Comparison of the QCF Connection with the mounting of conventional CF flanges

Assembly time

  • < 75 % less assembly time

 < 75 % less assembly time with QCF
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Nominal diameter QCF CF
DN16 30 seconds 3 minutes
DN40 30 seconds 3 minutes
DN63 40 seconds 4 minutes
DN100 80 seconds 6 minutes

    Required space / freedom of mounting

    • Ca. 50 % less space required - easy assembly even when space is limited

    Ca. 50 % less space required with QCF
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    Nominal diameter QCF [mm] CF [mm]
    DN16 24 35
    DN40 24 61
    DN63 28 80
    DN100 41 90

    Orientation of boreholes – rotatable/fixed flanges

    • QCF flanges have no screw holes.
      Thus, the orientation of the bolt circle is not applicable during welding.  
      Rotatable flanges are not necessary.

    Sealing principle / sealing material

    • Same sealing principle (ISO 3669-2) and same standard copper gasket as conventional CF connection.

    Independence of flange systems

    • By using QCF-CF adapters the most suitable connection system for the specific requirements can be used combined.

    Non-magnetic flange connection

    • VaCFix® Clamp chains are non-magnetic, in connection with QCF flanges made of stainless steel 1.4429 a UHV flange connection with a magnetic permeability <1,005 is created.
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