Vacuum flange

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A vacuum flange is a flange at the end of a tube used to connect vacuum containing vessels, tubing and vacuum pumps to each other.

Several vacuum flange standards exist, and the same flange types are called by different names by different manufacturers, which can cause some confusion.

The ISO standard quick release flange is known by the names Quick Flange (QF), Klein Flange (KF), ISO-K or NW. It is a conical flange attached with a circular clamp.

The ISO large flange, known as LF, LFB, MF or sometimes just ISO flange, is attached with claw clamps (LF) or bolts (LFB).

For ultra-high vacuum applications, there are ConFlat (CF) flanges with bolt attachment.

ANSI has a vacuum flange standard called ASA.

The ISO flanges are numbered accoording to the approximate diameter of the tubing to which the flange connects. A KF-40 flange is thus a flange with the KF shape, which goes with a tube of about 40 mm in diameter.

To ensure vacuum tightness, an o-ring (or a copper gasket, in the case of CF flanges) is usually put between the flanges. In the KF flanges, a centering ring keeps the O-ring in position and prevent excessive compression from squeezing the o-ring and degrading the seal.


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