JB/T 1308.5-1999 This standard is a revision of JB 1312-73 "Pg (2500kgf/cm2) concave joint type, size and technical requirements". This standard specifies the type, size and technical requirements of concave joints for ultra-high pressure valves. This standard is applicable to concave joints for neutral media such as ethylene and polyethylene with a nominal pressure of 250MPa. This standard was first published on 2010-03-17. JB/T 1308.5-1999 PN250a concave joint type, size and technical requirements JB/T1308.5-1999 standard download decompression password: www.bzxz.net

1C.S 23.060
Machinery Industry Standard of the People's Republic of China
JB/T1308.1-1308,21-1999
PN250MPa ultrahigh pressure valves and fittingsbzxz.net
Technical conditions
Speclfcations for PN 2S0 MPa ultrahighpressure valves and fittings1999-07-12Promulgated
National Machinery Industry Bureau
2000-01-01Implementation
Machinery Industry Standard of the People's Republic of China
PN250 MPa socket joint
Types, dimensions and technical conditions
Typc, dimcnsions and specificationsof PN 2su MPa socket jolnts
This standard specifies the type, size and mold of the swing head for ultra-high positive valves. JH/T1308.5-1999
This standard is applicable to the second end of the valve with a nominal PN of 250MPa, and the same length of flow [six connections x2 Reference standards
The texts contained in the following standards are constituted as non-standard texts by citing in this standard. When non-standard texts are used, the texts shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest version of the following standardsGR/T 196-:19R1
GB/T 197-:9R1
Basic dimensions of pipe thread (diameter 1-600mm) Tolerances and matching of pipe thread (diameter 1~355mm) GB1804-1992-version Tolerances Small tolerances without specified tolerances JT3/T[308.2-1999PK250MPa valves], pipe fittings and fasteners [5 Technical conditions 3 Structural types and dimensions
3.1 Shaving of joints DN type DN cast net 1 standard crown; DN, DN1, TN: 5 according to Figure 2, the first angle of the operation
National Machine Plate Industry Bureau 199-07-12 approved
2000-01-01 implementation
protection head
3.2 lead hole connector size connection table "standard. Public diameter
technical requirements
account code
3124 x 36H
V3. ×26H
M48×2 6H
8T1309,5—1999
CL8R]4H
The basic dimensions of the thread shall comply with the provisions of GR.T196G, and the tolerances shall be in accordance with the 6H grade accuracy specified in GBT19T. 4.2 The thread surface shall be free of cracks, sink marks and other annual sink marks that affect the strength, and the incomplete first circle of threads shall be removed. 4.3 The machine center tolerance of the machine center shall comply with the provisions of R/8 below: 4.4 The high frequency part shall be removed to prevent biting. 4.5 Other technical requirements shall comply with the provisions of FBT1308.2, 12
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