JB/T 1308.20-2011PN2500 ultra-high pressure valves and fittings - Part 20: Reducing tees and reducing crosses (English PDF)

1 Foreword

JB/T 1308.20-2011 was issued by MIIT on 18 May 2011 and has been in force since 1 August 2011.

It replaces the earlier edition JB/T 1308.20-1999.

It is one of 45 parts of the JB/T 1308 series.

2 Scope

This standard is the part of the Chinese machinery industry standard on PN2500 ultra-high pressure valves and fittings that deals with reducing tees and reducing crosses. The recommended part gives their forms, their dimensions and the technical requirements they must satisfy. It is written for fittings of nominal pressure PN2500 and nominal sizes from DN3 to DN25, used on forged steel valves whose medium is ethylene, polyethylene or another non-corrosive fluid. It quotes JB/T 1308.19. The edition it replaces is JB/T 1308.20-1999. Its Chinese classification number is J16 and its international classification number 23.060.01.

3 Normative references

JB/T 1308.20-2011 cites the following standards, which apply in full or in part through the references made to them in its clauses.

JB/T 1308.19

4 About this standard

Issued by: MIIT

English translation: about 15 pages

5 Related standards

Other parts of this standard:

JB/T 1308.1-1999 — PN 250 MPa valves - Types and basic parameters

JB/T 1308.1-2011 — Part 1: Valve types and basic parameters

JB/T 1308.1-2025 — PN2500 Ultra-high pressure valve and fitting - Part 1: Valve type and basic parameter

JB/T 1308.2-1999 — PN 250 MPa valves, fittings and fasteners - Technical specifications

JB/T 1308.2-2011 — Part 2: Valves, fittings and fasteners

JB/T 1308.2-2025 — PN2500 Ultra-high pressure valve and fitting - Part 2: Technical specification

JB/T 1308.3-1999 — PN 250 MPa pipe ends - Types, dimensions and specifications

JB/T 1308.3-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 3: Pipe ends

JB/T 1308.3-2026 — PN2500 ultrahigh pressure valves and fittings - Part 3: Flange, fasteners and connections

JB/T 1308.4-1999 — PN 250 MPa necked joints - Types, dimensions and specifications

JB/T 1308.4-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 4: Necked joints

JB/T 1308.4-2026 — PN2500 ultrahigh pressure valves and fittings - Part 4: reduced pipe

JB/T 1308.5-1999 — PN 250 MPa socket joints - Types, dimensions and specifications

JB/T 1308.5-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 5: Socket joints

JB/T 1308.6-1999 — PN 250 MPa cone gaskets and cone blind gaskets - Types, dimensions and specifications

JB/T 1308.6-2011 — Part 6: Conical gaskets and conical blind gaskets

JB/T 1308.7-1999 — PN 250 MPa threaded collars - Types, dimensions and specifications

JB/T 1308.7-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 7: Threaded collars

JB/T 1308.8-1999 — PN 250 MPa inner and outer nuts - Types, dimensions and specifications

JB/T 1308.8-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 8: Inner and outer nuts

JB/T 1308.9-1999 — PN 250 MPa joint nuts - Types, dimensions and specifications

JB/T 1308.9-2011 — Part 9: Union nuts

JB/T 1308.10-1999 — PN 250 MPa outer nuts - Types, dimensions and specifications

JB/T 1308.10-2011 — Part 10: Outer nuts

JB/T 1308.11-1999 — PN 250 MPa inner and outer threaded collars - Types, dimensions and specifications

JB/T 1308.11-2011 — Part 11: Male-female threaded collars

JB/T 1308.12-1999 — PN 250 MPa positioning rings - Types, dimensions and specifications

JB/T 1308.12-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 12: Positioning rings

JB/T 1308.13-1999 — PN 250 MPa flanges - Types, dimensions and specifications

JB/T 1308.13-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 13: Flanges

JB/T 1308.14-1999 — PN 250 MPa stud bolts - Types, dimensions and specifications

JB/T 1308.14-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 14: Stud bolts

JB/T 1308.15-1999 — PN 250 MPa stepped stud bolts - Types, dimensions and specifications

JB/T 1308.15-2011 — Part 15: Stepped stud bolts

JB/T 1308.16-1999 — PN 250 MPa nuts - Types, dimensions and specifications

JB/T 1308.16-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 16: Nuts

JB/T 1308.17-1999 — PN 250 MPa reducing pipes - Types, dimensions and specifications

JB/T 1308.17-2011 — Part 17: Reducers

JB/T 1308.18-1999 — PN 250 MPa reducing joints - Types, dimensions and specifications

JB/T 1308.18-2011 — Part 18: Reducing joints

JB/T 1308.19-1999 — PN 250 MPa equal tees and equal crosses - Types, dimensions and specifications

JB/T 1308.19-2011 — Part 19: Equal tees and equal crosses

JB/T 1308.21-1999 — PN 250 MPa elbows - Types, dimensions and specifications

JB/T 1308.21-2011 — PN 2500 ultrahigh pressure valves and fittings - Part 21: Elbows

Other editions:

JB/T 1308.20-1999 (earlier edition)

6 Classification and status

International classification (ICS): 23.060.01

Prefix JB/T: recommended standard.