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• Fast availability from responsive local supply centers
• BOC Edwards worldwide support
• International ISO, Pneurop and British Standards
• Complete range for all common sizes in aluminum and stainless steel
• Stainless fittings made in 316L for highest corrosion resistance
• Precision material control ensures low outgassing and dependable vacuum performance |
When you buy flange fittings from BOC Edwards, you can expect the service that only a leading international supplier can offer you. Whether you are an OEM (needing scheduled deliveries of component kits for series production) or a unique system builder, you can rely on your local supplier to meet all your requirements. |
NW Fittings (PDF Página 7)
NW polymer clamping rings |
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In addition to the traditional aluminum hinged clamp, BOC Edwards also offers a range of coupling clamps manufactured from high technology polymer, offering important advantages for the vacuum system builder. Compared to aluminum, the high flexural modulus and better strength-toweight ratio has enabled BOC Edwards to design and manufacture clamps which are lighter and more compact than existing aluminum products. The CX4 crystalline aryl polymer clamps can be used at temperatures up to 120 °C and are unaffected by most common solvents. These clamps are competitively priced and the high quality finish will enhance the appearance of any vacuum system. The range is available in swing and quick release hinged versions covering the following flange sizes: NW10/16, 20/25, 25/32, 32/40 and 50. With BOC Edwards Co-Seals, swing clamps are suitable for use in the pressure range 17 bar to 10-7 mbar. Electrical continuity across the clamps is achieved by built-in earth strips.
Centering rings in high technology polymer
We complement our aluminum centering rings with a range manufactured from a high-tech polymer. These centering rings have a unique slotted design which prevents gas bursts. The CX2 polymer can be used at temperatures up to 120 °C and is unaffected by most common solvents. The material has an outgassing rate of 6.6 × 10-8 mbar l s 1cm-2 which makes it suitable for use in most vacuum systems, whilst giving additional benefits in terms of lower weight and cost. |
Co-Seal
The introduction of our Co-Seal represented a major advance in the method of sealing NW and ISO flange connections. Discerning users appreciate the benefits of a seal design which eliminates crevices andtrapped volumes. Our NW Co-Seals with polymer carriers offer a more economical seal with even wider appeal.
A Co-Seal has a split outer ring, or carrier, which retains a moulded elastomer sealing ring. When fitted, the inner face of the Co-Seal is directly exposed to the vacuum system, eliminating any crevices or trapped volumes which can generate gas bursts and inhibit pump-down. Unlike the regular centering ring and ‘O’ ring, the NW Co-Seal is fully restrained externally and is therefore suitable from 10-8 mbar to 17 bar. Available with either nitrile or fluoroelastomer seals.
For ISO bolted flanges, cut-outs around the external circumference of the Co-Seal are positioned so that the securing bolts centralize the Co-Seal precisely. For ISO collar flanges, claw clamps also centralize the seal and are themselves spaced around the flange by the cut-outs in the Co-Seal. |
ISO fittings (PDF Página 18)
CF flange fittings (PDF Página 25)
ASA FLANGE FITTINGS |
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BOC Edwards offers a full range of ASA flanges and fittings. The ASA series includes a complete range of components compatible with other ASA manufactured flanges and fitting, which are also compatible with 150# ANSI flanges.
Sealing principle
Typical vacuum applications would require one flat face flange and one ‘O’ ring grooved flange. The two would mate together creating a seal for pressures down to 1 x 10-7 Torr. Other means of sealing may be two ‘O’ ring grooved flanges mated together with a ring of thin metal shim-stock used to separate the two flanges. If both flanges are flat face, the use for a flat rubber gasket or ‘O’ rings molded into carriers are used between the two flanges to create a seal. All three methods are acceptable when used for vacuum, although the most common method is the use of one flat face and one ‘O’ ring grooved flange mated together. |
Dimensions
ASA flanges are available in rotatable and non rotatable flange sizes of 1” to 10”. The ASA size represents the OD of the tube size used on a particular flange. However, because of the requirement for a different size tube but with the same OD, all ASA flanges will have several options for different tube OD’s. For instance, a 4” flange has an OD of 9” and can accept tube OD’s of 4” and 6” and a 6” flange has an OD of 11” and can accept tube OD’s of 6” and 8”. It is important to gather all necessary information when determining which flange is required. Standard bore sizes of ASA flanges will accept tubing only, which has a larger OD than pipe. If pipe is being used with the ASA flange, it will be necessary to use a blank flange and have the required bore size machined to the pipe OD. |
