Vacuum Catalogue - Edwards

CF Flange Names There are many descriptions used to describe thesame flange sizes. Use the table below to cross-reference betweencommon names.Flange ODCF Flange Name Equivalentsmm inchDN16CF NW16 CF34 NW16CF 1⅓ inch 34.00 1.33DN25CF NW25CF 2⅛ inch 53.60 2.11DN40CF NW35 CF70 NW35CF 2¾ inch 70.00 2.73DN50CF NW50CF 3¾ inch 85.70 3.37DN63CF NW63 CF114 NW63CF 4½ inch 114.00 4.47DN80CF NW75CF 4⅝ inch 117.35 4.62DN100CF NW100 CF150 NW100CF 6 inch 152.00 5.97DN125CF NW130CF 6¾ inch 171.45 6.75DN160CF NW150 CF200 NW150CF 8 inch 202.00 7.97DN200CF NW200 CF250 NW200CF 10 inch 253.00 9.97DN250CF NW250 CF300 NW250CF 12 inch 306.00 13.25NW Polymer Clamping RingsIn addition to the traditional aluminium hinged clamp, Edwards alsooffers a range of coupling clamps manufactured from high technologypolymer, offering important advantages for the vacuum systembuilder.Compared to aluminium, the high flexural modulus and betterstrength-to-weight ratio has enabled Edwards to design andmanufacture clamps which are lighter and more compact thanexisting aluminium products. The CX4 crystalline aryl polymer clampscan be used at temperatures up to 100 °C and are unaffected by mostcommon solvents.These clamps are competitively priced and the high quality finish willenhance the appearance of any vacuum system. The range isavailable in swing and quick release hinged versions covering thefollowing flange sizes: NW10/16, 20/25, 25/32, 32/40 and 50. WithEdwards Co-Seals, swing clamps are suitable for use in the pressurerange 10 -7 mbar to 10 bar. Electrical continuity across the clamps isachieved by built-in earth strips.Co-SealThe introduction of our Co-Seal represented a major advance in themethod of sealing NW and ISO flange connections. Discerning usersappreciate the benefits of a seal design which eliminates crevices andtrapped volumes. Our NW Co-Seals with polymer carriers offer amore economical seal with even wider appeal.A Co-Seal has a split outer ring, or carrier, which retains a mouldedelastomer sealing ring. When fitted, the inner face of the Co-Seal isdirectly exposed to the vacuum system, eliminating any crevices ortrapped volumes which can generate gas bursts and inhibit pumpdown.Unlike the regular centring-ring and O-ring, the NW Co-Seal isfully restrained externally and is therefore suitable from 10 -7 mbar to10 bar. Available with either nitrile or fluoroelastomer seals.For ISO bolted flanges, cut-outs around the external circumference ofthe Co-Seal are positioned so that the securing bolts centralise theCo-Seal precisely. For ISO collar flanges, claw clamps also centralisethe seal and are themselves spaced around the flange by the cut-outsin the Co-Seal.Centring Rings in High Technology PolymerWe complement our aluminium centring-rings with a rangemanufactured from a high-tech polymer. These centring-rings have aunique slotted design which prevents gas bursts. The CX2 polymercan be used at temperatures up to 100 °C and is unaffected by mostcommon solvents. The material has an outgassing rate of6.6 × 10 -8 mbar l s -1 cm -2 which makes it suitable for use in mostvacuum systems, whilst giving additional benefits in terms of lowerweight and cost.Technical DataPhysical DataOperating pressure range (absolute)C clamp and centring-ring 10 -7 mbar – 1 bar /14.5 psiStainless steel clamping ring andCo-Seal10 -7 mbar – 10 bar /145 psiStainless steel clamp and metal seal 10 -8 mbar – 3 bar /44 psiStainless steel clamp and Co-Seal (all 10 -7 mbar – 10 bar /sizes)145 psiPolymer and aluminium clamps and Co-SealNW10 to NW25 10 -7 mbar – 10 bar /145 psiNW40 to NW50 10 -7 mbar – 10 bar /145 psiNW trapped O-ring 10 -7 mbar – 10 bar /145 psiISO trapped O-ring 10 -7 mbar – 1 bar /14.5 psiO-ring and centring-ring (vacuum use only) 10 -7 mbar – 1 bar /14.5 psiBellows 10 -7 mbar – 1 bar /14.5 psiFlexible pipelines 1 10 -7 mbar – 1.5 bar /21 psiBraided flexible pipelines 1 10 -7 mbar – 10 bar /145 psi1 Depends on sizeOperating TemperatureThe maximum temperature for continuous operation with fluoroelastomer is 150 °C. Itmay be intermittently baked to 200 °C.Polymer Co-Seal -10 to 80 °CAluminium Co-Seal and nitrile seal -10 to 100 °CAluminium Co-Seal and fluoroelastomer -10 to 200 °CsealPolymer centring-ring and nitrile O-ring -10 to 100 °CPolymer centring-ring and-10 to 125 °Cfluoroelastomer sealNitrile O-ring -10 to 100 °CFluoroelastomer O-ring -10 to 200 °CPolymer clampConstant vacuum use -10 to 100 °CIntermittent vacuum use -10 to 125 °CStainless steel clamping ring -10 to 125 °CAluminium swing/hinge clamp -10 to 200 °CStainless steel clamp -10 to 200 °CStandards complianceNW and ISO fittings Pneurop 6606 (1981),ISO1609 (1986)DIN28403, DIN28404CF fittingsISO3669Stainless steel equivalents6Page207Shop online at www.edwardsvacuum.com