JB/T 1308.6-1999 This standard is a revision of JB 1313-73 "Pg (2500kgf/cm2) Cone Gaskets, Cone Blind Gasket Types, Dimensions and Technical Requirements". This standard specifies the types, dimensions and technical requirements of cone gaskets and cone blind gaskets for ultra-high pressure valves. This standard is applicable to cone gaskets and cone blind gaskets for neutral media such as ethylene and polyethylene with a nominal pressure of 250MPa. This standard was first published on the date of year. JB/T 1308.6-1999 PN250a Cone Gaskets, Cone Blind Gasket Types, Dimensions and Technical Requirements JB/T1308.6-1999 Standard download decompression password: www.bzxz.net

1C.S 23.060
Machinery Industry Standard of the People's Republic of China
JB/T1308.1-1308,21-1999www.bzxz.net
PN250MPa ultrahighpressure valves and fittings
Technical conditions
Speclfcations for PN 2S0 MPa ultrahighpressure valves and fittings1999-07-12Promulgated
State Bureau of Machinery Industry
2000-01-01Implementation
1Scope
Machinery Industry Standard of the People's Republic of China
PN250 MPa conical face pad, conical face blind pad
Type, dimensions aad specinicatlons orPN 250 MPa gaskets and canical face blied This standard specifies the pressure, type, size and technical requirements of factory pressure doors. The standard in JB/T 1308.61999[33-73] is applicable to the pressure of PN250MP for gaskets, ethylene, ethylene and other neutral materials. 2 Referenced standards The texts contained in the following standards constitute or are the provisions of this standard through reference in this standard. When this standard was issued, the versions shown are all valid. All standards are subject to revision. All parties using this standard shall discuss the possibility of using the latest versions of the following standards: GB, T1804 [992-General tolerances for final tolerances of material dimensions GR/T30771988 Technical conditions for metal-containing structural steel JRT1308.21999 Technical conditions for PN250MPa valves, fittings and fasteners 3 Structural requirements and dimensions
3.1 Non-surface gasket type shall be in accordance with the drawing, and non-surface gasket type shall be in accordance with the provisions of Figure 2. 3.2/
Approved by the State Machinery Industry Bureau on July 12, 1999 and implemented on January 1, 1999
.FB/T1308.6—1999
3.2 Tank surface gaskets and paving dimensions shall be in accordance with the provisions of Table 1. Table
Nominal head diameter
4 Technical requirements
10±3c1
4.1 Conical pad, dimension surface material 42CrMo. Technical requirements shall comply with the provisions of GB/T3077. 4.2 Hardness after heat treatment HB = 260-300. 4.3 The sealing cone surface shall not have defects such as scratches and depressions. 4.4 The technical tolerance of the plate marking size shall be in accordance with the provisions of step 1 or 4.
Filling surface gasket
4.5 Conical surface gaskets and chain surface gaskets shall be inspected by wave flaw detection, magnetic particle flaw detection and other technical requirements in accordance with the provisions of JH/T1308.2. Marking example
Conical surface gasket with nominal diameter of 15mm, conical surface gasket: Conical surface gasket DN15JB/T1308.6-1999, Conical surface gasket DN15BT1308.6-199914
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