| Customization: | Available |
|---|---|
| Standard: | ANSI, DIN, GB, JIS, GOST |
| Type: | Welding Flange |
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The CF flange (originally called ConFlat) is a sexless design where both flanges are identical. Typical flange materials are austenitic stainless steel types 304L, 316L, 316LN, and surface hardened aluminum (made from a weldable Al alloy). The seal mechanism is a knife-edge that is machined below the flange's flat surface. As the bolts of a flange-pair are tightened, the knife-edges make annular grooves on each side of a soft metal gasket. The extruded metal fills all the machining marks and surface defects in the flange, yielding a leak-tight seal (Figure 1). The CF seal operates from 760 Torr (1013 mbar) to < 1 x 10-13 Torr (<1.3 x 10-13 mbar), and within the temperature range -196° C to 450° C (depending on material). Flange sizes in North America (NA) are determined by outside diameter (O.D.). However, in Europe and much of Asia (E/A), the nominal internal diameter (nominal I.D.) of the largest tube that can be welded to a bored flange is usually referenced in their nomenclature.
The NA sizes are: 11/3" ("mini"), 23/4", 41/2", 6", 8", 10", 12", 131/4", 14" and 161/2" O.D.. The E/A sizes are digits (representing the nominal bore in mm) prefixed with either DN or NW (depending on manufacturer): DN16, DN40, DN63, DN100, DN160, DN200, and DN250. In addition, the NA system has intermediate O.D. sizes to enable the use of "standard" inch dimension tubes. They are 21/8" (1" diameter
tube), 33/8" (2"), 45/8" (3"), 63/4" (5"). For other dimensions, see the ordering tables on this site.
CF flanges (with identical O.D.s up to 10" inclusive) from different (reputable) manufacturers will almost certainly seal.
The vacuum equipment industry adheres to the de-facto ConFlat standard.
ConFlat flanges are offered in four versions:
Both Fixed and Rotatable flanges are available with your choice of clearance-holes or tapped holes.
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