Some standard content:
Appendix 7 JB/T6441 Safety valve for compressors Machinery Industry Standard of the People's Republic of China
Safety valve for compressors
1 Subject content and scope of application
JB/T6441--92|| tt||This standard specifies the structure, performance, materials, testing and inspection, marking and supply requirements of safety valves for compressors. This standard applies to spring-loaded safety valves for compressors with nominal pressures not greater than 42MPa. 2 Reference standards
GB1239
GB5220
GB7306
GB9113
GB9440
GB12220
GB12224
GB12225
GB12227
GB12228
GB12229
CB12230
GB12241
GB12242
Ordinary cylindrical coil spring||tt| |Chromium vanadium spring steel wire for valves
Pipe threads sealed with threads
Integral steel pipe flange with ring connection surface
Male cast iron
Universal valve mark||tt ||Steel valves
Universal valves
Universal valves
Universal valves
Universal valves
Universal valves
General requirements||tt ||Technical conditions for copper alloy castings
Technical conditions for ductile iron castings
Technical conditions for carbon steel forgings
Technical conditions for carbon steel castings
Austenitic steel casting technology Conditions
General requirements for safety valves
Safety valve performance test specifications
GB/T12252
General valve supply requirements
GB12380||tt| |Raised surface integral ductile iron pipe flange
JB/T2769PN16.0~32.0MPa threaded flange 3 terms
The definitions of terms used in this standard are in accordance with the provisions of GB12241. 4Technical Requirements
4.1 Structural Requirements
4.1.1. General Requirements
Approved by the Ministry of Mechanical and Electronics Industry of the People's Republic of China 1992-07-20 166
1993-01- 01Implementation
4.1.1.1 In order to prevent the mechanism for adjusting the spring compression amount from loosening and arbitrarily changing the adjusted pressure, an anti-loosening device must be installed and sealed.
4.1.1.2 The design should ensure that the safety valve can still reach the rated displacement even if it is partially damaged. When the spring is damaged, the valve disc and other parts will not fly out of the valve body.
4.1.1.3 Full-open safety valves should be equipped with a mechanism to limit the opening height. 4.1.1.4 For safety valves with a wrench, the wrench can be used to lift the valve disc when the medium pressure reaches more than 75% of the opening pressure. The wrench should not obstruct the movement of the valve. 4.1.1.5 For safety valves with additional back pressure, a back pressure balancing mechanism should be set according to the size and fluctuation of the back pressure.
4.1.2 Connection forms
The connection forms of safety valves include flange connection, welding connection and threaded connection. 4.1.2.1 The connection form and size of the flange shall be in accordance with the provisions of GB9113 or GB12380. 4.1.2.2 The form and size of the welded end shall be in accordance with the provisions of GB12224, or in accordance with the ordering contract. 4.1.2.3 The thread form and size of threaded connections shall comply with the provisions of GB7306. 4.1.3 Limit deviation of structural length and verticality The structural length and verticality deviation shall be as specified in Figure 1 and Table 1. Figure 1
Table 1
Nominal diameter DN
mm
≤100
>100
4.1.4 Valve body|| tt||Structural length limit deviation, mm
AL
±1.5
±3.0
AL
±1.5
±3.0| |tt||Verticality limit deviation
4
±30
± 20
4.1.4.1 Valve body design should ensure that the safety valve operates under the shell test and working conditions No harmful deformation will occur and it is easy to manufacture and maintain.
4.1.4.2 The flange shall be cast or forged integrally with the valve body, and the flange may also be welded or threaded. The flange for welding connection should be of the butt welding type, and its welding requirements shall be in accordance with the provisions of GB12224, and the flange of threaded connection shall be in accordance with the provisions of GB9114 and JB/T2769.
167
4.1.5 Valve seat and valve disc
4.1.5.1 The sealing surface of the valve seat and valve disc is generally a flat or conical surface. 4.1.5.2 The thickness of the hardened layer after processing of the surfacing valve seat and valve disc sealing surface should be greater than or equal to 2 mmg. 4.1.5.3 The valve seat and valve body can be made into one piece or divided into two pieces. A two-piece valve The seat should be firmly fixed on the valve body. || tt | The support plane of the ring, the end of the support ring should be tight with the working ring, and the deviation of the spring axis from the verticality of the support planes at both ends should not be greater than 1.7mm per 100mm length. 6.1.6.3 The spring index (ratio of pitch diameter and steel wire diameter) should be selected within the range of 4 to 8 as much as possible. The limit deviation of spring free height is as specified in Table 2. 6.1.6.4
Table 2
free height
H
limit deviation
20
±1.2
>20 ~60
±1.5
0|>200~300|>300~450
>450~600
>60~120
>120 ~200
±2.5
±3.5
±4.5
±7.0
±9.0
According to the design needs, the free height is allowed Specifies the deviation of asymmetric distribution, but its deviation value should comply with the provisions of Table 2. 4.1.6.5 The limit deviation of spring inner diameter is as specified in Table 3. Table 3
Inner diameter D
Limit deviation
N40
±0.6
o
.>40 ~ 60
±0.8
0
>60 ~80
±1.0
0
>80~100
±1.2||tt| |0
>100 ~150
±1.5
0
mm
>600
±1.5%H||tt| |mm
>150
±1% D,
0
4.1.6.6 The limit deviation of the working circle spacing of the spring in the free state is ±10 of the working circle spacing value % (if less than 0.4mm, take 0.4mm).
4.1.6.7 The spring should be subjected to strong pressure treatment. Or it can be heated and pressed according to the requirements of the design or order contract; the limit deviation of the deformation or stiffness of the spring is ±10% of the design value. According to the design needs, the deviation value can also be asymmetrically divided. 4.1.6.8 The spring shall not have defects such as cracks, oxide scale, rust, etc. 4.1.6.9 Spring should be treated with anti-rust treatment.
4.1.6.10 The calculation formula of the spring and the allowable stress of the material are in accordance with the provisions of GB1239. 1 The deformation amount of the spring under the minimum working load is calculated according to formula (1): 4.1.6.11
F1=yuan DPs1/4p2
In the formula: F, the deformation amount of a spring under the minimum working load, mmDm2 - Average diameter of sealing surface, mm;
Ps1 - Designed minimum set pressure, MPa; Pl spring stiffness. N/mm.
4.1.6.12 The deformation amount of the spring under the maximum working load is calculated according to formula (2): F2=(yuan D2Ps2/4Pl)+h *
In the formula: F2 - the spring under the maximum working load Deformation, mm; 168
(1)
(2)
Ps - the designed maximum set pressure, MPa; h - the designed opening height. mm
4.1.6.13 The deformation amount of the spring under the maximum working load should be less than or equal to 80% of the deformation amount when the spring rings are tightened. 4.1.6.14. The shear stress at the maximum working load of the spring should be less than or equal to 80% of the working limit shear stress. 4.2 Performance requirements
4.2.1 The limit deviation of the set pressure is as specified in Table 4. Table 4
Set pressure
Limit deviation
>0.5
±0.014
4.2.2 Discharge pressure should be less than or equal to 1.10 times of the set pressure. 4.2.3 The opening and closing pressure difference shall be as specified in Table 5.
Table 5
Set pressure
Metal sealing surface
≤0.2
>0.2
4.2.4 Opening height and its limit deviation
≤0.03
≤15% set pressure
opening and closing pressure difference
≥0.5
MPa
±3% set pressure| |tt||MPa
Soft sealing surface
≤0.05
≤25% set pressure
Before the medium pressure rises to the rated discharge pressure, the opening height of the safety valve should Reaching the specified value in Table 6, the limit deviation of the opening height of the full-lift safety valve is ±5% of the average value. Table 6
Type
Type
Opening height
Full opening type
≥1/4 flow channel diameter
Micro opening type| |tt||≥1/20 flow channel diameter or ≥1/40 flow channel diameter, and comply with the design regulations 4.2.5 Mechanical Characteristics
The action of the safety valve must be stable and reliable, without frequency jump, frontal vibration, Jamming and other phenomena. 4.2.6 Sealing performance
4.2.6.1 The sealing test pressure shall be as specified in Table 7. Table 7
Set pressure
Sealing test pressure
<0.3
Set pressure-0.03
4.2.6.2 The medium for sealing test is air. 4.2.6.3 Sealing requirements
The maximum allowable leakage rate of the sealing test is as specified in Table 8. 169
≥0.3
90% set pressure
MPa
Flow channel diameter
mm
≤20
> 20
Table 8
Maximum allowable leakage rate, number of bubbles/min
Nominal pressure PN, MPa
<10
40
20
4.2.7 Displacement
The displacement of the safety valve should be calculated according to the regulations of GB12241. 4.3 Material requirements
≥10
60
30
4.3.1 Valve body
The material of steel valve body should be in accordance with GB12228, GB12229, GB12230 regulations; the material of the iron valve body should comply with the regulations of CB9440 and GB12227; the material of the copper alloy valve body should comply with the regulations of GB12225. The applicable pressure limits for valve body materials are as specified in Table 9. Table 9
Nominal diameter DN, mm
Material
Material
Male cast iron
Nodular cast iron
Copper alloy
Cast
Forged
Steel
Steel
32
1.6
2.5
Applicable pressure limit, MPa||tt ||16
42
Valve seat and valve disc
4.3.2
The corrosion resistance of the valve seat and valve disc body materials should not be lower than that of the valve body material . 4.3.3 Guide sleeve
The material of the guide sleeve should have good wear resistance and corrosion resistance. 4.3.4 Spring
The spring material shall comply with the provisions of GB5220.
5 test
5.1 test items
>32
1.6
Safety valve type test items for this test and factory test are in accordance with Table 10. Type tests should be carried out when newly designed or changed products are finalized, and factory tests should be carried out before each product leaves the factory. 170
5.2
1
2
3
4
5
6
7| |tt||8
General requirements
5.2.1
5.2.2
Bright body
Tightness
Set pressure| |tt||Discharge pressure or exceed pressure
Reseat pressure or opening and closing pressure difference
Opening height
Mechanical characteristics
Displacement or displacement coefficient||tt ||Factory testing should be carried out before painting.
Table 10
V
V
V
V
V
V
Test equipment And instruments should comply with the regulations of CB12241 and GB12242. Safety requirements during testing should be in accordance with GB12241. 5.2.3
V
V
V
5.2.4 The set pressure test before leaving the factory shall be carried out according to the designed maximum and minimum set pressure or according to the provisions of the order contract . The number of tests shall be no less than 2 times. It should be adjusted to the setting pressure specified in the ordering contract before leaving the factory. If the contract does not specify it, it should be adjusted to the designed minimum set pressure. 5.3 Test methods and requirements
5.3.1 Shell test.
5.3.1.1 The shell test shall be in accordance with the provisions of GB12241. 5.3.1.2 No leakage or structural damage is allowed during the shell test. 5.3.2 Sealing test
The sealing test shall be in accordance with the provisions of Article 4.2.6 of this standard and GB12242. 5.3.3 Action performance and displacement test
Set pressure, discharge pressure or excess pressure, return pressure or closing and opening pressure difference, opening height, mechanical characteristics and other action performance tests and displacement or displacement coefficient test press The regulations of GB12241 and CB12242. 6 Marking
6.1 The general marking of safety valves shall be in accordance with the provisions of GB12220. 6.2 The following content should be included on the sign:
Manufacturer’s name or trademark;
a.
b. Date of manufacture;
Product name, model, manufacturing number and production license number; c.
Nominal diameter;
d.
e.||tt| |Nominal pressure;
f.
Flow channel diameter;
g
Set pressure;
171
h.||tt ||i.
j.
k.
7
Discharge pressure;
Opening and closing pressure difference or return pressure; ||tt| |Opening height;
Applicable temperature;
Rated displacement or rated displacement coefficient.
Supply requirements
The supply of safety valves shall comply with the provisions of GB/T12252. 7.1
7.2
Each product shall have a product certificate. In addition to the contents in Article 6.2, the certificate shall also include the following contents:
a.
b.
c.
Standards based on;
Inspection conclusion and inspection date;
Signature of the person in charge of inspection and inspection personnel;|| tt||Official seal of the inspection department of the manufacturer.
d.
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry and others. The main drafters of this standard are Qiu Xiaolai and Yang Sixiang. The main standard refers to JISB8210-1986 "Spring Safety Valve for Steam and Gas". 172
05
≤25% set pressure
Before the medium pressure rises to the rated discharge pressure, the opening height of the safety valve should reach the specified value in Table 6. The limit deviation of the opening height of the full-lift safety valve is the average value. ±5%. Table 6
Type
Type
Opening height
Full opening type
≥1/4 flow channel diameter
Micro opening type| |tt||≥1/20 flow channel diameter or ≥1/40 flow channel diameter, and comply with the design regulations 4.2.5 Mechanical Characteristics
The action of the safety valve must be stable and reliable, without frequency jump, frontal vibration, Jamming and other phenomena. 4.2.6 Sealing performance
4.2.6.1 The sealing test pressure shall be as specified in Table 7. Table 7
Set pressure
Sealing test pressure
<0.3
Set pressure-0.03
4.2.6.2 The medium for sealing test is air. 4.2.6.3 Sealing requirements
The maximum allowable leakage rate of the sealing test is as specified in Table 8. 169
≥0.3
90% set pressure
MPa
Flow channel diameter
mm
≤20
> 20
Table 8
Maximum allowable leakage rate, number of bubbles/min
Nominal pressure PN, MPa
<10
40
20
4.2.7 Displacement
The displacement of the safety valve should be calculated according to the regulations of GB12241. 4.3 Material requirements
≥10
60
30
4.3.1 Valve body
The material of steel valve body should be in accordance with GB12228, GB12229, GB12230 regulations; the material of the iron valve body should comply with the regulations of CB9440 and GB12227; the material of the copper alloy valve body should comply with the regulations of GB12225. The applicable pressure limits for valve body materials are as specified in Table 9. Table 9
Nominal diameter DN, mm
Material
Material
Male cast iron
Nodular cast iron
Copper alloy
Cast
Forged
Steel
Steel
32
1.6
2.5
Applicable pressure limit, MPa||tt ||16
42
Valve seat and valve disc
4.3.2
The corrosion resistance of the valve seat and valve disc body materials should not be lower than that of the valve body material . 4.3.3 Guide sleeve
The material of the guide sleeve should have good wear resistance and corrosion resistance. 4.3.4 Spring
The spring material shall comply with the provisions of GB5220.
5 test
5.1 test items
>32
1.6
Safety valve type test items for this test and factory test are in accordance with Table 10. Type tests should be carried out when newly designed or changed products are finalized, and factory tests should be carried out before each product leaves the factory. 170
5.2
1
2
3
4
5
6
7| |tt||8
General requirements
5.2.1
5.2.2
Bright body
Tightness
Set pressure| |tt||Discharge pressure or exceed pressure
Reseat pressure or opening and closing pressure difference
Opening height
Mechanical characteristics
Displacement or displacement coefficient||tt ||Factory testing should be carried out before painting.
Table 10
V
V
V
V
V
V
Test equipment And instruments should comply with the regulations of CB12241 and GB12242. Safety requirements during testing should be in accordance with GB12241. 5.2.3
V
V
V
5.2.4 The set pressure test before leaving the factory shall be carried out according to the designed maximum and minimum set pressure or according to the provisions of the order contract . The number of tests shall be no less than 2 times. It should be adjusted to the setting pressure specified in the ordering contract before leaving the factory. If the contract does not specify it, it should be adjusted to the designed minimum set pressure. 5.3 Test methods and requirements
5.3.1 Shell test.
5.3.1.1 The shell test shall be in accordance with the provisions of GB12241. 5.3.1.2 No leakage or structural damage is allowed during the shell test. 5.3.2 Sealing test
The sealing test shall be in accordance with the provisions of Article 4.2.6 of this standard and GB12242. 5.3.3 Action performance and displacement test
Set pressure, discharge pressure or excess pressure, return pressure or closing and opening pressure difference, opening height, mechanical characteristics and other action performance tests and displacement or displacement coefficient test press The regulations of GB12241 and CB12242. 6 Marking
6.1 The general marking of safety valves shall be in accordance with the provisions of GB12220. 6.2 The following content should be included on the sign:
Manufacturer’s name or trademark;
a.
b. Date of manufacture;
Product name, model, manufacturing number and production license number; c.
Nominal diameter;
d.
e.||tt| |Nominal pressure;
f.
Flow channel diameter;
g
Set pressure;
171
h.||tt ||i.
j.
k.
7
Discharge pressure;
Opening and closing pressure difference or return pressure; ||tt| |Opening height;
Applicable temperature;
Rated displacement or rated displacement coefficient.
Supply requirements
The supply of safety valves shall comply with the provisions of GB/T12252. 7.1
7.2
Each product shall have a product certificate. In addition to the contents in Article 6.2, the certificate shall also include the following contents:
a.
b.
c.
Standards based on;
Inspection conclusion and inspection date;
Signature of the person in charge of inspection and inspection personnel;|| tt||Official seal of the inspection department of the manufacturer.
d.
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry and others. The main drafters of this standard are Qiu Xiaolai and Yang Sixiang. The main standard refers to JISB8210-1986 "Spring Safety Valve for Steam and Gas". 172
05
≤25% set pressure
Before the medium pressure rises to the rated discharge pressure, the opening height of the safety valve should reach the specified value in Table 6. The limit deviation of the opening height of the full-lift safety valve is the average value. ±5%. Table 6
Type
Type
Opening height
Full opening type
≥1/4 flow channel diameter
Micro opening type| |tt||≥1/20 flow channel diameter or ≥1/40 flow channel diameter, and comply with the design regulations 4.2.5 Mechanical Characteristics
The action of the safety valve must be stable and reliable, without frequency jump, frontal vibration, Jamming and other phenomena. 4.2.6 Sealing performance
4.2.6.1 The sealing test pressure shall be as specified in Table 7. Table 7
Set pressure
Sealing test pressure
<0.3
Set pressure-0.03
4.2.6.2 The medium for sealing test is air. 4.2.6.3 Sealing requirements
The maximum allowable leakage rate of the sealing test is as specified in Table 8. 169
≥0.3
90% set pressure
MPa
Flow channel diameter
mm
≤20
> 20
Table 8
Maximum allowable leakage rate, number of bubbles/min
Nominal pressure PN, MPa
<10
40
20
4.2.7 Displacement
The displacement of the safety valve should be calculated according to the regulations of GB12241. 4.3 Material requirements
≥10
60
30
4.3.1 Valve body
The material of steel valve body should be in accordance with GB12228, GB12229, GB12230 regulations; the material of the iron valve body should comply with the regulations of CB9440 and GB12227; the material of the copper alloy valve body should comply with the regulations of GB12225. The applicable pressure limits for valve body materials are as specified in Table 9. Table 9
Nominal diameter DN, mm
Material
Material
Male cast iron
Nodular cast iron
Copper alloy
Cast
Forged
Steel
Steel
32
1.6
2.5
Applicable pressure limit, MPa||tt ||16
42
Valve seat and valve disc
4.3.2
The corrosion resistance of the valve seat and valve disc body materials should not be lower than that of the valve body material . 4.3.3 Guide sleeve
The material of the guide sleeve should have good wear resistance and corrosion resistance. 4.3.4 Spring
The spring material shall comply with the provisions of GB5220.
5 test
5.1 test items
>32
1.6
Safety valve type test items for this test and factory test are in accordance with Table 10. Type tests should be carried out when newly designed or changed products are finalized, and factory tests should be carried out before each product leaves the factory. 170
5.2
1
2
3
4
5
6
7| |tt||8
General requirements
5.2.1
5.2.2
Bright body
Tightness
Set pressure| |tt||Discharge pressure or exceed pressure
Reseat pressure or opening and closing pressure difference
Opening height
Mechanical characteristics
Displacement or displacement coefficient||tt ||Factory testing should be carried out before painting.
Table 10
V
V
V
V
V
V
Test equipment And instruments should comply with the regulations of CB12241 and GB12242. Safety requirements during testing should be in accordance with GB12241. 5.2.3
VwwW.bzxz.Net
V
V
5.2.4 The set pressure test before leaving the factory shall be carried out according to the designed maximum and minimum set pressure or according to the provisions of the order contract . The number of tests shall be no less than 2 times. It should be adjusted to the setting pressure specified in the ordering contract before leaving the factory. If the contract does not specify it, it should be adjusted to the designed minimum set pressure. 5.3 Test methods and requirements
5.3.1 Shell test.
5.3.1.1 The shell test shall be in accordance with the provisions of GB12241. 5.3.1.2 No leakage or structural damage is allowed during the shell test. 5.3.2 Sealing test
The sealing test shall be in accordance with the provisions of Article 4.2.6 of this standard and GB12242. 5.3.3 Action performance and displacement test
Set pressure, discharge pressure or excess pressure, return pressure or closing and opening pressure difference, opening height, mechanical characteristics and other action performance tests and displacement or displacement coefficient test press The regulations of GB12241 and CB12242. 6 Marking
6.1 The general marking of safety valves shall be in accordance with the provisions of GB12220. 6.2 The following content should be included on the sign:
manufacturer’s name or trademark;
a.
b. Date of manufacture;
Product name, model, manufacturing number and production license number; c.
Nominal diameter;
d.
e.||tt| |Nominal pressure;
f.
Flow channel diameter;
g
Set pressure;
171
h.||tt ||i.
j.
k.
7
Discharge pressure;
Opening and closing pressure difference or return pressure; ||tt| |Opening height;
Applicable temperature;
Rated displacement or rated displacement coefficient.
Supply requirements
The supply of safety valves shall comply with the provisions of GB/T12252. 7.1
7.2
Each product shall have a product certificate. In addition to the contents in Article 6.2, the certificate shall also include the following contents:
a.
b.
c.
Standards based on;
Inspection conclusion and inspection date;
Signature of the person in charge of inspection and inspection personnel;|| tt||Official seal of the inspection department of the manufacturer.
d.
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry and others. The main drafters of this standard are Qiu Xiaolai and Yang Sixiang. The main standard refers to JISB8210-1986 "Spring Safety Valve for Steam and Gas". 172
1 Valve body
The material of the steel valve body should be in accordance with the regulations of GB12228, GB12229, and GB12230; the material of the iron valve body should be in accordance with the regulations of CB9440 and GB12227; the material of the copper alloy valve body should be in accordance with the regulations of GB12225. The applicable pressure limits for valve body materials are as specified in Table 9. Table 9
Nominal diameter DN, mm
Material
Material
Male cast iron
Nodular cast iron
Copper alloy
Cast
Forged
Steel
Steel
32
1.6
2.5
Applicable pressure limit, MPa||tt ||16
42
Valve seat and valve disc
4.3.2
The corrosion resistance of the valve seat and valve disc body materials should not be lower than that of the valve body material . 4.3.3 Guide sleeve
The material of the guide sleeve should have good wear resistance and corrosion resistance. 4.3.4 Spring
The spring material shall comply with the provisions of GB5220.
5 test
5.1 test items
>32
1.6
Safety valve type test items for this test and factory test are in accordance with Table 10. Type tests should be carried out when newly designed or changed products are finalized, and factory tests should be carried out before each product leaves the factory. 170
5.2
1
2
3
4
5
6
7| |tt||8
General requirements
5.2.1
5.2.2
Bright body
Tightness
Set pressure| |tt||Discharge pressure or exceed pressure
Reseat pressure or opening and closing pressure difference
Opening height
Mechanical characteristics
Displacement or displacement coefficient||tt ||Factory testing should be carried out before painting.
Table 10
V
V
V
V
V
V
Test equipment And instruments should comply with the regulations of CB12241 and GB12242. Safety requirements during testing should be in accordance with GB12241. 5.2.3
V
V
V
5.2.4 The set pressure test before leaving the factory shall be carried out according to the designed maximum and minimum set pressure or according to the provisions of the order contract . The number of tests shall be no less than 2 times. It should be adjusted to the setting pressure specified in the ordering contract before leaving the factory. If the contract does not specify it, it should be adjusted to the designed minimum set pressure. 5.3 Test methods and requirements
5.3.1 Shell test.
5.3.1.1 The shell test shall be in accordance with the provisions of GB12241. 5.3.1.2 No leakage or structural damage is allowed during the shell test. 5.3.2 Sealing test
The sealing test shall be in accordance with the provisions of Article 4.2.6 of this standard and GB12242. 5.3.3 Action performance and displacement test
Set pressure, discharge pressure or excess pressure, return pressure or closing pressure difference, opening height, mechanical characteristics and other action performance tests and displacement or displacement coefficient test press The regulations of GB12241 and CB12242. 6 Marking
6.1 The general marking of safety valves shall be in accordance with the provisions of GB12220. 6.2 The following content should be included on the sign:
Manufacturer’s name or trademark;
a.
b. Date of manufacture;
Product name, model, manufacturing number and production license number; c.
Nominal diameter;
d.
e.||tt| |Nominal pressure;
f.
Flow channel diameter;
g
Set pressure;
171
h.||tt ||i.
j.
k.
7
Discharge pressure;
Opening and closing pressure difference or return pressure; ||tt| |Opening height;
Applicable temperature;
Rated displacement or rated displacement coefficient.
Supply requirements
The supply of safety valves shall comply with the provisions of GB/T12252. 7.1
7.2
Each product shall have a product certificate. In addition to the contents in Article 6.2, the certificate shall also include the following contents:
a.
b.
c.
Standards based on;
Inspection conclusion and inspection date;
Signature of the person in charge of inspection and inspection personnel;|| tt||Official seal of the inspection department of the manufacturer.
d.
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry and others. The main drafters of this standard are Qiu Xiaolai and Yang Sixiang. The main standard refers to JISB8210-1986 "Spring Safety Valve for Steam and Gas". 172
1 Valve body
The material of the steel valve body should be in accordance with the regulations of GB12228, GB12229, and GB12230; the material of the iron valve body should be in accordance with the regulations of CB9440 and GB12227; the material of the copper alloy valve body should be in accordance with the regulations of GB12225. The applicable pressure limits for valve body materials are as specified in Table 9. Table 9
Nominal diameter DN, mm
Material
Material
Male cast iron
Nodular cast iron
Copper alloy
Cast
Forged
Steel
Steel
32
1.6
2.5
Applicable pressure limit, MPa||tt ||16
42
Valve seat and valve disc
4.3.2
The corrosion resistance of the valve seat and valve disc body materials should not be lower than that of the valve body material . 4.3.3 Guide sleeve
The material of the guide sleeve should have good wear resistance and corrosion resistance. 4.3.4 Spring
The spring material shall comply with the provisions of GB5220.
5 test
5.1 test items
>32
1.6
Safety valve type test items for this test and factory test are in accordance with Table 10. Type tests should be carried out when newly designed or changed products are finalized, and factory tests should be carried out before each product leaves the factory. 170
5.2
1
2
3
4
5
6
7| |tt||8
General requirements
5.2.1
5.2.2
Bright body
Tightness
Set pressure| |tt||Discharge pressure or exceed pressure
Reseat pressure or opening and closing pressure difference
Opening height
Mechanical characteristics
Displacement or displacement coefficient||tt ||Factory testing should be carried out before painting.
Table 10
V
V
V
V
V
V
Test equipment And instruments should comply with the regulations of CB12241 and GB12242. Safety requirements during testing should be in accordance with GB12241. 5.2.3
V
V
V
5.2.4 The set pressure test before leaving the factory shall be carried out according to the designed maximum and minimum set pressure or according to the provisions of the order contract . The number of tests shall be no less than 2 times. It should be adjusted to the setting pressure specified in the ordering contract before leaving the factory. If the contract does not specify it, it should be adjusted to the designed minimum set pressure. 5.3 Test methods and requirements
5.3.1 Shell test.
5.3.1.1 The shell test shall be in accordance with the provisions of GB12241. 5.3.1.2 No leakage or structural damage is allowed during the shell test. 5.3.2 Sealing test
The sealing test shall be in accordance with the provisions of Article 4.2.6 of this standard and GB12242. 5.3.3 Action performance and displacement test
Set pressure, discharge pressure or excess pressure, return pressure or closing and opening pressure difference, opening height, mechanical characteristics and other action performance tests and displacement or displacement coefficient test press The regulations of GB12241 and CB12242. 6 Marking
6.1 The general marking of safety valves shall be in accordance with the provisions of GB12220. 6.2 The following content should be included on the sign:
Manufacturer’s name or trademark;
a.
b. Date of manufacture;
Product name, model, manufacturing number and production license number; c.
Nominal diameter;
d.
e.||tt| |Nominal pressure;
f.
Flow channel diameter;
g
Set pressure;
171
h.||tt ||i.
j.
k.
7
Discharge pressure;
Opening and closing pressure difference or return pressure; ||tt| |Opening height;
Applicable temperature;
Rated displacement or rated displacement coefficient.
Supply requirements
The supply of safety valves shall comply with the provisions of GB/T12252. 7.1
7.2
Each product shall have a product certificate. In addition to the contents in Article 6.2, the certificate shall also include the following contents:
a.
b.
c.
Standards based on;
Inspection conclusion and inspection date;
Signature of the person in charge of inspection and inspection personnel;|| tt||Official seal of the inspection department of the manufacturer.
d.
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry and others. The main drafters of this standard are Qiu Xiaolai and Yang Sixiang. The main standard refers to JISB8210-1986 "Spring Safety Valve for Steam and Gas". 172
Flow channel diameter;
g
Set pressure;
171
h.
i.
j.
k.
7
Discharge pressure;
Opening and closing pressure difference or return pressure;
Opening height;
Applicable temperature ;
Rated displacement or rated displacement coefficient.
Supply requirements
The supply of safety valves shall comply with the provisions of GB/T12252. 7.1
7.2
Each product shall have a product certificate. In addition to the contents in Article 6.2, the certificate shall also include the following contents:
a.
b.
c.
Standards based on;
Inspection conclusion and inspection date;
Signature of the person in charge of inspection and inspection personnel;|| tt||Official seal of the inspection department of the manufacturer.
d.
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry and others. The main drafters of this standard are Qiu Xiaolai and Yang Sixiang. The main standard refers to JISB8210-1986 "Spring Safety Valve for Steam and Gas". 172
Flow channel diameter;
g
Set pressure;
171
h.
i.
j.
k.
7
Discharge pressure;
Opening and closing pressure difference or return pressure;
Opening height;
Applicable temperature ;
Rated displacement or rated displacement coefficient.
Supply requirements
The supply of safety valves shall comply with the provisions of GB/T12252. 7.1
7.2
Each product shall have a product certificate. In addition to the contents in Article 6.2, the certificate shall also include the following contents:
a.
b.
c.
Standards based on;
Inspection conclusion and inspection date;
Signature of the person in charge of inspection and inspection personnel;|| tt||Official seal of the inspection department of the manufacturer.
d.
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronic Industry and others. The main drafters of this standard are Qiu Xiaolai and Yang Sixiang. The main standard refers to JISB8210-1986 "Spring Safety Valve for Steam and Gas". 172
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