Edwards® NW and ISO flange fittings
Choose
the optimum material to match your application and budget AIuminum is
ideal for achieving dependable cost-effective performance down to 10
(-7) bar. Edwards® (formerly BOC Edwards®) also offers 3I6L/DIN 1.4404 stainless steel
fittings for rugged corrosion resistance in semiconductor
processing and excellent repeatability in high vacuum applications.
In addition, careful quality control of elastomer specifications
ensures critical sealing materials deliver the low outgassing
performance your vacuum system performance depends on. Edwards®
attention to detail on all specifications delivers fit-and-forget
dependability for your vacuum equipment. Edwards® UHV
ConFlat (R) flange fittings
Sealing
principle A copper seal is squeezed axially and radially between two
CF flanges, where knife-edges force the copper to cold flow. This
flow is severely limited by the vertical flange wall which generates
high pressures and fills surface imperfections to give a leak tight
joint At high bake- out temperatures, the flange geometry maintains
high internal pressures despite softening of the gasket. A radial
groove extends right up to the sealing ring and provides for leak
testing of the vacuum connection. Edwards® Materials
Our
range of CF flanges are manufactured from AISI 304 stainless steel,
which offers optimum performance at an affordable cost. Stainless
steel 304 is used for the majority of UHV applications where a
takeout temperature of up to 450 degrees C is needed. AISI 316LN
stainless steel is recommended for special applications where a
harder material, higher bake- out temperature and much lower magnetic
permeability are needed: these fittings are available on special
order terms. Edwards® Dimensions
Edwards® CF flanges are manufactured to international standards and
are compatible with all leading manufacturers. Metric flanges common
in Europe and Asia use metric tapped holes and bored holes in flanges
suitable for metric tubing. Flanges specified in inches, more
commonly used in the USA, use UNF tapped flange threads and bored
holes compatible with inch sided tube. Edwards® offers both
options.
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