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ISO/PRF 3669

Vacuum technology — Dimensions of knife-edge flanges

General information

50.20     Apr 22, 2026

ISO

ISO/TC 112

International Standard

23.160  

Scope

This document specifies the dimensions of fixed or rotatable bolted knife-edge flanges used in vacuum systems for pressures ranging from atmospheric to as low as 10−11 Pa.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 3669:2020

NOW

PROJECT
ISO/PRF 3669
50.20 Proof sent to secretariat or FDIS ballot initiated: 8 weeks
Apr 22, 2026

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