Flanges, fittings and couplings

ISO-KF connection

The ISO-KF connection (according to DIN 28 403 and ISO 2861) enables quick installation and replacement of components in the vacuum system. The system consists of two symmetrical ISO-KF flanges (1), a centering ring with O-ring gasket (2) and a clamping ring (or clamping ring) (3). High-vacuum-tight ISO-KF connections can be mounted without tools simply by placing the clamping ring over the flanges and turning the wing nut. In this way, the clamping ring presses on the conical parts of the flanges which, in turn, clamp the o-ring between the flat surfaces on the inside of the flanges.

Advantages of using the KF system:

  • Fast, safe and reliable
  • No tools needed
  • Can handle pressures down to 10-7 mbar
  • Can withstand pressures up to 2.5 Bar (with internal centering and 3-part
    clamping rings)
  • Easy to disassemble and clean
  • With metal seals, the system can withstand pressure down to 10-9 mbar
  • With metal seals, the system can be baked up to 200 ° C
  • With metal seals, the system is resistant to corrosion
  • With metal seals, the system has a low degassing factor
  • Many opportunities for transitions (between systems)

Size

Unit

A

B

C

D

 Size   

Unit

A

DN 10 KF

mm

30,0

12,2

12,2

45,0

DN 10 KF

mm

30,0

DN 16 KF

mm

30,0

17,2

17,2

45,0

DN 16 KF

mm

30,0

DN 25 KF

mm

40,0

26,2

26,2

55,0

DN 25 KF

mm

40,0

DN 40 KF

mm

55,0

41,2

41,2

71,0

DN 40 KF

mm

55,0

DN 50 KF

mm

75,0

52,4

52,4

91,0

DN 50 KF

mm

75,0

ISO-K connection

Just like the ISO-KF system, ISO-K has an o-ring that seals between the flanges. The system differs mostly in that the dimensions of ISO-K are larger and that it is not based on conical flanges.

However, the function is similar but is available in two versions.

The first one works in such a way that clamp couplings are mounted on the flanges’ heels and hooks in both flanges. the clamp couplings are then tightened with screws (the number is dimension dependent) which then presses the o-ring against the flat flange surfaces.

The second embodiment requires a flange with threaded boreholes on one flange and a bevel bevel on the other. The similarity is that a clutch fitting is mounted on the flange with the lug and then screws in the bolt in the threaded bore of the other flange. This version is called ISO-F.

Benefits of using the ISO-K (/ -F) system:

  • Quick to install
  • Safe and reliable
  • Can be rotated in any orientation
  • Easy to disassemble and clean
  • Withstands pressure down to 10-7 mbar with o-rings (10-9 with metal seals)
  • Easy transitions to other systems
  • Flexible components for vibrating equipment are available

Size

Unit

A

B

C

Number of clamps

D

Screw measure

Number of claws

DN 63 ISO-K

mm

95

70

12

4

110

M8x35

4

DN 100 ISO-K

mm

130

102

12

4

145

M8x35

8

DN 160 ISO-K

mm

180

153

12

4

200

M10x35

8

DN 200 ISO-K

mm

240

213

12

6

260

M10x35

12

DN 250 ISO-K

mm

290

261

12

6

310

M10x35

12

DN 320 ISO-K

mm

370

318

17

8

395

M12x50

12

DN 400 ISO-K

mm

450

400

17

8

480

M12x50

16

DN 500 ISO-K

mm

550

501

17

12

580

M12x50

16

DN 630 ISO-K

mm

690

651

22

12

720

M12x55

20

CF-couplings

CF couplings are generally used in high vacuum and ultra high vacuum. It is not as quick to replace as ISO-K / KF but has other advantages instead. The coupling is very common in various applications within HV and UHV and many times a standard for systems where the leakage has to be minimal.
The sizes available commercially span DN16-DN300. Since the application area is HV and UHV, all parts should be very clean and stored except for the risk of contamination from particles or dirt.

Sealing principle

Between two flanges a metal seal (usually copper) is placed. As the bolts are tightened (crosswise), the knife edge of the flanges cuts into the metal seal and gradually seals the entire coupling joint. The bolts are advantageously pulled with a torque wrench. The torque depends on the bay bolt size used (indirect flange size) between 9 Nm-45Nm (see catalog for more information).

Installation:

Place an OFE copper gasket against the blade edge with clean lint-free gloves. Secure the two flanges with a bolt. The first bolt must ensure that the gasket is stationary and does not move during the remainder of the assembly and support the gasket from falling out of position. With the gasket in place, align all holes in each location, leak test grooves should be in the same place. Then install the bolts into bolts and tighten. Trays are usually used on the nut side of the fastener.

“Anti-seize” floating locking is recommended for attaching all stainless steel hardware. This is especially true with holes or blind holes. Retighten all bolts and nut. The tightening process must be done gradually from a quarter to a half step, in an alternating cross pattern. Continue until the desired torque rating has been reached. In this way, a reliable seal with an even gasket ensures compression and deformation.

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Datavägen 57B, 436 32 Askim, Sverige

Svederusgatan 1, 754 50 Uppsala, Sverige

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