This standard specifies the structural type, dimensions and technical requirements of flat handwheels. JB/T 1693-1991 Flat handwheel JB/T1693-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T1693-1991
Flat Handwheel
Published on July 23, 1991
Ministry of Machinery and Electronics Industry
Implemented on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Subject Content and Scope of Application
This standard specifies the structural type, dimensions and technical requirements of flat handwheels. This standard applies to general valves.
Referenced Standards
GB1804
GB12227
Type and Dimension
Tolerance and Fit Limit Deviation of Dimensions Without Tolerance Note Technical Conditions for Ductile Iron Parts of General Valves
Parallel handwheels are divided into four structural types: A, B, C and D. 3.1 The structural types of type A, type B and type C are shown in Figure 1; the dimensions are as specified in Table 1. 3.2D type structure is shown in Figure 2; dimensions are in accordance with the provisions of Table 2. Ministry of Machinery and Electronics Industry approved JB/T 1693 - 1991 on July 23, 1991 to replace JB1693-75. Implementation on July 1, 1992. JB/T1693-1991. JB/T1693-1991. JB/T1693-1991. Calculation of the enclosure. JB/T 1693 - 1991. 4 Technical requirements. 4.1 The material is QT400-17, and the technical requirements are in accordance with the provisions of GB12227. 4.2 The casting fillet is R1.5~5mm if not specified. 4.3 The surface should be flat and smooth, without burrs and sharp edges. 4.4 The axis of the handwheel hole should be perpendicular to the machined end face of the hub. 4.5 The tolerance grade of dimensions without tolerances shall be IT14 as specified in GB1804. 115
4.6 Except for D, H, S, d, and M dimensions in this standard, the remaining dimensions are reference dimensions. Additional remarks:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry.
Arrows and letters
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. 13
(Calculated density 7.0)
4 Technical requirements
JB/T1693-1991
4.1 The material is QT400-17, and the technical requirements are in accordance with the provisions of GB12227. 4.2 The casting fillet is R1.5~5mm if not specified. 4.3 The surface should be flat and smooth, and there should be no burrs or sharp edges. 4.4 The axis of the handwheel hole should be perpendicular to the machined end face of the hub. 4.5 The tolerance grade of the unspecified tolerance size is IT14 as specified in GB1804. Except for D, H, S, d, and M dimensions in this standard, the remaining dimensions are reference dimensions. 4.6
Additional notes:
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 Zhang Huayou, Hong Miancheng, Lu Peiwen and Wang Jingxin. 6
People's Republic of China
Mechanical Industry Standard
Flat Handwheel
JB/T 1693 - 1991
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Print Sheet 5/8www.bzxz.net
Word Count 12.000
First Printing in January 1993
First Edition in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn1661 - 691 L/AF
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