This standard specifies the structural type, dimensions and technical requirements of valve stem nuts (V). This standard is applicable to diaphragm valves with nominal pressure pn0.60MPa and nominal diameter DN15~200mm. JB/T 1698-1991 Valve stem nuts (V) JB/T1698-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 1698-1991
Stem Nut (V)
Published on 1991-07-23
Ministry of Machinery and Electronics Industry
Implemented on 1992-07-01
Mechanical Industry Standard of the People's Republic of China
Stem Nut
Subject Content and Scope of Applicationwww.bzxz.net
(V)
This standard specifies the structural type, dimensions and technical requirements of stem nuts (V). This standard applies to diaphragm valves with a nominal pressure of pv0.60MPa and a nominal diameter of D%15~200mm.
2 Reference standards
GB1176
GB1804
GB12227
GB5796.1~5796.4
3 Types and sizes
Ordinary thread
Ordinary thread
Basic dimensions (diameter 1~600mm)
Tolerance and fit (diameter 1~355mm)
Casting copper alloy
Tolerance and fit Limit deviation of dimensions without tolerance Technical conditions for ductile iron parts
General valve
Trapezoidal thread
The structural type of stem nut (V) is shown in the figure and the dimensions are as specified in the table. Re.5
The Ministry of Machinery and Electronics Industry approved JB/T1698-1991 on July 23, 1991
Replaced JB1698-75
Other V
Implemented on July 1, 1992
Tr14X3LH—7H
Tr16×4LH—7H
Tr20X4LH
Tr24X5LH
Tr28× 5LH—7H
Tr36X6LH—7H
Technical requirements
M27×2
M30×2
M45×2
M56×2
M24×2 left
M27×2 left
M30X2 left
M36X2 left
M42×2 left
M52×2 left
JB/T 1698-1991
Mass (calculated density 8.5)
4.1 When the material is ZHMn58—2—2, the technical requirements shall be in accordance with the provisions of GB1176: When the material is QT500—5, the technical requirements shall be in accordance with the provisions of GB12227.
4.2 The dimensions of common threads shall comply with the provisions of GB196, and the tolerances shall comply with the provisions of GB197. The dimensions and tolerances of trapezoidal threads shall comply with the provisions of GB5796.1~5796.4. 4.3
The tolerance grade of dimensions without tolerances shall comply with IT14 specified in GB1804. 4.4
Additional remarks:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. 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. 2
Democratic Communist Party:
Mechanical Industry Standard
Rod Nut (V)
JB/T 16981991
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Print Sheet 3/8
Word Count 4,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn161869
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