JB/T 8531-1997 This standard specifies the technical requirements, test methods, inspection rules, marking, packaging and storage of manual valve devices (hereinafter referred to as manual devices). This standard applies to manual valve devices for gate valves, stop valves, throttle valves, diaphragm valves, ball valves and butterfly valves that are directly operated by human power through a worm gear pair, gear pair or other reduction transmission. JB/T 8531-1997 Technical conditions for manual valve devices JB/T8531-1997 Standard download decompression password: www.bzxz.net

JB/T8531-1997
This standard is proposed and regulated by the National Technical Committee for Valve Standardization. The drafting unit of this standard: Dajin Second General Machinery Co., Ltd.
The main drafters of this standard: Kou Guoqing, Liu Qichang, Yan Zhongming, Zhao Guangyuan, Cheng Rujing, Zhou Rulin. 529
1 Scope
Machinery Industry Standard of the People's Republic of China
Technical Conditions for Manual Devices of Valves
JB/T85311997
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging and storage of manual devices of valves (hereinafter referred to as manual devices).
This standard is applicable to manual devices for valves such as gate valves, stop valves, throttle valves, diaphragm valves, ball valves and butterfly valves that are directly operated by human power through worm gear brushes, gear pairs and other reduction transmissions.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. The versions shown are all valid when this standard is published. All standards are subject to revision. Parties using this standard should explore the feasibility of using the latest versions of the following standards: GB3181--82 Standard sample of paint film color
GB12222-89 Connection of multi-turn valve drive device GB12223-89 Connection of part-turn valve drive device 3 Technical requirements
3.1 The manual device should be able to work normally under the working environment temperature of -20 to 60 (conditions. 3.2 The connection type and size of the manual device and the valve shall comply with the provisions of G312222 and GB12223 3.3 The outer surface of the manual device should be flat and smooth, without cracks, burrs, sulfur bumps and other defects that affect the appearance quality. 3.4 The paint layer on the outer surface of the manual device should be firmly attached, flat, light-retardant, uniform in color, free of oil stains, indentations and other mechanical damage: the paint color is generally the silver-gray code B04 specified in GB3181. 3.5 Before the manual device leaves the factory, the inside of the box should be clean and free of debris, and lubricating oil or grease should be injected according to the requirements. 3.6 The materials of the main parts of the manual device should have a factory certificate, chemical composition and mechanical performance inspection report. 3.7 The manual device should operate smoothly and flexibly. 3.8 The direction of rotation of the handwheel of the manual device (looking at the handwheel) and the direction of rotation of the output shaft (along the axis of the output shaft facing the valve) is clockwise for closing and counterclockwise for opening. There should be a direction indicator on the H handwheel. 3.9 The manual device for partial rotation should be equipped with a mechanical limit mechanism, which should be able to reliably adjust the required fully open and fully closed positions. 3.10 The allowable torque or thrust value output by the manual device should be the nameplate value. 3.11 The maximum handwheel force should generally be less than 450N. When it is greater than 450N, a force-enhancing rod is allowed. 3.12 The actuator should withstand instantaneous 2 times the nameplate torque or thrust. All load-bearing parts should not be damaged. 4 Test method
4.1 Surface, painting and internal inspection
H Visual inspection should comply with the provisions of 3.3, 3.4 and 3.5. 4.2 Operation inspection
Under no-load condition, turn the hand wheel clockwise and counterclockwise respectively, so that the output vehicle rotates not less than · turns (multiple turns for the driving device) or not less than · turns. Approved by the Ministry of Machinery Industry of the People's Republic of China on April 15, 199733
Implementation on January 1, 1998
JB/T 8531
：1997
90° (partial rotation on the moving device). Rotate for no less than two times. Check that the operation of the manual device complies with the provisions of 3.7. 4.3 Check the rotation direction of the handwheel and the output shaft. Under no-load conditions, turn the handwheel clockwise and counterclockwise respectively to check that the rotation direction of the output shaft of the manual device complies with the provisions of 3.8. 4.4 Mechanical limit mechanical inspectionWww.bzxZ.net
Under no-load conditions, adjust the mechanical limit mechanism and tighten it to the limit position (open and close). Turn the handwheel. Check that the running stroke of the output shaft meets the requirements of 3.9
4.5 Output torque or thrust test
4.5.1 When the manual device is only subjected to torque, install the manual device on the test bench, turn the handwheel clockwise and gradually load it. The output of the manual device reaches 1.2 times the nameplate torque value, which should meet the requirements of 3.10. 4.5.2 When the manual device is subjected to torque and thrust at the same time, install the manual device on the test bench, so that the axis direction of the output shaft of the manual device is subjected to 1.2 times the nameplate force value, which should meet the requirements of 3.10. 4.6 Strength test
4.6.1 When the manual device is subjected to torque, install the manual device on the test bench, turn the handwheel clockwise and gradually load it. The output of the manual device reaches 2 times the nameplate torque value, and the duration is not less than 3s. Immediately unload it, disassemble and check that all load-bearing parts of the manual device meet the requirements of 3.12.
4.6.2 When the manual device is subjected to torque and thrust at the same time, install the manual device on the test bench, so that the output shaft of the manual device is subjected to 2 times the thrust value on the nameplate in the axial direction, and the duration is not less than 3$. Immediately unload and disassemble to check that all load-bearing parts of the manual device meet the requirements of 3.12.
5 Inspection rules
5.1 Factory inspection
5.1.1 Each manual device shall be subjected to factory inspection. 5.1.2
The items and technical requirements of factory inspection shall be in accordance with the requirements of Table 1. Table 1
Inspection items
Appearance inspection
Internal inspection
Operation condition
Pulley direction
Mechanical limit
Output rotation correction or thrust test
Strength test
5.2 Random inspection
Inspection rules
Factory inspection Random inspection Type inspection
Technical fee requirements
Should comply with the provisions of 3.3 and 3.4
Should comply with the provisions of 3.5
Should comply with the provisions of 3.7
Should comply with the provisions of 3.8
Should comply with the provisions of 3.9| |tt||Should comply with the provisions of 3.10
Should comply with the provisions of 3.12
5.2.1 Random sampling inspection shall be carried out by randomly selecting from the manual devices in stock that have passed the inspection by the quality inspection department of the production plant. The sampling rate of the same specification is 3% (not less than two units)
5.2.2 The items and technical requirements of the random sampling inspection shall be in accordance with the provisions of Table 1. If there are unqualified units, the sampling inspection shall be doubled. After the re-inspection, if there are still non-conforming items, each unit shall be inspected.
5.3 Type inspection
5.3.1 Type inspection shall be carried out in any of the following situations: a) Trial production and identification of new products;
JB/T 8531—1997
b) After formal production, when there are major changes in structure, materials, and processes that may affect product performance; c) After 5 years of mass-produced manual devices; d) When manual devices that have been discontinued for more than 5 years are produced again;) When the national quality supervision agency proposes type inspection requirements. 5.3.2 The items and technical requirements for type inspection shall be in accordance with the provisions of Table 1. 6 Marking, packaging and storage
6.1 Marking
6.1.1 The nameplate material and the method of engraving the data on the nameplate should ensure that the handwriting is not easily erased during the entire service life of the manual device. 6.1.2 The nameplate should be fixed in a conspicuous place on the main box of the manual device, and the contents to be indicated are as follows: a) Manufacturer name;
b) Product name and model;
c) Allowable torque or thrust;
d) Product number;
) Date of manufacture.
6.2 Packaging| |tt||6.2.1 The manual device should be packed and shipped and should be fixed in the box. 6.2.2 The packaging box should be rainproof and firm.
6.2.3 The words and signs on the outer wall of the packaging box should be clear and neat, and the contents are as follows: a) Manufacturer's name;
b) Name of the receiving station and receiving unit;
c) Product name and model;
d) Gross weight and volume (length x width x height). 6.2.4 The manual device should be shipped in a box. The product certificate, product manual and packing list should be attached when the product is shipped to the factory. 6.2.5 The product packing list should indicate the following contents and be stamped by the inspector: a) Manufacturer name and address; b) Product name and model: c) Product number; d) Product net weight; e) Attached file name and quantity: f) Packing quantity; g) Packing date. 6.3.1 Before the product is shipped, the exposed processed surface should be coated with anti-rust oil. 6.3.2 The product should be stored in a ventilated and dry place and should not be stored in the open air. 532
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