JB/T 1308.19-1999 This standard is a revision of JB 1326-73 "Pg (2500kgf/cm2) equal tee, equal cross type, size and technical requirements". This standard specifies the equal tee, equal cross type, size and technical requirements for ultra-high pressure valves. This standard is applicable to equal tee, equal cross for neutral media such as ethylene and polyethylene with a nominal pressure of 250MPa. This standard was first published on 2011-03-17. JB/T 1308.19-1999 PN250a equal tee, equal cross type, size and technical requirements JB/T1308.19-1999 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 conditionsWww.bzxZ.net
Specifications for PN250MPa ultrahigh pressure valves and fittings
Published on July 12, 1999
National Bureau of Machinery Industry
Implementation on January 1, 2000
Machinery Industry Standard of the People's Republic of China
PN250MPa equal diameter three-way and equal diameter four-way
Type, dimensions and specifications of equaldimameter threeway and equaldiameter fourwayPN250MPavalves1Scope
JB/T1308.19-1999
Replaces JB1326-73
This standard specifies the types, dimensions and technical requirements of equal-diameter tees and equal-diameter four-way valves for ultra-high pressure valves. This standard is applicable to equal-diameter tees and equal-diameter four-way valves for neutral media such as ethylene and polyethylene with a nominal pressure of PN250MPa. 2Referenced 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. GB/T1804-1992-General tolerances for linear dimensions without tolerances JB/T1308.2-1999 PN250MPa Technical conditions for valves, pipe fittings and fasteners JB/T1308.4-1999 PN250MPa Types, dimensions and technical conditions for neck joints 3 Structural types and dimensions
The type of equal-diameter tees connected by pipe joints shall be in accordance with the provisions of Figure 1, and the type of equal-diameter crosses shall be in accordance with the provisions of Figure 2. 25
Retained by the State Machinery Industry Bureau on July 12, 1999 40
2000-01-01 implementation
JB/T1308.19-1999
The dimensions of equal-diameter tees and equal-diameter crosses connected by pipe joints shall be in accordance with the provisions of Table 1. 3.2
Nominal diameter
Thread code
M20×1.52
M24×22
M33 ×22
M48 x22
Sharp angle
Equal tee
Equal cross
JB/T1308.19-1999
3.3The type of equal tee connected by flange shall be in accordance with the provisions of Figure 3, and the type of equal cross shall be in accordance with the provisions of Figure 4. S×SxS
Short angle
3.4The dimensions of equal tee and equal cross connected by flange shall be in accordance with the provisions of Table 2. 42
Nominal diameter
4 Technical requirements
JB/T1308.19-1999
Material of equal-diameter tee and equal-diameter cross is 33CrNi3MoA. 4.1
Mechanical properties after heat treatment shall be in accordance with the provisions of Table 3. 4.2
Material grade
33CrNi3MoA
Tensile strength. ,
≥882
Special service point.
≥735
Elongation ratio 8,
Shrinkage ratio
The end face of the pipe joint connecting the equal-diameter tee and equal-diameter cross shall be in accordance with the provisions of JB/T1308.4. 4.3
The intersection of the equal-diameter tee and the equal-diameter cross shall be adjusted and burrs shall be removed. 4.4
4 ×M242
4 × M272
6 × M27_2
Impact value A
Maximum weight kg
Equal diameter one-way and equal diameter four-way
269 ~321
4.5The deviation of the non-intersection degree of the mutually perpendicular thread center lines of equal diameter two-way and equal diameter four-way connected by pipe joints and the deviation of the non-intersection degree of the mutually perpendicular inner hole center lines of equal diameter three-way and equal diameter four-way connected by flanges shall be ≤0.5mm. 4.6The deviation of the non-perpendicularity of the mutually perpendicular thread center lines of equal diameter three-way and equal diameter four-way connected by pipe joints and the deviation of the non-perpendicularity of the inner hole center lines of equal diameter three-way and equal diameter four-way connected by flanges shall be ≤0.3mm within a length of 100mm. 4.7The deviation of the non-coaxiality of the end thread center lines of equal diameter three-way and equal diameter four-way connected by pipe joints shall be ≤0.15mm. 4.8 The bolt hole distribution and center line of the two vertical surfaces of the flange-connected equal-diameter tees and equal-diameter crosses: the four bolt holes are staggered by 45°; the six bolt holes are staggered by 30°
4.9 The tolerance of the machining dimensions not specified shall comply with GB/T1804. Measures shall be taken to prevent biting of the threaded part. 4.109
Equal-diameter tees and equal-diameter crosses shall be chemically treated to prevent atmospheric corrosion. 4.11
Equal-diameter tees and equal-diameter crosses shall be stamped with a steel stamp on the side of the square body, and the stamp content shall be: JB/T1308.19 specification/batch number. 4.12
The ultrasonic flaw detection, magnetic particle flaw detection and other technical requirements of equal-diameter tees and equal-diameter crosses shall comply with the provisions of JB/T1308.2. 4.13
5 Marking examples
5.1 Equal-diameter tees and equal-diameter crosses connected to pipe joints with a nominal diameter of 3 mm: equal-diameter = G-DN3JB/T1308.19-1999, equal-diameter cross G-DN3JB/T1308.1919995.2 Equal-diameter tees and equal-diameter crosses connected to flanges with a nominal diameter of 3 mm: equal-diameter tees F-DN3JB/T1308.19—1999, equal-diameter crosses F-DN3JB/T1308.19—199943
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