JB/T 1308.4-1999 This standard is a revision of JB 1311-73 "Type, size and technical requirements of neck joints for Pg (2500kgf/cm2)". This standard specifies the type, size and technical requirements of neck joints for ultra-high pressure valves. This standard is applicable to neck joints for neutral media such as ethylene and polyethylene with a nominal pressure of 250MPa. This standard was first published on 2011-03-1999. JB/T 1308.4-1999 PN250a Neck joint type, size and technical requirements JB/T1308.4-1999 Standard download decompression password: www.bzxz.net

1C.S 23.060
Standard of the Machinery Industry of the People's Republic of ChinaWww.bzxZ.net
JB/T1308.1-1308,21-1999
PN250MPa ultrahigh pressure valves and fittings
Technical conditions
Speclfcations for PN 2S0 MPa ultrahighpressure valves and fittings1999-07-12Release
State Machinery Industry Bureau
2000-01-01Implementation
Standard of the Machinery Industry of the People's Republic of China
PN250.MPa necked joint
Type, size and technical conditions
Type, size and technical conditions The standard specifies the types, sizes and technical requirements of pre-joints for ultra-high pressure valves JR/T1308.4-1999
JR/T1311-73
This standard is applicable to neck joints for polyvinyl chloride media with a nominal pressure of V250MPa. The provisions contained in the subscripted mark of the referenced standard constitute the provisions of the technical standard through reference in the part standard. At the time of publication of this standard, the versions shown are valid: All standards are subject to revision. Parties using technical standards should consider using the latest versions of the following standards as appropriate: GB/T 3—1997 GBT 196:981 G8/F157—19961 GB104—192 Standard thread dimensions (diameter 1-600mm) Standard thread dimensions (diameter 1-355mm) Small linear dimensions not specified [38.2-250MP, pipe fittings and hardware 3 Structural types and dimensions 3.! The type of the neck joint is as follows: 1. Approved by the National Machinery Industry Bureau on July 12, 1999, and implemented on January 01, 2000. 3.2 The size of the neck joint is determined according to the table 1. M23x1.56e M24 ×2-62 M332 6g 3648 ×2-6g M18*2±-62* M48×2 left 6g M50*3 4-6g- M60 ×3 left -6g M72 ×3+-6g*
Note: · No. groove heating Fujian door
4 Technical requirements
JB/T1309.4-1904
4.1 The basic size of the explosion shall be in accordance with the provisions of GB/[196, and the 6-grade precision specified in GB/T197. The bottom of the tooth groove is round. 4.2 The effect-modification shall be in accordance with the provisions of the core B door 3: 4,3 The surface of the clothing should not have defects such as depressions that affect the degree of avoidance, and the incomplete baking pattern of the first doctor should be eliminated. 4.4 The intersection of the end of the transfer joint and the inner hole should maintain a sharp angle and should not have a scratch structure. The quick drop before the return of the shape is sealed. 4.5 Unspecified analysis of hunger. Size tolerances shall be in accordance with the provisions of GB18U4. 4.6 Take measures at the bottom of the threaded part to prevent safety. 4.7 Other technical requirements shall be in accordance with the provisions of [B13%.2, 12
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