JB/T 1308.20-1999 This standard is a revision of JB 1327-73 "Pg (2500kgf/cm2) reducing tees and reducing crosses, types, dimensions and technical requirements". This standard specifies the types, dimensions and technical requirements of reducing tees and reducing crosses for ultra-high pressure valves. This standard is applicable to reducing tees and reducing crosses for neutral media such as ethylene and polyethylene with a nominal pressure of 250MPa. This standard was first published on 2011-03-08. JB/T 1308.20-1999 PN250a reducing tees and reducing crosses types, dimensions and technical requirements JB/T1308.20-1999 standard download decompression password: www.bzxz.net

ICS23.060
Machinery Industry Standard of the People's Republic of China
JB/T1308.1~1308.21-1999
PN250MPa ultrahigh pressure valves and fittings
Technical conditions
Specifications for PN250MPa ultrahigh pressure valves and fittings
1999-07-12 Issued
National Machinery Industry Bureau
2000-01-01 Implementation
1 Scope
Machinery Industry Standard of the People's Republic of China
PN250MPa Reducing Tee, Reducing Cross
Type, dimensions and specifications of reduced three-wayandreducedfour-wayPN250MPavalvesJB/T1308.20-1999
ReplacesIB1327-73
This standard specifies the types, dimensions and technical requirements of reducing tees and reducing four-way for ultra-high pressure valves. This standard is applicable to reducing tees and reducing four-way for neutral media such as ethylene and polyethylene with a nominal pressure of PN250MPa. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. JB/T1308.19—1999PN250MPaType, size and technical conditions of equal-diameter tees and equal-diameter crosses 3 Structural types and sizes
3.1 The type of reducing tees connected by pipe joints shall comply with the provisions of Figure 1, and the type of reducing crosses shall comply with the provisions of Figure 2. Sx
Maintenance tips
Approved by the State Machinery Industry Bureau on July 12, 1999 44
Screen tip protection
2000-01-01 implementation
JB/T1308.20-1999
Record angles
3.2 The sizes of reducing tees and reducing crosses connected by pipe joints shall comply with the provisions of Table 1. Table 1
Nominal diameter
10 × 6
15 × 6
15×10
Nominal diameter
15 x 10
Thread code
M24 × 22
M33 × 22
M48 x22
Thread code
M20 × 1.52
M24 × 2-2
M33 × 22
Operation category
Other V
The type of reducing tee with flange connection shall be as specified in Figure 3, and the type of reducing cross shall be as specified in Figure 4. 3.3
Reducing cross
JB/T 1308.20—1999
Maintain solid color
Maintain fish
6/151—Month
JB/T1308.20—1999
The dimensions of the reducing tee and reducing cross connected by these methods shall be in accordance with the provisions of Table 2.
Nominal diameter
20×15
25×15Www.bzxZ.net
25×20
Nominal diameter
20×15
25×15
25×20
4 Technical requirements
The technical requirements shall be in accordance with the provisions of JB/T1308.19. 5 Marking example
Reducing tees and reducing crosses connected to pipe fittings with a nominal diameter of 10×6 mm: 5.1
4 × M242
4 × M272
4 ×M272
6 × M27-2
Weight kg
Reducing 2-way
Reducing 4-way
Reducing = through G-DN10×6JB/T1308.20—1999, Reducing 4-way G-DN10×6JB/T1308:20—19995.2 Reducing tee and reducing 4-way with 3mm nominal diameter connected by cover: Reducing = through F-DN3JB/T1308.20—1999, Reducing 4-way F-DN3JB/T1308.20—199947
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