JB/T 1308.7-1999 JB/T 1308.7-1999 PN250a Screw type, size and technical conditions JB/T1308.7-1999 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 fittings
Technical conditions
Speclfcations for PN 2S0 MPa ultrahighpressure valves and fittings1999-07-12Promulgated
State Machinery Industry Bureau
2000-01-01Implementation
Scope
Machinery Industry Standard of the People's Republic of China
PN20MPa Screw sleeve
Type, dimensions and technical conditions
collars
This standard specifies the type, size and technical requirements of collars for super-high pressure valves. This standard is used for collars for medium-pressure media such as ethylene and ethylene with a pressure of PN250MPa. 2. Reference to the standard
JE/T1308.7—1999bZxz.net
Replaces [314-73
The following standards contain provisions that constitute the text of the production standard by citing them in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using technical standards should explore the possibility of using the latest versions of the following standards: GB/T 196198: GB/T 197-1991 GB/T1B04-1992 GE/T 1077--19BB General basic dimensions (diameter 1-60mm) General tolerances and fits (diameter 1~355mm) General tolerances Technical tolerances for linear dimensions Technical conditions for alloy structural steel PV25DMPa Technical conditions for doors, fittings and screwdrivers JB, T1308.2-1999 3 Structural types and dimensions 3.1 The type shall be in accordance with the provisions of Figure 1.
Approved by the State Machinery Industry Bureau on July 12, 2000
Implemented on January 1, 2000
The screw thread dimensions shall be in accordance with the provisions of Table 1.
Nominal diameter
Screw thread code
MI0×14-6H
M14×1.5 ±-6TT
M20x1.5-61
M33×2 ±-6H
4According to technical requirements
JB/E13P8.7—1999
Sheath material 35CTMnA, technical requirements are in accordance with GB/T077. 4. 1
4.1 The hardness of the heat treatment sheet is HB = 21~302:
4.3 The basic dimensions of the end thread shall be in accordance with the provisions of GB/T196, and the tolerance shall be in accordance with the 6H grade accuracy specified in GB/T197. 4.4 The thread surface shall not have cracks, sun sinks and other defects that affect the strength, and the incomplete thread of the first circle shall be removed. 4.5 The machine defects noted in the technology shall be added. 1 The dimensional tolerance shall be in accordance with the provisions of 4 of D/T1B. 4.6 Take measures to prevent damage. 4. For other technical requirements, the marking example shall be in accordance with the provisions of JB/T130B.2
The case with a nominal diameter of 15mm will be:
Screw sleeve DN15JB/T1308.7—1999
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