This standard specifies the structural dimensions and technical requirements of spiral wound gaskets for pressure vessel flanges. JB/T 4705-2000 Spiral wound gasket JB/T4705-2000 Standard download decompression password: www.bzxz.net

JB/T 4705—2000
Spiral wound gaskets
Industry standard of the People's Republic of China
Spiral wound gaskets
JB/T4705—2000
Replaces JB47051992
20012715
This standard specifies the structural dimensions and technical requirements of spiral wound gaskets for pressure vessel flanges. This standard is applicable to spiral wound gaskets for JB/T4702--2000 "Type B flat welding flange" and JB/T4703-2000 "Long neck butt welding flange". 2
Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T42391993 Stainless steel and heat-resistant steel cold-rolled steel strip GB/T4622.3—1992 Technical conditions for spiral wound gaskets 3 Codes, markings and marking examples
3.1 Code
The materials and codes of metal strips shall be in accordance with the provisions of Table 1. 3.1.13
Metal strip materials
OCr18Ni9
0Cr17Ni12Mo2
00Cr17Ni14Mo2
OCr18Ni10Ti
OCr18Ni12Mo2Ti
00Cr19Ni10
The materials and codes of filling strips shall be in accordance with the provisions of Table 2. The materials of filling strips shall comply with the provisions of relevant standards or specifications. Table 2
Filling strip material
Special asbestos
Flexible graphite
Polytetrafluoroethylene
3.1.3 The structural type and code of the gasket shall be in accordance with the provisions of Table 3. The material of the inner reinforcement ring is the same as that of the metal strip, and the material of the outer reinforcement ring is carbon steel. If other materials are used, they should be indicated in the remarks column of the drawing list. State Bureau of Machinery Industry
State Bureau of Petroleum and Chemical Industry
Approved on April 24, 2000
Implemented on September 30, 2000
3.2 Marking
Gasket type
Basic type
With inner reinforcement ring
With outer reinforcement ring
With inner and outer reinforcement rings
JB/T4705-—2000
Standard number
Nominal pressure, MPa
Nominal diameter, mm
Filling belt code
Steel belt code||t t||Structural type code of gasket
3.3 Marking example
Nominal diameter 1000mm, nominal pressure 2.50MPa, steel strip is 0Cr13, filling strip is special asbestos, spiral wound gasket with inner reinforcement ring:
Gasket B51-1000-2.50
4 Structural type and size
JB/T47052000
Flat sealing surface of lining ring, concave and convex sealing surface of lining ring, sample groove sealing surface of lining ring The structural types and sizes of flat sealing surface, concave and convex sealing surface, sample groove sealing surface and spiral wound gaskets for flanges shall be in accordance with the provisions of Figure 1 and Table 4. D
Basic type
With external reinforcement ring
With internal and external reinforcement rings
With internal reinforcement ring
JB/T4705—2000
Ban'Nd
JB/T4705—2000
a) When used on a flat sealing surface, the gasket should be provided with an external reinforcement ring or with internal and external reinforcement rings; b) When used on a concave and convex sealing surface, the gasket should be provided with an internal reinforcement ring; c) When used on a groove sealing surface, the gasket should adopt the basic type. Limit deviation of gasket size
The limit deviation of gasket size shall comply with the provisions of Table 5. Table 5
Nominal diameter DNwww.bzxz.net
≥300~1200
>1200~3000
Outer diameter of outer reinforcement ring
Other technical requirements for gaskets
Outer diameter of gaskets
Other technical requirements for gaskets shall comply with the provisions of GB/T4622.3. 72
Inner diameter of whole piece
Inner diameter of inner reinforcement ring
Gasket thickness
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