speed at low pressures

RUVAC WA/WAU roots blower quickly reaches a pressure of less than 10-3 mbar for thin film coating applications, prior to the vapor deposition processes or degassing electrolytes for Lithium-ion battery manufacturing processes.


Achieve large capacity

RUVAC WA/WAU blowers deliver the capacities required for large production processes such as silicon monocrystal pulling to manufacture the basic material for semiconductors and solar cells. We would be pleased to offer you our extensive product and applications support and know-how.


Root blowers with air-cooled hermetically canned motor

Leybold RUVAC WS roots blower is driven by air or water-cooled canned motor. The available frequency converters have been matched to the pump so that the possibility of mechanical overloading it is excluded. In the case of a pressure difference which is too high, the rotational speed of the pump is automatically reduced until its load. Roots vacuum pumps of the series RUVAC WSU are provided with an additional integrated pressure equalization line and a differential pressure valve. Pumps from these series are supplied with a vertical pumping action as standard. 

  • Two air-cooled lines WS/WSU, each with four pump sizes
  • Highly leak-tight air-cooled pumps driven by air-cooled canned motor
  • Lubricated with mineral oil (alternatively with LVO 400)
  • Over-temperature switch in the stator coil of the motor
  • All elastomer seals made of FPM (FKM)/Viton
  • Integrated pressure equalization line with differential pressure valve prevents overloading on WSU model (optional)
  • A frequency converter can be used to operate the RUVAC WS 251 to 2001 pumps between 20 and 100 Hz
  • No shaft feedthrough to the atmosphere, thus particularly leak-tight
  • Conversion from vertical to horizontal pumping action can be done from the side of the customer


Supplied Equipment

  • The required quantity of oil is supplied separately with the pump (exceptions from this are indicated)
  • If no other type of oil is stated, then mineral oil LVO 100 is used as standard
  • Purged with nitrogen for corrosion protection
  • Gasket in the intake flange with integrated dirt sieve

Roots vacuum pumps of the series WAU/WSU/WHU are provided with an additional integrated pressure equalization line and a differential pressure valve.


Maximum efficiency, reduced pump downtime

The RUVAC WH / WHU series pumps are high throughput, hermetically sealed, water cooled roots blower pumps with high efficiency motors that provide optimum price-to-performance ratio and high pumping speeds up to 9800 m³/h @ 70 Hz with optional frequency converter. Both motors and oil reservoirs are water cooled thereby perfectly balancing the internal temperature management of the pumps. You benefit from significantly lower oil temperatures and hence a longer oil service life.

The potted motors replace the can for hermetically sealed drives delivering increased efficiency equivalent to the IE2 or IE3 requirements of the efficiency standard. As the potted motor design does not require bearings, service intervals are longer and pump failure is minimized.

RUVAC WH pumping speed can be increased and pump down time can be shorten by using optional frequency converters.

RUVAC WHU pumps are equipped with a bypass line and may be operated at its maximum power from atmospheric pressure. The WHU is equipped with improved valve technology for maximum efficiency in short cycle operation. The integrated bypass line allows for the WHU pumps to be operated starting at atmospheric pressure while the unique control flap provides extreme contamination resistance.

RUVAC roots blower deliver high capacities for applications such as architectural glass coating where short cycle time are critical. Backed by the proven oil sealed SOGEVAC pumps or the dry compressing DRYVAC and SCREWLINE pumps, the RUVAC pumps deliver the shortest pump down time for loadlock chamber applications and optimized pumping for trouble-free vacuum in process chamber applications. 

User advantages

  • Trouble-free operation with toxic or corrosive media owing to the hermetically sealed motor
  • Compact design with minimized space requirements
  • No shaft seals towards atmosphere, therefore high reliability, long service intervals and no oil leaks
  • Easy system integration
  • Optional frequency converter for high pumping speed up to 9800 m³/h @ 70 Hz
  • Lower energy costs with innovative motor technology
  • Integrated water-cooling system for installation in air-conditioned production site
  • Stainless steel parts in contact with cooling water (corrosion-free)


RUVAC WH / WHU roots blowers are used in many applications to achieve the shortest possible cycle times such as high-speed food packaging.


RUVAC WH  /WHU roots blowers quickly reaches a pressure of less than 10-3 mbar for thin film coating applications, prior to the vapor deposition processes or degassing electrolytes for Lithium-ion battery manufacturing processes.

RUVAC blower is also used for the manufacturing of silicon mono-crystal, the basic material for the manufacture of semiconductors and solar cells. We would be pleased to offer you our extensive product and applications support and know-how.