The pumping system for vacuum wastewater disposal

  • Low space requirements due to compact dimensions
  • High availability due to robust duty/standby pump arrangements
  • Uncomplicated system design without the need for bulky vacuum collection tanks
  • Easy and simple maintenance due to limited No. of system components
  • Closed system means that liquids and air are conveyed in the same operation
  • Insensitive to foreign matter and clogging
  • Pump technology that is self-priming and insensitive to dry running

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VacUnit - Reliable pump technology for vacuum wastewater disposal

With its VacUnit product range, Vogelsang offers proven vacuum pumping systems for use in vacuum waste water drainage systems.

VacUnit vacuum pumping systems are used worldwide in stationary toilet waste water disposal systems for passenger trains. Other applications including sanitary marine applications, boat wastewater pump out systems, urban drainage systems or technical building equipment. The heart of the VacUnit pumping systems is based on Vogelsang VX series rotary lobe pumps. The VX pumps ability generate a strong vacuum allows to transport the effluent in a wastewater-air mixture directly in the same working step. It is not necessary to separate the liquid and gas phases with the VacUnit, as is the case with conventional systems with correspondingly large vacuum collection tanks. Additional units and equipment to pump air and wastewater separately are thus not required.

Compared to conventional vacuum pump stations, this reduces the number of technical components and thus the maintenance effort required to a minimum. Thanks to Vogelsang's "QuickService" concept, maintenance and service can also be done quickly and easily.

In addition to the classic version as a double pumping station, the VacUnit is also available as a single pump system. By using the VX100, VX136 and VX186 pump series, the VacUnit can be adapted to suit different requirements and capacities.

As a rule, the VacUnit vacuum pumping station is supplied as a factory-tested complete unit on a common frame with a preconfigured, integrated control system.

To Transportation World

Vogelsang solutions for applications in the world of transportation

Vogelsang is the specialist for supply and disposal as well as cleaning solutions in the railway, bus and boat sectors. We also offer our customers solutions for operational data management in these markets.

If you would like to find out why we are number one for supply and disposal in the German rail sector, then visit our world of transport technology.

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Our products with VX series rotary lobe pumps are constructed according to an ingenious design concept, called QuickService design. This concept makes maintenance and repair of the equipment particularly easy. Systems are available again in a very short time, with downtimes minimized


To ensure safe operation outdoors even at freezing temperatures and to protect the technical equipment from frost, optional electric heating elements can be used.
The control of the VacUnit can be fitted with required interfaces to allow for local or online analysis of operating data, condition monitoring and remote diagnosis. The VEBSys web portal can be used for remote internet access and online support regardless of the systems location. The central control of the VacUnit set up as master unit can also be used to monitor remote service stations connected as clients, such as TUnit MP service modules.
Installation of the VacUnit in a walk-in 20‘ or 40‘ system container designed as a machine room, with sufficient space for additional technical equipment. Customized versions and equipment configurations are available on request.
Compact enclosure made from an aluminum tube frame with insulated wall and door elements. Removable maintenance covers give easy access to the units.

The Vogelsang VX pumps used in the VacUnit are self-priming positive displacement pumps. The special design of the pumps, which are insensitive to dry running and foreign bodies, allows both the pumping of liquid media and efficient vacuum generation in vacuum drainage systems.

Vacuum drainage is one of the special drainage processes in waste water technology.

The driving force for the transport of waste water in the connected pipes is the pressure drop between the external ambient air pressure and the reduced pressure level within the pipe system.

The automatic control of the VacUnit ensures that the system typically  operates within a range of -0.30 to -0.60 bar.

During a suction process at a remote disposal station, the waste water thus enters the vacuum line. The air flowing into the vacuum piping system causes turbulent mixing of the liquid and air phases and accelerates the medium in the direction of the vacuum pumping station.

In this way, the mixture of waste water and air flows towards the VacUnit. The flow process is additionally supported by laying the vacuum line with a slight slope of approx. 0.2% in direction of flow.

The mixture of waste water and air sucked in by the VacUnit on the inlet side is then pumped directly via a pressure line to the desired discharge point or to a waste water treatment plant.

As the VacUnit does not require a vacuum collection tank, it is not possible for fibrous waste water contents to accumulate and become entangled in the system. The problem of impellers clogging due to fiber clumps like this, which is familiar in free-flow sewage pumps, is thus safely avoided.

The Vogelsang pumps, driven by three-phase electric motors, are also characterized by low noise emissions and particularly quiet running.