JB/T 1308.17-1999 This standard is a revision of JB 1324-73 "Pg (2500kgf/cm2) reducer type, size and technical requirements". This standard specifies the type, size and technical requirements of reducers for ultra-high pressure valves. This standard is applicable to reducers 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 1308.17-1999 PN250a reducer type, size and technical requirements JB/T1308.17-1999 standard download decompression password: www.bzxz.net

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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 pressurevalvesand fittings
1999-07-12Promulgated
State Machinery Industry Bureau
2000-01-01Implementation
1Scope
Machinery Industry Standard of the People's Republic of China
PN250MPa Reducers
Type, dimensions and specifications of PN 250 MPa reduced pipes
This standard specifies the types, dimensions and technical requirements of reducers for ultrahigh pressure valves. This standard applies to reducers for neutral media such as ethylene and polyethylene with a nominal pressure of PN250MPa. Reference standards
JB/T1308.17-1999
Replace JB1324-73
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. Stainless steel bars
GB/T1220-1992
JB/T1308.2-1999PN250MPa Technical conditions for valves, pipe fittings and fasteners JB/T1308.3-1999PN250MPa Pipe end types, dimensions and technical conditions Structural types and dimensions
The types of reducers shall be as specified in Figure 1.
Maintenance information
Approved by the State Machinery Industry Bureau on July 12, 1999 36
Maintained
Implemented on January 1, 2000
3.2 The dimensions of the reducer shall be in accordance with the provisions of Table 1. Nominal
10 ×3
15×10
20 ×10
20 ×15
25 ×15
25×20
Thread code
M14×1.5 left
M20×1.5 left
M33x×2 left
M48×2 left
M60x3 left
4Technical requirements
Thread code
M10×1 left
M14×1.5 left
M20×1.5 left
M33×2 left
M48×2 left
JB/T1308.17-1999
Dimension code differenceDimension deviationDimension code differenceDimension deviationDimension deviationDimension deviation
Dimension deviation
110|3528
+2.0| 58+2.0215
The material of the reducer is 2Cr13, and the technical requirements are in accordance with the provisions of GB/T1220. 4.1
The mechanical properties after heat treatment are in accordance with the provisions of Table 2. 4.2
Material grade
Tensile strength 0,
Service point. ,
≥588
4.3The end of the reducer is in accordance with the provisions of JB/T1308.3. Elongation 5,
Contraction rate medium
4.4The reducer is subjected to ultrasonic and magnetic particle inspection in accordance with the provisions of JB/T1308.2. Marking example
Reducer with nominal diameter 20×15:
Reducer DN20×15JB/T1308.17-19994840
Impact value A
≤248
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