The ISO-K (clamped) and ISO-F (bolted) flange families, covering nominal sizes from DN63 up to several hundred millimetres, used where KF is too small and an elastomer seal is acceptable. A centring ring carrying an O-ring sits between plain flange faces, often supported by an outer ring. They are the usual mount for turbo pumps, cryopumps and gate valves on production tools.
New turbo has an ISO 160 flange on the inlet, so we need claw clamps and a centering ring with an outer ring.
Also heard as
- ISO-K
- ISO-F
- ISO-LF
- LF flange
Related terms
KF flange
Quick-release clamp flange with a centring ring and O-ring, the standard small fitting for rough and high vacuum.
O-ring
Elastomer ring with a round cross-section that seals demountable vacuum joints by being squeezed into place.
Turbomolecular pump
High vacuum pump whose rotor blades spin at tens of thousands of rpm and bat molecules toward the exhaust.
Gate valve
Full-bore valve with a sliding plate that isolates a high vacuum pump or a load lock from the chamber.