JB/T 1308.10-1999 JB/T 1308.10-1999 PN250a External nut types, dimensions and technical requirements JB/T1308.10-1999 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 fittingswww.bzxz.net
Technical conditions
Speclfcations for PN 2S0 MPa ultrahighpressure valves and fittings1999-07-12Promulgated
State Bureau of Machinery Industry
Implementation on 2000-01-01
［Scope
Machinery Industry Standard of the People's Republic of China
PN 250 MPa outer nuts
Type, dimensions and technical conditions
luts
This standard specifies the type, size and technical requirements of the outer nut for ultra-high pressure lubrication. This standard applies to the outer nuts of ethylene, ethylene-end and other neutral medium with a nominal pressure of PN250MPa, 2 Reference standards
JB/T1308.10-1999
Old 1317-73
The provisions contained in the following standards constitute the provisions of this standard through reference in the whole standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and all parties using this standard should consider the possibility of using the latest versions of the following standards. GA/T 196—1981
GDT197—1981
Basic size of ordinary screw (diameter 1-60mm) Ordinary screw effect tolerance and fit [diameter 1~355mm] Unindicated tolerance of over-tolerance linear size
GB.T18041992
GD/T3077—1988
Technical conditions for alloy structural steel
JB130B.2—1999PN250MPaTechnical conditions for valves, pipe fittings and peripheral parts 3 Structural types and sizes
3.1 The type of external explosion nut DN3 shall be as specified in Figure 1: DN6, DN0, DN[5 shall be as specified in Figure 2, and the rest shall be approved by the State Administration of Machinery and Sugar Industry on July 1, 1999
2800-01-0! Implementation
3.2 The dimensions of the external blasting shall be in accordance with the provisions of Table 1: Main diameter
Screw number
M24 x2 hl1
M33×2-6H
M48×2-611
Technical requirements
JB/T 1308.10-1999
4.1 Material 35CrMoA, technical requirements shall be in accordance with the provisions of GB3077. d.2 The hardness after heat treatment shall be HB-248-302.12
4.3 The basic dimensions shall be in accordance with the provisions of GBT196, and the accuracy shall be 6H level specified in GBT19?. 312
4.4 The surface of the thread should not have defects such as shaving effect and sink marks that affect the length, and the incomplete first circle should be removed: 4.5 The dimension tolerance of the mechanical pressing work not specified shall comply with the provisions of GB/T1804. 4.6 Take measures to prevent the price from biting when cutting the part of the medium. 4.7 Other technical requirements shall comply with the heat setting of JBT1308.2. s Marking Example
External thread of the common displacement diameter 1Smn:
External thread of DN5JB/1308.101999
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