This standard specifies the structural type, dimensions and technical requirements of threaded stem nuts. This standard is applicable to gray cast iron gate valves with nominal pressure pN1.0MPa and nominal diameter DN50~450mm. JB/T 1696-1991 Stem Nuts (III) JB/T1696-1991 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T1696-1991
Stem Nut
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 Application
This standard specifies the structural type, size and technical requirements of the lower threaded stem nut. This standard is applicable to gray cast iron gate valves with a nominal pressure of Pv1.0MPa and a nominal diameter of D=50~450mm. 2 Reference standards
GB1176
GB1804
GB5796.1~5796.4
3 Types and dimensions
Cast copper alloy
Tolerances and fits Limit deviations of trapezoidal threads without tolerance dimensions
The structural type of the stem nut (III) is shown in the figure, and the dimensions are as specified in the table. Cx45°
The Ministry of Machinery and Electronics Industry approved JB/T1696-1991 on July 23, 1991
to replace JB1696-75
The remaining 9
implemented on July 1, 1992
Tr18×4LH7H
Tr20×4LH7H
Tr24×5 LH—7H
Tr28×5 LH—7H
Tr36X6LH7H
Tr44×8LH-7H
4Technical requirements
JB/T1696-1991
The material is ZHMn58—2—2, and the technical requirements are in accordance with the provisions of GB1176. 4.1
2 The dimensions and tolerances of trapezoidal threads shall comply with the provisions of GB5796.1~5796.4. 4.2
The tolerance grades of dimensions without tolerances shall comply with the provisions of GB1804. 4.3
Additional remarks:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. A
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 Zhang Huayou, Hong Miancheng, Lu Peiwen and Wang Jingxin. 2
Mass (calculated density 8.5)
People's Republic of China
Mechanical Industry Standard
Stem Nut
(III)
JB/T16961991
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
Sheet 3/8
Word Count 4,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500bZxz.net
Price RMB 5.00
Mechanical Industry Standard Service Network: http://www.JB.ac.cn1661_9691 /81
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