Some standard content:
JB/T 8692--- 1998
This standard is proposed by the National Technical Committee for Standardization of Valves and is under the jurisdiction of: Introduction
The responsible drafting units of this standard are: Hefei General Machinery Research Institute of the Ministry of Machinery Industry, Shijiazhuang Valve Co., Ltd., Dajintang Watts Valve Co., Ltd., and Qidong Valve Co., Ltd. of Jiangsu Province. The main drafters of this standard are: Liu Yang, Liu Jing, Zhao Tienan, Yu Zhitao, Shi Ying, Yang Junjian1 Scope
Machinery Industry Standard of the People's Republic of China
Butterfly valves for gas flueJB/T 8692 --- 1998
This standard specifies the classification, requirements, test methods, inspection rules and marking, packaging, transportation, storage and other requirements of flue butterfly valves for intercepting and regulating flow.
This standard applies to flue butterfly valves (hereinafter referred to as butterfly valves) with nominal pressure PN not greater than 0.6MPa, nominal diameter DN not greater than 3000mm, temperature not higher than +150 (: the medium is air, dusty flue gas and industrial gas, etc., flange and wafer connection. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards GB150-89 Steel pressure vessels
GB/T1047-95 Nominal diameter of pipeline components GB1048--90 Nominal pressure of pipeline components
G13/T11841996 Shape and position tolerances End note tolerance value GB9115.1~9115.2-88 Flat butt welding steel pipe flange GB 9131
GB12220
GB12221
GB12223-
GB 12238-
Pressure-temperature grades for steel pipe flanges
General valve markings
Structural length of flange-connected metal valves
Connection of drive units for part-turn valves
General valve flanges and wafer-connected butterfly valves
GB/T 15188. 2
JB 10678
JB 308--~75
94·Structural length of valves Wafer-connected valves
JB/T 5300---91
JB/T 7748--95
JB/T 7928—95
ZB J16 006 - 90
3 Classification
3.1 Structural type
Marking and identification paint
Model compilation method
General valve materials
Valve cleanliness and measurement method
General valve supply requirements
Valve testing and inspection
3.1.1 The structural type of butterfly valve is divided into shut-off type and regulating type. Its basic structure and main parts are shown in Figures 1 and 2. 3.1.2 The connection forms of butterfly valve include flange and butt connection. 3.2 Model
The model compilation of butterfly valve shall be in accordance with the provisions of JB308. Approved by the Ministry of Machinery Industry of the People's Republic of China on March 19, 1998 and implemented on July 1, 1998||t t||3.3 Parameters
[B/T8692
The nominal diameter of the butterfly valve shall be in accordance with the provisions of GB/T1047. The nominal pressure of the butterfly valve shall be in accordance with the provisions of GB1048. 9
End cover; 2 Valve body; 3 Bearing; 4 Butterfly plate; 5
6 Felt ring; 7 Packing; 8 Packing gland; 9-Drive device Figure 1 Shut-off type flue butterfly valve
1--End cover; 2 Valve body; 3 Bearing; 4 Butterfly plate: 5 Valve stem; 6 Felt ring; 7 Packing; 8 Packing gland; 9--Drive device Figure 2 Regulating flue butterfly valve
4 Requirements
4.1 Butterfly valves are suitable for the following conditions of use:
a) Shut-off and low leakage;
b) Regulating flow within the specified range.
4.2 Pressure-temperature rating
JB/T 8692—1998
The pressure-temperature rating of butterfly valves shall comply with the provisions of GB9131. 4.3 Shell and sealing performance
4.3.1 The shell strength of butterfly valves shall comply with the requirements of ZBJ16006. 4.3.2 The seal of butterfly valves shall be subjected to air pressure sealing test at a test pressure of 1 times the nominal pressure. The maximum allowable leakage rate shall not exceed the provisions of formula (1):
L,=K× DN°×V×10t
In the formula; lo
Maximum allowable leakage rate, Nm/h;
Leakage coefficient, as specified in Table 1;
Nominal diameter of butterfly valve, mm;
pTest pressure, Pa
Leakage coefficient of butterfly valve
Nominal diameter DV
350~600
700-900
1 000--1 200
1 300-~1 500
1600-~1800
2 000~~2 200
2 100~2 600
2 800~3 000
Note: Class C leakage rate is used for working conditions where leakage is not considered. Drainage coefficient K
4.3.3 The external leakage air tightness of the butterfly valve should be leak-free under the test pressure of 1.1 times the nominal pressure. 4.4 Valve body
4.4.1 The flange connection dimensions and sealing surface form of the butterfly valve shall comply with the provisions of GB9115. 4.4.2
The flange sealing surface shall be perpendicular to the axis of the butterfly valve channel. Its axis shall be coaxial with the axis of the butterfly valve channel! No provisions
The sealing surfaces at both ends of the flange shall be parallel to each other, and their parallelism shall comply with the 12-level precision connection flange in Table B3 of GB/T1184-1996. The bolt holes at both ends of the flange are allowed to have threaded bolt holes according to the structural requirements. The position tolerance of the axis of the flange bolt hole d relative to the axis of the flange hole shall comply with the provisions of Table 2. The structural length of the flange-connected butterfly valve shall comply with the provisions of GB12221. The structural length of the wafer-connected butterfly valve shall comply with the provisions of GB/T15188.2. The structural length of butterfly valves with a nominal diameter greater than 2000mm can be determined according to the requirements of the user. The minimum diameter of the valve seat shall not be less than the provisions of Table 3. 5 Use
Nominal diameter DN
Flange bolt hole diameter d
11.0~17.5
22.0~30.0
33.0)~48.0
56. 0~- 62.0
Minimum diameter of valve seat
JB/T8692 -1998
Position tolerance of flange bolt hole axis
Table 3 Minimum diameter of valve seat
Nominal diameter DN
Minimum diameter of valve seat
Position tolerance
Nominal diameter DN
The connection between valve seat and valve body should ensure that the valve does not loosen or leak during use. 4.4.10
The valve body can be formed by welding or casting. Its minimum wall thickness can be calculated by referring to Appendix A of GB12238n
Minimum diameter of valve seat
89
When the valve body adopts steel plate welded structure, its welding process and requirements for welders shall comply with the provisions of GB150. 4.4.12
4.5 Butterfly plate and valve stem
4.5.1 The butterfly plate and valve stem shall be designed to withstand a load of 1.5 times the maximum pressure difference of the medium acting on the butterfly plate when the medium flows in any direction.
4.5.2 The valve stem can be designed as an integral shaft or two separate short shafts. The length of the shaft hole should not be less than 1.5 times the shaft diameter.
4.5.3 The connection strength between the valve stem and the butterfly plate should be able to withstand the maximum torque transmitted by the valve stem. The connection method between the shaft and the butterfly plate can be arbitrary, but it should be ensured that it will not loosen under normal working conditions. 4.6 Bearings and stuffing boxes
4.6.1 During the test and use of the butterfly valve, the bearing should be able to withstand the maximum load transmitted by the valve stem, and the butterfly plate valve stem should rotate flexibly. 4.6.2 For butterfly valves with a nominal diameter of not less than 350mm, bearings that can withstand axial thrust should be selected. 4.6.3 The butterfly valve should be equipped with a dustproof structure to prevent particles in the medium from damaging the bearing. 4.6.4 The connection between the butterfly valve body and the drive device should be equipped with a heat insulation and heat dissipation structure. 4.7 Operation
4.7.1 The butterfly valve can be driven by dynamic, electric, hydraulic, pneumatic, etc. 4.7.2 For butterfly valves operated by a driving device, the driving device should be able to ensure that the butterfly valve can operate normally when the maximum pressure difference of the butterfly plate in the non-drained pipeline does not exceed the maximum working pressure of the valve. 4.7.3 The connection dimensions of the butterfly valve and the driving device shall comply with the provisions of GB12223. 4.7.4. For butterfly valves operated by handwheels (including handwheels of driving devices) or wrenches, unless otherwise specified in the order contract, when the handwheel or wrench is turned, the valve should be closed by turning the handwheel or wrench clockwise. 550
JB/T 8692.--.1998
4.7.5 The rim of the handwheel should have an arrow indicating the closing direction of the butterfly plate and the word "close". The word "close" should be placed at the front of the arrow. Arrows in the open and close directions and the words "open" and "close" can be marked. 4,7,6 Butterfly valves should have an indicator mechanism indicating the position of the butterfly plate and a limit mechanism to ensure that the butterfly plate is in the fully open and fully closed positions. 4.8 Materials
The selection of materials for the main parts of butterfly valves shall refer to the provisions of JB/T5300. Other materials may be used as replacements under the condition of ensuring product performance.
4.9 Coating
4.9.1 Antirust agent should be applied to the machined surface
4.9.2 The surface painting of butterfly valve should be in accordance with the provisions of JB106. 4.10 Cleanliness of inner cavity
The inner cavity of butterfly valve should be free of obvious dirt, and the allowable amount of impurities should comply with the provisions of JB/T7748. 5 Test and inspection methods
5.! The drive device inspection is carried out under no-load. In addition to being used for dynamic opening and closing, the product is used for 3 times of idleness with its driving force. The results should comply with the provisions of 4.6.1:
5.2 Shell test is in accordance with the provisions of 3.8.2 of ZBJ1600690, and the results should comply with the provisions of 4.3.1. 5.3 Sealing test
5.3.1 Install the regulating valve, gas meter, fan and the butterfly valve to be tested as shown in Figure 3, and seal all pipes and holes. 2
1- Gas storage tank; regulating valve; 3 Static pressure box · Valve to be tested 5· Gas meter Figure 3
Start the machine so that the wind pressure reaches the nominal pressure value of the butterfly valve. 5.3.2
Record the initial reading K measured by the gas meter and start timing. 5.3.4 Use the regulating valve to keep the test pressure stable for 10 minutes. 5.3.5
Record the final reading K measured by the gas meter:. The leakage rate of the butterfly valve to be tested is calculated according to formula (2): 5.3.6
5.3.7 The leakage rate of the butterfly valve to be tested shall comply with the provisions of 4.3.2. K. \-·K
5.4 Leakage and air tightness test
Start the fan and pressurize the butterfly valve to the test pressure value of 1.1 times the nominal pressure, maintain the pressure for 5 minutes, and check for leakage at the valve stem seal. The result should comply with the provisions of 4.3.3. 5.5 Coating inspection
The coating inspection adopts visual inspection, and the result should comply with the provisions of 4.9. 5.6 Inner cavity cleanliness inspection
JB/T8692-1998
The inner cavity cleanliness inspection is carried out according to the method of JB/I7748, and the result should comply with the provisions of 4.10. 6 Inspection rules
6.1 Factory inspection
6.1.1 Each butterfly valve must be inspected before delivery. 6.1.2 Factory inspection items shall be in accordance with the provisions of Table 4. 6.1.3 Technical requirements and test methods for factory inspection shall be in accordance with the provisions of Table 4. Table 4 Factory inspection and type inspection
Inspection items
Shell test
Tightness test
External leakage air tightness test
Drive device
Coating inspection
Inner cavity cleanliness
6.2 Type inspection
Inspection category
Freight inspection
Type inspection
6.2.1 Type inspection shall generally be carried out in any of the following situations: a) Trial production and identification of new products or old products transferred to factory production ; Technical requirements
According to the provisions of 4.3.1
According to the provisions of 1.3.2
According to the provisions of 4.3.3
According to the provisions of 4.6.1
According to the provisions of 4.9
According to the provisions of 4.10
b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) During normal production, a periodic inspection should be carried out regularly or after accumulating a certain amount of production; d) When the product is resumed after a long period of suspension of production; e) When the inspection results are significantly different from those of the last type inspection; f) When the national quality supervision agency requires type inspection. Test method
According to the provisions of 5.2
According to the provisions of 5.3
According to the provisions of .4
According to the provisions of 5.
According to the provisions of 5.5
According to the provisions of 5.6
6.2.2 Type inspection adopts the method of random sampling from the inventory butterfly valves that have been inspected and qualified by the quality inspection department of the manufacturer, or the method of random sampling from the butterfly valves that have been supplied to the user but have not been used. The minimum number of sampling and the number of sampling of each specification of butterfly valves shall be in accordance with the provisions of Table 5: When sampling by users, the number of sampling is not limited by Table 5, and the number of sampling is still in accordance with the provisions of Table 5. When the quality assessment of the entire series is carried out, the sampling department can select 2 to 3 typical specifications from the series for testing according to the situation. The minimum number of sampling and the total number of sampling of each specification shall still be in accordance with the provisions of Table 5.
Table 5 Sampling quantity of butterfly valves
Nominal diameter DV
6.2.3 Type inspection items Minimum number of units for sampling in accordance with the provisions of Table 4
Number of sampling units
6.2.4 The technical requirements and test methods for type inspection shall be in accordance with the provisions of Table 4. The shell test, sealing test, and leakage air tightness test of each butterfly valve to be inspected must all meet the requirements of the technical requirements in Table 4. For the remaining type inspection items, if the indicators of one of the butterfly valves to be inspected are lower than the requirements of the technical requirements in Table 4, it is allowed to re-sample the specified number of butterfly valves from the butterfly valves to be sampled. During the re-inspection: All inspection items must meet the requirements of the technical requirements in Table 4. Otherwise, it will be judged as unqualified. 7 Marking, packaging, transportation, storage, and supply 7.1 Marking
The marking of butterfly valves shall be in accordance with the provisions of GB12220.
2 Packaging, transportation, storage and supply
2-1998
JB/T8692
The packaging, transportation, storage and supply of butterfly valves shall comply with the provisions of JB/T7928. 5332 Factory inspection items shall be in accordance with the provisions of Table 4. 6.1.3 Technical requirements and test methods for factory inspection shall be in accordance with the provisions of Table 4. Table 4 Factory inspection and type inspection
Inspection items
Shell test
Tightness test
External leakage air tightness test
Drive device
Coating inspection
Inner cavity cleanliness
6.2 Type inspection
Inspection category
Factory inspection
Type inspection
6.2.1 In any of the following situations, type inspection should generally be carried out: a) Trial production and identification of new products or old products transferred to factory production; Technical requirements
According to the provisions of 4.3.1
According to the provisions of 1.3.2
According to the provisions of 4.3.3
According to the provisions of 4.6.1
According to the provisions of 4.9
According to the provisions of 4.10
b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) During normal production, a periodic inspection should be carried out regularly or after accumulating a certain amount of output; d) When the product is resumed after a long period of suspension of production; e) When the inspection results are significantly different from those of the last type inspection; f) When the national quality supervision agency requires type inspection. Test method
According to the provisions of 5.2
According to the provisions of 5.3
According to the provisions of .4
According to the provisions of 5.
According to the provisions of 5.5
According to the provisions of 5.6
6.2.2 Type inspection adopts the method of random sampling from the inventory butterfly valves that have been inspected and qualified by the quality inspection department of the manufacturer, or the method of random sampling from the butterfly valves that have been supplied to the user but have not been used. The minimum number of sampling and the number of sampling of each specification of butterfly valves shall be in accordance with the provisions of Table 5: When sampling by users, the number of sampling is not limited by Table 5, and the number of sampling is still in accordance with the provisions of Table 5. When the quality assessment of the entire series is carried out, the sampling department can select 2 to 3 typical specifications from the series for testing according to the situation. The minimum number of sampling and the total number of sampling of each specification shall still be in accordance with the provisions of Table 5.
Table 5 Sampling quantity of butterfly valves
Nominal diameter DV
6.2.3 Type inspection items Minimum number of units for sampling in accordance with the provisions of Table 4
Number of sampling units
6.2.4 The technical requirements and test methods for type inspection shall be in accordance with the provisions of Table 4. The shell test, sealing test, and leakage air tightness test of each butterfly valve to be inspected must all meet the requirements of the technical requirements in Table 4. For the remaining type inspection items, if the indicators of one of the butterfly valves to be inspected are lower than the requirements of the technical requirements in Table 4, it is allowed to re-sample the specified number of butterfly valves from the butterfly valves to be sampled. During the re-inspection: All inspection items must meet the requirements of the technical requirements in Table 4. Otherwise, it will be judged as unqualified. 7 Marking, packaging, transportation, storage, and supply 7.1 Marking
The marking of butterfly valves shall be in accordance with the provisions of GB12220.
2 Packaging, transportation, storage and supply
2-1998
JB/T8692
The packaging, transportation, storage and supply of butterfly valves shall comply with the provisions of JB/T7928. 5332 Factory inspection items shall be in accordance with the provisions of Table 4. 6.1.3 Technical requirements and test methods for factory inspection shall be in accordance with the provisions of Table 4. Table 4 Factory inspection and type inspection
Inspection items
Shell test
Tightness test
External leakage air tightness test
Drive device
Coating inspection
Inner cavity cleanliness
6.2 Type inspection
Inspection category
Factory inspection
Type inspection
6.2.1 In any of the following situations, type inspection should generally be carried out: a) Trial production and identification of new products or old products transferred to factory production; Technical requirements
According to the provisions of 4.3.1www.bzxz.net
According to the provisions of 1.3.2
According to the provisions of 4.3.3
According to the provisions of 4.6.1
According to the provisions of 4.9
According to the provisions of 4.10
b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) During normal production, a periodic inspection should be carried out regularly or after accumulating a certain amount of output; d) When the product is resumed after a long period of suspension of production; e) When the inspection results are significantly different from those of the last type inspection; f) When the national quality supervision agency requires type inspection. Test method
According to the provisions of 5.2
According to the provisions of 5.3
According to the provisions of .4
According to the provisions of 5.
According to the provisions of 5.5
According to the provisions of 5.6
6.2.2 Type inspection adopts the method of random sampling from the inventory butterfly valves that have been inspected and qualified by the quality inspection department of the manufacturer, or the method of random sampling from the butterfly valves that have been supplied to the user but have not been used. The minimum number of sampling and the number of sampling of each specification of butterfly valves shall be in accordance with the provisions of Table 5: When sampling by users, the number of sampling is not limited by Table 5, and the number of sampling is still in accordance with the provisions of Table 5. When the quality assessment of the entire series is carried out, the sampling department can select 2 to 3 typical specifications from the series for testing according to the situation. The minimum number of sampling and the total number of sampling of each specification shall still be in accordance with the provisions of Table 5.
Table 5 Sampling quantity of butterfly valves
Nominal diameter DV
6.2.3 Type inspection items Minimum number of units for sampling in accordance with the provisions of Table 4
Number of sampling units
6.2.4 The technical requirements and test methods for type inspection shall be in accordance with the provisions of Table 4. The shell test, sealing test, and leakage air tightness test of each butterfly valve to be inspected must all meet the requirements of the technical requirements in Table 4. For the remaining type inspection items, if the indicators of one of the butterfly valves to be inspected are lower than the requirements of the technical requirements in Table 4, it is allowed to re-sample the specified number of butterfly valves from the butterfly valves to be sampled. During the re-inspection: All inspection items must meet the requirements of the technical requirements in Table 4. Otherwise, it will be judged as unqualified. 7 Marking, packaging, transportation, storage, and supply 7.1 Marking
The marking of butterfly valves shall be in accordance with the provisions of GB12220.
2 Packaging, transportation, storage and supply
2-1998
JB/T8692
The packaging, transportation, storage and supply of butterfly valves shall comply with the provisions of JB/T7928. 533
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