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
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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)bzxz.net 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 1-500 Price RMB 5.00 Mechanical Industry Standard Service Network: http://www.JB.ac.cn1661_9691 /81 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.