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
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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 conditionsWww.bzxZ.net 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 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.