This standard specifies the structural type, size and technical requirements of the spacer rings used in valve stuffing boxes. JB/T 5208-1991 Spacer Ring JB/T5208-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 5208-1991
Published on 1991-07-23
Ministry of Machinery and Electronics Industry
Implementation on 1992-07-01
Mechanical Industry Standard of the People's Republic of China
1 Subject Content and Scope of Application
This standard specifies the structural type, size and technical requirements of the spacer ring for valve stuffing box. JB/T5208-1991
This standard is applicable to cast steel gate valve stuffing box with nominal pressure P1.6~6.4MPa and nominal diameter Ds50~300mm. 2 Reference standards
GB1220
GB1804
Basic dimensions of common thread (diameter 1~600mm) Common thread
Stainless steel rod
Tolerance and fit (diameter 1~355mm)
Tolerance and fit
3 Types and sizes
Limit deviation of dimensions without tolerance
The structure of the spacer ring is shown in the figure, and the dimensions are in accordance with the provisions of Table 1. Ying YumengwwW.bzxz.Net
1-M4-6H
2 at each end
Approved by the Ministry of Machinery and Electronics Industry on July 23, 1991 D
Implemented on July 1, 1992
Wide rod thread diameter
Technical requirements
Material is in accordance with the provisions of Table 2.
1Cr18Ni9
0Cr17Ni17Mo2
JB/T5208-1991
Standard No.
GB1220
Ordinary thread dimensions shall comply with GB196, and tolerances shall comply with GB197. The tolerance grade of dimensions without tolerances shall comply with IT14 specified in GB1804. Additional Notes:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. 6
(Calculated density 7.75)
Heat treatment
Solidification treatment
This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry and the Beijing Valve Research Institute. The main drafters of this standard are Lu Peiwen, Zhang Huayou, Hong Miancheng, and Wang Jingxin. People's Republic of China: Mechanical Industry Standard JB/T52081991 Published and issued by the China Academy of Mechanical Science Printed by the China Academy of Mechanical Science (No. 2 Shouti South Road, Beijing, zip code 100044) Format 880×1230 Printing Sheet 3/8 Word Count 4,000 First Edition January 1993 First Printing January 1993 Print Quantity 1-500 Price RMB 5.00 Mechanical Industry Standard Service Network: http://www.JB.ac.cn1661_80 /
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