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Section 1.1<br />
<strong>CF</strong> <strong>Flanges</strong><br />
DN250<strong>CF</strong> 304mm 12” OD<br />
<strong>Flanges</strong> and fittings<br />
<strong>CF</strong> <strong>Flanges</strong><br />
UHV Series<br />
Figure 1<br />
304.0<br />
284.0<br />
28.5<br />
Non-rotatable<br />
Figure 2<br />
304.0<br />
284.0<br />
12.7<br />
28.5<br />
A<br />
B<br />
Rotatable<br />
Features<br />
n<br />
UHV rated to 1x10 -13 mbar<br />
n High-temperature rated to 450°C<br />
n<br />
n<br />
n<br />
n<br />
Rotatable and non-rotatable geometries<br />
OFE copper or optional Viton ® elastomer gaskets<br />
Tapped or clearance bolt holes<br />
There is widespread incompatibility between different<br />
manufacturers’ larger sizes of the <strong>CF</strong> flange –<br />
No DN International Standard notation exists for<br />
<strong>CF</strong> flange sizes 304mm (12”) OD and above.<br />
Figure 3<br />
Figure 4<br />
304.0<br />
284.0<br />
255.4<br />
17<br />
24.6<br />
Specifications<br />
Material<br />
<strong>Flanges</strong><br />
Gaskets<br />
Bolts<br />
Fastening<br />
Bolt type<br />
Nut type<br />
Size<br />
Torque<br />
Vacuum range<br />
304 (1.4301) or 316EFR (1.4429 ESU)<br />
OFE Copper<br />
Stainless steel<br />
Hexagonal<br />
Hexagonal<br />
M8<br />
20 Nm<br />
to below 10 -13 mbar<br />
Temperature range -200°C to 450°C<br />
Weight<br />
Dimensions<br />
Elastomer seal temperature range<br />
Sustained: -20°C to 150°C<br />
Intermittent: 200°C<br />
15.5 kg maximum<br />
305.0 OD x 247.7 ID maximum<br />
n<br />
n<br />
n<br />
304.0<br />
284.0<br />
A<br />
B<br />
255.4<br />
Through hole flanges have 32 bolt holes drilled 8.4 diameter<br />
Tapped flanges have 32 bolt holes threaded M8<br />
Check bolt holes with compatible mating flange<br />
17<br />
12.7<br />
24.6<br />
All dimensions are nominal in millimetres unless specified Weights given are approximate<br />
22<br />
MDC Vacuum Limited Telephone +44 (0)207 192 8300 www.mdcvacuum.co.uk
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