Flange: 304 or 316L stainless steelO-rings: Viton, Buna & silicone
Tube finishes: Beadblast standard (Tumbled & electropolish available)
Wing nut, SureSeal,bulkhead & chain clamps
Elastomer seal: >1 x 10-8 mbar -High vacuumMetal seal: >1 x 10-11- mbar - UHV
Viton: -20ºC to 200ºCSilicone: -50º to 230ºCBuna: -30ºC to 110ºC Metal seal: -270˚C to 150˚C
All dimensions are in inches (mm) & weights are in pounds (kg), unless otherwise noted.
Nor-Cal NW flanges are designed to ISO 2861 specifications for standard USA tube sizes from 3/8 to 2 inches (9.53 to 50.8mm) OD. They are compatible with other manufacturers’ ISO-KF style flanges. NW flanges utilize an aluminum clamp with a single wing nut fastener or a lock-over-center clamp allowing frequent disassembly without tools. The vacuum seal is effected by the application of uniform pressure from the clamp on the 15º surface of the 304 stainless steel flanges.
The mating flange surfaces compress a Viton O-ring held in place by a centering ring. The resultant seal can be used in vacuum applications of up to 10-8 mbar and baked to 200ºC, however sustained baking above 150ºC may result in deterioration of O-rings. Additionally, NW flanges allow components to be rotated before assembly for ease of component alignment. NW flanges are available on virtually all Nor-Cal components and fittings.
Nor-Cal manufactures a full line of NW adapters so you can add to or build an entire system with NW components. NW flanges can also be used with chain clamps and aluminum seals to obtain a UHV seal bakeable to 150ºC.
Trapped Centering Rings
Nor-Cal trapped centering rings for NW flanges feature easy assembly with exact centering and are appropriate for vacuum or pressure by externally supporting the sealing ring. Trapped O-rings are intended for use where pressures range from rough vacuum to above atmosphere. Applications include vacuum pump exhaust lines and abatement tools.