ALMA vacuum rotary feedthroughs:
flexible, reliable, compact and efficient

Universal mounting system for precision connections

ALMA feedthroughs are used when rotary motion has to be transmitted into pressurized or vacuum vessels, which must be sealed against gaseous media.

The flange designed by ALMA allows precise assembly in the recipients, as the rotary feedthroughs are equipped with two alternative centering devices on the vacuum side.

Tried and tested mounting threads, in two sizes on the vacuum side, offer the user a high level of flexibility when installing a wide variety of follow-on components.

Advantages of the ALMA flange design

  • Highly flexible mounting geometries
  • High installation and positional accuracy
  • Simple, exact centering
    (no additional parts required)

Intelligent bearing design

The sophisticated bearing design in all ALMA rotary feedthroughs offers numerous safety features and extreme precision, ensuring optimum true running properties and high load-bearing capacities.

Advantages of the ALMA bearing design

  • High-precision bearing fits
  • Use of precision bearings with high tilt rigidity
  • Exceedingly high true-running accuracy
  • Highest load-bearing capacities
  • Low drag torque
  • No slip-stick phenomenon
  • Bearing position on the atmospheric side protects against potential contamination of the vacuum

Compact design with top load-bearing capacities

When designing rotary feedthroughs, ALMA focuses on creating the smallest possible design envelope for the maximum load-bearing capacity. Thus, we have already been able to design customer-specific rotary feedthroughs, which achieve, for example, an axial load-bearing capacity of 10,000 N and a radial load-bearing capacity of 1,000 N for a housing diameter of only 84 mm and a length of only 62 mm.

Another example of a rotary feedthrough designed by us with an excellent performance/size ratio is a feedthrough with an axial load-bearing capacity of 120,000 N and a maximum permissible static tilting moment of 40,000 N – for a length of only 245 mm and a housing diameter of only 600 mm.

Extremely compact rotary feedthrough, allowing very high load-bearing capacities of 10,000 N (axial) and 1,000 N (radial) respectively for its very compact design envelope of only 84 x 62 mm.