Flange connections ISO-KF Clamp Claw Centering ring Blank-off flange Weld neck flange Metal seal (indium, max. 60°C) Soft-start throttle Suitable flange material Leak rate for helium (mbar ls-1) Sealing force (N per cm sealing line) A: aluminum E: stainless steel Maximum values: depending on operating conditions and sealing materials

Series 31 Clamp for seal made of FKM (VITON) and indium DN mm inch Ordering numbers clamp: aluminim screws: nickel-plated steel Claw with screw and washer DN mm inch Ordering numbers claw: aluminum screw, washer: stainless steel Centering ring with O-ring made of FKM (VITON) DN Ordering numbers Ordering numbers stainless steel

Flange connections ISO-KF stainless steel *) minimum dimension Weld-neck flange short or long DN stainless steel Metal seal indium DN mm inch inner ring: stainless steel outer ring: aluminum Max. temperature 60°C, multiple use with VAT clamps

Soft-start throttle valve Series 31 from chamber throttle flaps For reduction of turbulence in pump forelines during pumpdown Protection device against When mounting them between two ISO-KF flanges (instead of a centering ring), the open flaps must be orientated against the air flow in the vacuum line. When the roughing system goes into operation, a strong air flow occurs in the forevacuum line, which immediately closes the valve and reduces the pipe section by about 99%. When reaching a differential pressure of approx. 15 mbar, the valve opens abruptly and leaves the pipe section nearly unobstructed...