Trinos Vacuum Systems has developed the 316 MaxVac SS Material for the use in high-end UHV applications such as in the CERN, Diamond, DESY or Bessy accelerators. This material is manufactured exclusively for Trinos Vacuum Systems. 316 MaxVac starts as 316LN SS. Then, after the initial melting process, the steel is treated in an electric furnace under vacuum to greatly reduce the natural inclusions and impurities otherwise found in standard steels. This cleaner steel will allow for an improved vacuum performance and an improved degassing rate. The 316 MaxVac has extremely low magnetic permeability. With an index of 1.002, it truly qualifies as a non-magnetic stainless steel. For even greater strength and purity, 316 MaxVac can also be forged. The result is a truly amazing steel. This material is CERN certified. While this material is also available for UHV chambers, it is available in any size CF flange. For these reasons, Trinos Vacuum Systems only uses high Quality Steels. 304L SS is our standard grade of steel for chambers and components. 316 LN SS and 316 MaxVac SS are availabe upon request for any chamber or components. All components contain vacuum suitable welds that have been created from inside the component. If the geometry is too complex to attain a suitable internal weld, the component is welded completely through in order to avoid virtual leaks like cleavs or blind holes. Combined with a professional surface treatment and specialized cleaning process a very low desorption is assured. All welds are helium leak tested to ensure < 10-10mbarxl/s leak rates are achieved. Our UHV components are manufactured following ISO 3669 and Penurop 6606 in standard sizes of DN16 to DN 350. Larger sizes or non-standard items are available upon request. The CF (ConFlat) connection for UHV uses flange profiles with cutting edges in combination with a metal seal (most common: OFHC Copper). While assembling the cutting edge is pressed in the metal seal, who yields. This cold yielding is limited by the external wall to the layer for the metal surface. That causes very high pressures in the barrier. Under high pressure the sealing material starts to yield malleably and adjusts surface defect, a metallic UHV suitable connection is produced. |
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As a standard for metal seals, Oxygen Free High Conductivity (OFHC) copper is used. It can tolerate multiple bakings up to 450°C/ 840°F - especially for large diameters - baking and cooling down does not occur too quickly. To avoid oxidation of the copper at normal atmosphere, copper gaskets are also available with silver-plated. During set up and testing of the system, Viton seals can be used.
Viton seals are less expensive due to their ability to be reused but are limited by their tolerance to
high temperatures and their leakrate.
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Connecting a CF Fitting or Flange When making a CF connection it is important to fasten the screws on a CF connection opposite each other. Fasten one screw and then the next screw fastened should be offset 180°. The next screw should be approximately 90° off and then 180° and so on. This will prevent any unnecessary tension. A radial keyway on the face of the flange serves to break any unwanted sealing connection that will interfere with the testing at higher vacuum ranges and will also permit the helium to be diffused directly on the sealing surface. When connecting two CF Flanges are being connected. It is helpful to have at least one flange rotatable in order to align the bolt holes for fastening. |
| Nominal diameter US [inch/OD] | 1 1/3" |
2 1/8" |
2 3/4" |
2 3/4" |
3 3/8" |
4 1/2" |
4 5/8" |
6" | 6 3/4" |
8" | 10" | 12" | 14" | 16 1/2" |
| Nominal diameter DN [mm/ID] | 16 CF |
25 CF |
38 CF |
40 CF |
50 CF |
63 CF |
80 CF |
100 CF |
130 CF |
160 CF |
200 CF |
250 CF |
300 CF |
350 CF |
| Inner diameter I [mm] |
16 | 22.2 | 35 | 38 | 47.6 | 63 | 73 | 100 | 123.7 | 150 | 200 | 250 | 298.5 | 349.3 |
| Outer diameter A [mm] |
34.0 | 54.1 | 69.9 | 69.9 | 85.9 | 113.5 | 117.6 | 152.0 | 171.5 | 202.5 | 253.0 | 306.0 | 355.6 | 419.1 |
| Height H [mm] | 7.2 | 12.6 | 13 | 13 | 17.5 | 17.5 | 20.6 | 20 | 21.4 | 22 | 24.5 | 26 | 28.5 | 28.5 |
| flange socket R [mm] | 18.2 | 41.3 | 38.2 | 40 | 51 | 70.3 | 76.5 | 108.3 | 127.3 | 159.3 | 205.3 | 256.3 | 305.3 | 356.1 |
| Pipe diameter R [mm] |
18 x 1 | 25.4 x | 38 x 1.5 | 40 x 1.5 | 50.8 x | 70 x 2 | 76.2 x | 108 x 2 | 127 x | 159 x 2 | 205 x 2.5 | 256 x 3 | 305 x 3 | 356 x 3 |
| Bolt circle L [mm] | 27 | 41.3 | 58.7 | 58.7 | 72.4 | 92.15 | 102.4 | 130.25 | 151.6 | 181.0 | 231.8 | 284.0 | 325.4 | 388.9 |
| Screw/thread (metric) |
6 x M4 | 4 x M6 | 6 x M6 | 6 x M6 | 8 x M8 | 8 x M8 | 10 x M8 | 16 x M8 | 18 x M8 | 20 x M8 | 24 x M8 | 32 x M8 | 30 x M8 | 36 x M8 |
| Screw/thread (US) |
6 x 8-32 | 4 x 1/4-28 | 6 x 1/4-28 | 6 x 1/4-28 | 8 x 5/16-24 | 8 x 5/16-24 | 10 x 5/16-24 | 16 x 5/16-24 | 18 x 5/16-24 | 20 x 5/16-24 | 24 x 5/16-24 | 32 x 5/16-24 | 30 x 5/16-24 | 36 x 5/16-24 |
All components are regrouped in the left-hand menu.
