Vacuum Technology — Mounting Dimensions of Pipeline Fittings — Part 2: Knife-edge Flange Type
1 Scope
This part of GB/T 16709 specifies mounting dimensions for vacuum pipeline fittings (elbows, tees and crosses) of knife-edge flanges for nominal bores from 16 mm to 200 mm.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 16709. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this part. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
ISO 3669 Vacuum Technology — Bakable Flanges — Dimensions
3 Terms and Definitions
For the purposes of this part, the terms and definitions given in ISO 3669 apply.
4 Requirements
4.1 Mounting dimensions of the vacuum pipeline fittings shall be as specified in Table 1. See Figures 1 to 3.
4.2 Flange dimensions shall be as specified in ISO 3669. One or more flange should be rotatable.
4.3 Bolt holes in the flanges specified in ISO 3669 shall be positioned as shown in Figure 4. Angle α is a function of the number of bolt holes.
Foreword II 1 Scope 2 Normative References 3 Terms and Definitions 4 Requirements Bibliography