Some standard content:
JB/T8527.--1997
Appendix A of this standard is a reminder appendix.
This standard was proposed and managed by the National Technical Committee for Valve Standardization. The drafting unit of this standard is Changsha Valve Factory.
The main drafters of this standard are Liu Pucheng, Liu Daquan, Xie Yuelong, Hu Ping, Ren Jie, Lei Yunqiu. 506
1 Scope
Mechanical Industry Standard of the People's Republic of China
Metal Sealed Butterfly Valve
JB/T 8527--1997
This standard specifies the definition, model and parameters, structural type, technical requirements, test methods, inspection rules, marking and supply requirements of metal sealed butterfly valves.
This standard is suitable for flanges and butt-connected metal sealed butterfly valves with nominal pressure PN0.05~5.00MPa and nominal diameter DN50~～4000mm.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB150-89 Steel pressure vessels
GB152.4-88 Countersunk holes for hexagonal bolts and hexagonal nuts for fasteners GB/T1047-1995 Nominal diameter of pipes and pipeline accessories GB1048-90 Nominal pressure of pipeline components
1996 Tolerances of shape and position without tolerance value GB/T 1184
GB9113.1~9113.26-88 Integral steel pipe flanges G39115.1~~9115.36:88 Butt-welded steel pipe flanges G139131--88 Steel pipe flanges Pressure-temperature grade general valve mark
GB 12220---89
GR12221 --89
Structural length of flange-connected metal valves
GB 12223---89
Connection of part-turn valve drive
GB12380.112380.4--90 Raised integral ductile iron pipe flange GB12386-90 Ductile iron pipe flange pressure-temperature grade GB/T13927:92 General valve pressure test G13/I＇15188.2-—94 Structural length of valves Fire-connected valves
JB308--75 Valve model compilation method
JB/T774895 Valve cleanliness and measurement method JB/T7928—95 General valve supply requirements 3 Definitions
This standard adopts the following definitions.
3.1 Metal Sealed Butterfly Valve
A butterfly valve whose sealing pair [i.e. the sealing surface of the valve body (also called the valve seat) and the sealing surface of the butterfly plate] is metal-to-metal. 3.2 One-way seal
It can only seal in the specified direction, i.e. the sealing direction marked on the butterfly valve. Approved by the Ministry of Machinery Industry of the People's Republic of China on April 15, 1997 and implemented on January 1, 1998
3.3 Bidirectional seal
JB/T8527--- 1997
It can seal in both the main sealing direction (positive direction) and the direction opposite to the main sealing direction (reverse direction) marked on the butterfly valve in both directions 4
Model and parameters
4.1 Model
The butterfly valve model shall comply with the provisions of JB308. However, for bidirectional sealed butterfly valves, a bidirectional seal code is added to the model, represented by the lowercase Chinese pinyin letter "s". Marked in the lower right corner of the type code. 4.2 Parameters
4.2.1 The nominal diameter of the butterfly valve shall comply with the provisions of GB/T1047. 4.2.2 The nominal pressure of the butterfly valve shall comply with the provisions of GB1048. 5 Structural type
The basic structure and main parts of the butterfly valve are shown in Figures 1 and 2. 5.1
1 Valve body; 2 Valve body sealing ring (valve seat): 3 Butterfly plate: 4 Valve stem: 5 Bushing: 6 Pressing ring: 7 Packing; 8 Packing gland; 9: Connecting seat: 10 Worm gear reducer; 11 Handwheel Figure 1 Wafer connection butterfly valve
JB/T 85271997
1 Valve body; 2- Valve body seal (valve seat), 3 Butterfly plate: 1 Valve stem: Pressure ring; 6- Shaft sleeve: 7-- Packing: 8 Packing gland: 9- Insulation connection seat: 10: Secondary drive device, 11-stage drive device, 2 Handwheel
Figure 2 Double flange connection butterfly valve
5.2 The structural type of butterfly valve can adopt vertical plate type, inclined plate type and stem type, etc. 5.3 The connection form of butterfly valve adopts wafer connection (as shown in Figure 3 and Figure 4), or double connection (as shown in Figure 5). Figure 3 Wafer connection
Figure 4 Other types of wafer connection
6 Technical requirements
6.1 Positive force-temperature grade
JB/T 8527
Figure 5 Double flange connection
The pressure-temperature grade of butterfly valve is determined by the pressure-temperature grade of valve body material. The materials of the butterfly plate, sealing pair and other internal parts should meet the working conditions of the valve.
6.1.1 The pressure-temperature grade of the ductile iron valve body material shall comply with the provisions of GB12386. 6.1.2 The pressure-temperature grade of the steel valve body shall comply with the provisions of GB9131. 6.1.3 The maximum applicable working temperature of the butterfly valve of this standard is 450C. The butterfly valve should be operated continuously at the indicated temperature and pressure. The minimum operating temperature should not be lower than -25C
6.2 The butterfly valve is suitable for the following use conditions:
a) Cut off and seal;
b) Adjust the flow within a certain range.
The maximum flow rate at the inlet of the butterfly valve shall not exceed the value in Table 1. 6.35
Nominal pressure P
Medium flow rate
0. 05 ~1. 0
1. 6~-5. (bzxZ.net
6.4 The butterfly valve body shall be marked with an arrow indicating the sealing direction or main sealing direction of the butterfly valve. For one-way sealing butterfly valves, the words "sealing direction" shall be marked on the upper part of the arrow; for two-way sealing butterfly valves, the words "main sealing direction" shall be marked on the upper part of the arrow. The arrow and words may be cast on the valve body or on the nameplate.
6.5 Valve body, butterfly plate and valve stem
6.5.1 Flange connection dimensions and sealing surface forms6.5.1.1 Ductile iron flange connection dimensions and sealing surface forms According to the provisions of GB12380.1~12380.4 6.5.1.2 Steel flange connection dimensions and sealing surface forms shall be in accordance with the provisions of GB9113.1~~9113.26 and GB9115.1~9115.36 6.5.1.3 For the steel flange connection dimensions and sealing surface forms with a nominal pressure less than 0.25MPa, the steel flange connection dimensions and sealing surface forms shall be in accordance with the provisions for the steel flange connection dimensions and sealing surface forms with a nominal pressure of (.25MPa. 6.5.2 Structural length
6.5.2 .1 The structural length of the double flange connection butterfly valve shall comply with the provisions of GB12221. 6.5.2.2
The structural length of the wafer connection butterfly valve shall comply with the provisions of GB/T15188.2. 6.5.2.3
Determine according to the requirements. The structural length of the butterfly valve with a nominal pressure greater than 4.0MPa or a nominal diameter greater than 2000mm may be determined according to the relevant standards or user requirements. 6.5.3
The flange sealing surfaces at both ends of the valve body shall be parallel to each other and perpendicular to the axis of the butterfly valve channel. The accuracy and bottle sound error shall be in accordance with the 12th grade accuracy specified in Table B3 of 510
JB/T8527--1997
GB/T1184-1996. 6.5.4 The bolt holes d of the flanges at both ends of the valve body are generally through holes. When they are blocked by the journal or rib plate, screw holes are allowed. 6.5.5 The position tolerance of the axis of the bolt holes d of the flanges at both ends of the valve body relative to the axis of the valve body (flange) is less than the tolerance specified in Table 2. Table 2
Diameter of flange bolt hole d.
11. 0~~17. 5
22.0～30.0
33, 0~48. 0
52.0-62.0
6.5.6 The minimum diameter of the valve seat shall not be less than the provisions of Table 3. Nominal diameter
Minimum diameter of the valve seat
Minimum wall thickness of the valve body can be calculated by referring to Appendix A (Suggested Appendix) Nominal diameter
Position tolerance
Minimum diameter of the valve seat
6.5.8 The valve body or butterfly plate can be cast as a whole or welded. Its welding process, post-weld heat treatment, non-destructive testing of welds and requirements for welders shall comply with the provisions of GB3150.
6.5.9 The back of the flange of the cast valve body shall be pierced according to the provisions of GB152.4. 6.5.10 For double flange-connected butterfly valves with a nominal diameter of not less than 600mm, appropriate reinforcing ribs shall be set on the valve to increase the strength of the body. For double flange connection butterfly valves with a nominal diameter of not less than 1000 mm, anchor supports and fixing bolts can be provided according to user needs.11 Seat and butterfly plate sealing surface
6.5.11.1 Materials that cannot meet the corresponding working temperature requirements are not allowed to be used in the valve seat or butterfly plate sealing surface. 6.5.11.2 The valve seat and butterfly plate sealing surface can be directly processed on the valve body or butterfly plate, also known as cladding other metal sealing materials. Or use integral metal sealing rings, metal elastic sealing rings, etc., JB/T 8527--1997
6.5.11.3 The valve seat, butterfly plate sealing ring and the valve body or butterfly plate can be connected by welding, expansion, embedded connection or bolt connection. 6.5.11.4 The thickness of the cladding layer of the cladding valve seat or butterfly plate sealing surface after processing should not be less than 2mm; the cladding or welding valve seat and butterfly plate sealing surface should be fully relieved after welding to ensure that there is no deformation and leakage during use. 6.5.12 The butterfly plate and valve stem should be designed to withstand a load of 1.5 times the maximum pressure difference (or nominal pressure) of the medium acting on the butterfly plate when the medium flows through the butterfly valve from any direction.
6.5.13 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.
6.5.14 The connection strength of the valve stem and the butterfly plate should be able to withstand the maximum torque transmitted by the valve stem. The connection part should be equipped with an anti-loosening structure to ensure that it does not loosen during use.
6.6 Bearings and stuffing box
6.6.1 Shaft sleeves or bearings should be set in the shaft seats at both ends of the valve body. When the butterfly valve is in use, the shaft sleeves or bearings should be able to withstand the maximum load transmitted by the valve stem, and the butterfly plate valve stem should rotate flexibly. 6.6.2 A thrust bearing or a thrust ball bearing shall be provided at the end of the valve stem to bear the axial thrust and control the axial movement of the butterfly plate. 6.6.3 A stuffing box shall be provided at the extended end of the valve stem to reliably prevent leakage of the medium from the valve stem. 6.7 Operation
6.7.1 The butterfly valve can be driven manually (including direct drive with a hand wheel or handle), gear drive, worm gear drive, pneumatic drive, hydraulic drive and electric drive.
6.7.2 The driving device shall ensure the normal operation of the butterfly valve under the conditions of the maximum allowable working pressure and the maximum flow rate (see Table 2). 6.7.3 When the working temperature of the butterfly valve is not less than 300C, insulation measures shall be taken between the driving device and the valve body to ensure the normal operation of the driving device.
6.7.4 The connection dimensions of the connecting flange between the driving device and the valve body or the connecting flange of the secondary driving device shall comply with the provisions of (3"2223). 6.7.5 When the wheel (including the handwheel of the driving device) or the handle is used to operate the butterfly valve (unless otherwise required by the user), it shall be designed to close the butterfly valve when it is turned in the clockwise direction.
6.7.6 The rim or core of the handwheel shall be provided with an arrow and the word "off" indicating the closing direction of the butterfly plate. The word "off" shall be placed at the front of the arrow; it may also be marked with arrows in the open and close directions and the words "open" and "off". 6.7.7 The butterfly valve driving device shall be provided with The opening indicator mechanism indicating the position of the butterfly plate and the limit mechanism of the butterfly plate in the fully open and fully closed positions. 6.7.8 For butterfly valves with a nominal diameter of not less than 1000mm, a finger block can be set in the valve body cavity to prevent the butterfly plate from exceeding the closed position and causing leakage.
6.8 Materials
6.8.1 The materials of the main parts of the butterfly valve should be selected according to the operating temperature, operating pressure and medium. The materials of the main parts are shown in Table 1 and are allowed to be selected by the designer. Other materials with mechanical properties not lower than those listed in the table. All materials shall comply with the requirements of the latest standards for corresponding materials. Table 4
Parts name
Valve body and butterfly plate
Ordinary carbon steel plate
1Low alloy structural steel plate
High quality carbon steel plate
Spheroidal cast iron
Stainless cast steel
Austenitic cast steel
20, 25
WCA, WCB,WEC
QT450-10.QT5007
ZG2Cr13,ZG ICr18Ni9T
CF8,CF8A1
Sealing surface or sealing ring of valve seat and butterfly plate
End cover, packing gland
Connecting pin
Bolt, nut
JB/T 8527--- 1997
Table 4 (continued)
Stainless steel
Chromium-nickel-titanium stainless steel
Stainless steel plate
Stainless steel pipe
Overlay stainless steel
Coal-chromium-tungsten alloy
Manganese alloy
Gray cast iron
Ductile cast iron
Ordinary carbon sodium
Low alloy structural steel plate| |tt||High-quality carbon steel
PTFE
5-5-5 tin bronze
9-2 aluminum bronze
40-2 manganese brass
9-1-4-2 aluminum bronze
High-quality carbon steel
Stainless steel
High-quality carbon steel
Alloy structural steel
Spring steel
Stainless steel wire
Shiti rubber sheet
Metal flat gasket
Copper (mild steel) coated graphite gasket
Steel belt asbestos spiral wound gasket
10r13,26r13,36r13
IGT17Ni2,1GT18NigT
10:13.20r13
IGr18Ni9Ti
Cr18Ni9Mog
ICrl8Nigr
IGr18Ni12M02T
EDCoCr-A,ELCUCr-B
FO-19-10Nh-16(A132)
FO-23-13-xx
TICotTI-X, TICoCr2-X | | tt | tt||ZCuA19Fe:Ni1Mn2
1Icr13,2('r13
23, 35
SterMo, u'rMo
1GrVA,30WiGr2VA
IGr 18NiG,ICr18NioTi
XB3200,X3350.XB3130
(cr13.ocr18Ni9
ICr18N9Ti
On wheel and handle
JB/T8527.-1997
Table 4 (end)
Flexible stone ladder packing
Fluoroethylene braided packing
Stone jade asbestos rope
Flexible graphite belt
Carbon red braided belt
Ductile cast
No Seam steel pipe
QT400-15.Q1450.10
WCA,WCB,WC
6.8.2 For the pressure-bearing parts of butterfly valves with a working temperature not less than 350℃ and a nominal diameter greater than 1500mm, ball cast iron should not be used. 7 Test method
Shell test shall be in accordance with the provisions of GB/T13927
7.2 Sealing test shall be in accordance with the provisions of GB/T13927, and the maximum allowable leakage shall be in accordance with the provisions of Table 5. The selection of leakage level according to the use requirements shall be indicated in the order contract. During the test, for one-way sealing butterfly valves, pressurize according to the sealing direction marked on the valve body: for two-way sealing butterfly valves, pressurize from both ends respectively. Table:
Test medium
0. 03 x TDN
Note: The table shows the leakage of one-way (forward) seal. When it is double-spaced seal, the reverse leakage should not exceed twice the forward leakage. 7.3 Shell material test shall comply with the provisions of 6.8 related valve body material standards, and 7.4 Cleanliness test shall comply with the provisions of JB/T7748. 8
Inspection rules
8.1 Factory inspection
Each valve must be inspected before delivery. The factory inspection items and technical requirements shall comply with the provisions of Table 6. Table 6
Inspection items
Pre-test
Seal test
Valve body material
Cleanliness
Output test
Type inspection
Technical requirements
According to the provisions of G137T13927
According to the provisions of GB/T13927 and 7.2
According to the provisions of 6.8 on valve body material standards
According to the provisions of JB/17748
8.2 Type inspection
JB/T8527---1997
8.2.1. Type inspection should be carried out in the following cases: a) new products or old products are tested for trial production and identification; b) after formal production, if there are major changes in structure, materials, and processes, which may affect product performance; c) during formal production, regular inspections should be carried out periodically or after a certain amount of production is accumulated; d) when the product is resumed after a long period of suspension; e) when there is a large difference between the factory inspection results and the type inspection results; f) when the national quality supervision agency proposes a requirement for type inspection. 8.2.2 Type inspection adopts the method of random sampling from the metal-sealed butterfly valves that have been inspected and qualified by the manufacturer or have been supplied to users but not used. The minimum number of valves for sampling and the number of sampling units for each specification shall be in accordance with the provisions of Table 7. When sampling by users, the number of sampling units is not limited by Table 7, and the number of sampling units shall be in accordance with the provisions of Table 7. When conducting quality assessment on the entire series, the sampling department may select 2-3 typical specifications from the series for testing according to the situation. The number of sampling units and the number of sampling units shall still be in accordance with the provisions of Table 7. Table 7
Nominal diameter
50~200
250~330
400~600
8.2.3 Type inspection items shall be in accordance with the provisions of Table 6. Minimum number of units for sampling
Number of sampling units
8.2.4 The technical requirements for type inspection are shown in Table 6. The shell test, seal test and shell material of each metal-sealed butterfly valve must all meet the technical requirements in Table 6. For the cleanliness inspection items, if the cleanliness index of one of the metal-sealed butterfly valves under inspection is lower than the technical requirements in Table 6, it is allowed to re-sample the specified number of metal-sealed butterfly valves. When re-inspecting, all inspection items must meet the technical requirements in Table 6, otherwise it will be judged as unqualified. 9 Marking
9.1 The leakage level of the butterfly valve (see Table 5) shall be marked on the product nameplate. 9.2 The sealing direction of the butterfly valve shall be marked on the valve body in accordance with the requirements of 6.4. 9.3 Other markings of the butterfly valve shall comply with the provisions of GB12220. 10 Supply
The supply requirements of butterfly valves shall comply with the provisions of IB/T7928. 516
Calculation formula for minimum wall thickness of ductile iron valve bodyMaterial: ductile iron
Nominal force: 0.252.5MPal
JB/T8527
Appendix A
(Suggested appendix)
Calculation of minimum wall thickness of valve body
Nominal diameter: 200~1500mm
Where: T
Minimum wall thickness of valve body.mm:
Maximum working pressure.MPa:
Water hammer pressure, p=0.55MPa
Allowable stress of material. The allowable stress of ductile iron is 91.8MPa: Nominal diameter of butterfly valve:
Additional margin.
Calculation formula for minimum wall thickness of steel valve body
Wu Zhong: (
(A1)
The additional margin due to factors such as total casting, welding deviation, processability and medium corrosion, C value can refer to Table A1 to select Table Al
>20~30
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