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Reducer flanges are available to connect different size ISO components. This catalog
includes ISO KF and ISO LF reducer flanges for KF to KF, KF to LF and LF to LF flange
combinations. Hybrid adapters are available to connect ISO KF components to other non
ISO vacuum fittings and mounts. These include Del-Seal™ CF metal seal flanges,
ANSI ASA flanges, Swagelok® compression tube fittings and VCR® metal gasket tube
fittings, national pipe thread fitting, etc.
MDC Kwik-Flange™ ISO KF flanges are available in four standard maximum tube
sizes including 3/4", 1", 1-1/2" and 2" diameters. Each of these basic flanges are
then offered in weldable formats, prepped for varying smaller tube sizes. Typically, U.S.
tube sizes are specified in inches and identified by their outside diameters. MDC
standard ISO KF flange size designations are as follows... K075 for 0.75", K100 for 1.00",
K150 for 1.50" and K200 for 2.00" tube diameters. It’s worth mentioning that, with
the exception of the centering ring locater diameter, three of the ISO KF flanges
depicted in the diagram below, namely NW 10, 20 and 32, are identical to NW 16, 25
and 40 respectively. These latter flanges being the standard for all of MDC’s ISO KF
fitted products equipment fitted with NW 10, 20 and 32 flanges can mate them with MDC NW 16, 25
and 40, respectively, by using MDC’s reducer centering ring. The reducer centering ring is
constructed with two different size tubular rims or extensions which mate with the
respective flange size centering ring locater groove or counterbore.
Inch-Metric ISO Comparision
As previously noted, Kwik-Flange™ ISO KF flanges provide a vacuum mount interface
for tube diameters up to 2.00 inches. For tube diameters above this, Large-Flange™
ISO LF flanges are used. Kwik-Flange™ and Large-Flange™ flanges are part of one and
the same family of ISO standard elastomer sealed mounts. Together they provide a
complete range of vacuum mounts for 0.75 to 20.0 inch diameter tubes. ISO KF and LF
sealing mechanisms are similar but their fastening and clamping methods differ. Due
to the wide variation of references used by ISO flange manufacturers, MDC emphasizes
the use of the standard ISO NW reference. Note that for all practical purposes, NW and
DN references are identical. Large-Flange™ ISO LF flanges are presented immediately
after the Kwik-Flange™ ISO KF flanges.
In general, MDC components compare with international components using an
inch-to millimeter ratio. U.S. sizes refer to a tube’s outside diameter, whereas international sizes
refer to a tube’s inside diameter. The chart shown on right gives a quick comparison between
inch and metric ISO flange sizes.
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