Some standard content:
ICS 47.020.30
Registration No.: 11141-2003
Ship Industry Standard of the People's Republic of China
CB/T3943--2002
Flanged stainless steel stop check valves
Stainless steel flanged stop check valves2002 11 20 Issued by
Issued by the Commission of Science, Technology and Industry for National Defense
Implementation on February 1, 2003
CB/T3943-2002
This standard specifies the type A and type B stainless steel stop check valves. Their connection dimensions and sealing surfaces are consistent with those in GB/T569-1965 "Marine flange connection dimensions and sealing surfaces". Their structural lengths are consistent with those in GB/1584-1999 "Marine flange cast steel stop valves". The AS and BS stainless steel stop check valves specified in this standard have flange connection dimensions and sealing surfaces consistent with those in GB/T2301-1989 "Marine flange connection dimensions and sealing surfaces (four-digit)", and their structural lengths are consistent with those in GB/T11698-1989 "Marine flange connection dimensions and sealing surfaces". This standard is proposed by China Shipbuilding Industry Corporation, and this standard is under the jurisdiction of China Shipbuilding Industry Comprehensive Technology and Economic Research Institute. This standard is initiated by China Shipbuilding Industry Comprehensive Technology and Economic Research Institute, Huiyin Marine Valve Co., Ltd., Dalian New Ship Heavy Industry Co., Ltd.,
This standard is drafted by Luo Fayuan, Cha Yuchu, Gu Huiping, Liu Daxiang, Qiu Jinquan, 1 Fan circle
Flanged stainless steel check valve
CB/T3943--2002
This standard specifies the classification, requirements, test methods, inspection rules, marking and packaging of flange stainless steel check valves with thread connection dimensions according to GT3/T569, (/T2.501 (hereinafter referred to as the main stop), this standard is used for nominal pressure not higher than 6.4MPa, and the filterability is not lower than -[65℃ Design, manufacture and acceptance of stop-return systems for liquefied gas carriers, bulk chemical carriers and ships. The stop-return systems for corrosive media on other ships may be adopted for reference.
2 Referenced documents
The clauses in the following documents become clauses of this standard through the reference of this standard. For any referenced document with a date, all subsequent amendments (excluding dated contents) or revisions are not applicable to this standard. However, all parties who reach an agreement and read the design based on this standard are encouraged to study whether the latest versions of these documents can be used. For any referenced document with an illegal date, its latest version shall apply to this standard. GB/T569—1965 General flange connection dimensions and tightness GB/T 600—E991
General technical conditions for ship pipeline valves
GB/T1220—1992 Stainless steel bars
GB/T2100—1980 Technical conditions for small rust and acid-resistant steel castings GB/T2501—1989
Ship flange connection size small rental inspection cover (concave position) GR/T3032 Marking of ship inspection parts
China Classification Society
1998
3 Classification
3.1 Type
《Material "Materials and Welding Specifications"
The types of stop valves are as follows:
Type A flange connection dimensions and sealing surfaces shall comply with B/569·15 straight stop valve: Type B--: The connection dimensions and sealing surfaces shall comply with GB/1669-1%65 right-angle stop valve: Type S--: The connection dimensions and sealing surfaces shall comply with B/T2501-1589 straight stop valve: Type S--: The flange connection dimensions and sealing surfaces shall comply with GB/T2501-1989 and Type C stop valve: Type CB/T 3943-2002
3.2 Basic parameters
Basic parameters of stop check valve are shown in Table 1
Nominal pressure
S, BS
3.3 Structure and basic dimensions
Basic parameters of stop check valve
TWorking temperature,
Maximum allowable working pressure, MPa
Distance diameter
65-150
125, 150
20~150
65--100
20--50
15~300
100--300
_5-300
3. 3. 1 PW is 1. 0, 1. 6 and 2. 6 The structure and basic dimensions of type 1 and type R stop check valves with PN of 1.0, 1.6 and 2.5 MPa are shown in Figure 1, Figure 2 and Table 2. Unit: meter
Taiwan month flat hand wheel
Rate 1 Type A, type AS (P≤2.5IPa)
Figure 2 Type B, type BS (PN≤2.5MPa) Nominal pressure
CB/T 39432002
Table 2 Basic dimensions of type A and type B stop check valves with PN of 1.0, 1.6 and 2.5MPa are shown in meters
Structural dimensions!
Type A Type B Type A
500200556484
270226
[32027
Weight kg
46.3 36.9
17.617.8
49.2142.9
3.3.2 The structure and basic dimensions of Type A and Type B stop valves with PY of 4.0 and 6.4 MPa shall be as shown in Figure 3 and Table 3. Unit: mm
Allowable flat hand wheel
Figure 3 Type A, AS (PN ≥ 4.0 MPa)
Figure 4 Type B, BS (PW 4.0 MPa)
C3/T 3943—2002
Table 3 Basic dimensions and structural dimensions of type A and type B check valves with FW of 4.0 and 6.4 MPa
40230 105 334310
250110
And Table 4,
White position is range
35. 3 32. 3
37. 716. 4
AS with FV of 0. 6, 1. 0, 1. 6 and 2. 51Pa The structure of the stop check valve of type AS and type BS is shown in Figure 1 and Figure 2. Table 4. Basic dimensions of the AS and BS stop check valves with nominal pressure of 0.6, 1.0, 1.6 and 2.5 MPa. Unit: mm. AS type valve type AS type BS type 225 202 155 132 67.5 62. 6 162.6 155. 0 220.0 211.0 655. 0 155. (223.0 212.0 50. 546. 1
131.0016.3
67.2160.5
1.). 02U6.
Nominal forceNominal
Structural size
Table 4 (continued)
130390
CH/T 3943-2002
2025022
450|32
12750036
Quantity name
AS type
129.0124.0
167.2160.2
215.0206.0
3. 3. 4 PW is 4. 0 and 6. 4 MPa The structure and basic dimensions of AS type and BS type stop check valves are shown in Figure 3, Figure 4 and Table 5. Table 5 Basic dimensions of AS type and BS type stop check valves with pressure of 4.0 and 6.4 MPa Units:
Structural dimensions
313165
360175
230115
260130
50300 150|354325
3.4 Marking examples
170125
Re-named
AS type BS type
2.9/
27. 225. B
Nominal pressure is 2.5MPa, nominal diameter is 65m, flange connection size and sealing surface conform to GB/T569 straight-through flange stainless steel cut-off positive return width mark:
cut-off valve A25065CB/T3913-2002 nominal pressure is 2.5MPa, nominal diameter is 200ml, flange connection size and sealing surface conform to GB/2501 right angle flange stainless steel cut-off positive return valve mark:
Yuezhituan BS25200CB/T3943-2002
CB/T 3943-2002
4 Requirements
4.1 Materials
The materials of the main parts of the stop check valve are shown in Table 6. Table 6 Materials of the main parts of the stop check valve
Parts name
Valve body, valve cover, valve disc
Valve stem, fasteners
Packing, gasket
PV4.0KPa welding sealing surface
Note: Valve disc can be replaced by plated parts with T.||t t||4.2 Castings
Stainless steel
Tetrafluoroethylene
Copper, chromium: hard alloy
ZGOCr18Ni9
ZG00Cr17Ni1-03
Standard No.
GB/T2100-1980
《Sharpening and Welding Specification (198 Single
GB/T1220-1992||tt| |4.2.1 The chemical composition and mechanical properties of the stainless steel castings of the stop check valve shall comply with the requirements of GB/T2100-1980 or the "Materials and Welding Specifications".
4.2.2 The stainless steel castings of the stop check valve shall be subjected to solution treatment at a temperature not lower than 1000°C and rapidly cooled in water. 4.2.3 For stop check valves used for liquefied gas at a temperature lower than -55°C, the stainless steel castings shall provide one set of three Charpy V-notch impact tests per furnace in accordance with the requirements of the "Materials and Welding Specifications". 4.2.4 The stop check valve castings made of ZGOCr-18Ni9 material shall be inspected for inter-product corrosion tendency. 4.2.5 For the stop check valve stainless steel castings that require cladding of diamond, chromium, and hook carbide on the sealing surface, the solution treatment shall be carried out after cladding. 4.2.6 Each furnace casting shall have at least three test bars with furnace numbers for inspection. The shelf life shall not be less than three years. 4.2.7 The operating temperature is -100 When the temperature is below ℃, the valve body, valve cover, valve disc and stem shall be cryogenically treated. 4.3 Machining
The stainless steel sealing surface of the stop check valve shall be finely turned or ground. 1., 4. 4 Strength
The strength of the stop check valve body shall be free of leakage under the hydraulic pressure of 1.5 times the nominal pressure. 4.5 Sealing
4.5.1 When the stop check valve is fully closed, the sealing between the valve disc and the valve reservoir shall be free of leakage under the hydraulic pressure of 1.1 times the nominal pressure. 4.5.2 When the stop check valve is fully opened, the sealing between the valve stem and the valve stem shall not exceed 10mm/min under the hydraulic pressure of 1.0 times the nominal pressure.
4.6 Dimensional tolerance
The dimensional tolerance of the stop check valve shall comply with the requirements of 3.2, 3.3 and 3.10 in GB/T600-1991. 4.7 Geometric tolerances
The geometric tolerances of stop check valves shall comply with the requirements of 3.1 of CB/T 600-1991. 4.8 Appearance
The appearance of stop check valves shall comply with the requirements of 3.4~3.9 of GB/T 600-1991. 5 Test methods
Chemical composition and mechanical properties of castings
CB/T 3943-2002
5.1.1 The test methods for chemical composition and mechanical properties of stop check stainless steel castings shall be carried out in accordance with the provisions of GB/T 2100-1980. The results shall comply with the requirements of 4.2.1.
5.1.2 The intergranular etching test method of stop check valve stainless steel castings shall be carried out in accordance with the provisions of 3.8.5 of "Materials and Welding Specifications" (1998), and the results shall comply with the requirements of 4.2.4. 5.2 Cryogenic treatment
The method of cryogenic treatment of parts is: immerse the parts in a liquid ammonia tank, keep them warm for 12 hours when the temperature reaches 196℃, then put them out of the water, and return them to room temperature. Repeat the cycle twice. 5.3 Processing
Inspect the work of the stop check valve by the method of galvanometer. The result should meet the requirements of 4.3. 5.4 Strength
The test method of the body strength of the stop check valve shall be carried out in accordance with the provisions of 4.1.2, 4.1.3 and 4.3.1 of GB/600-1991. The result should meet the requirements of 4.4.
5.5 Sealing
5.5.1 The test method of the sealing between the stop check valve disc and the ceramic seat shall be carried out in accordance with the provisions of 4.2.2 and 4.3.1 of 6B/600-1991. The result should meet the requirements of 4.5.1.
5.5.2 The test method for the sealing between the stem and the bonnet of the stop check valve is as follows: without adding stuffing mud to the stuffing box, fully open the valve so that the valve stem and the bonnet are close to each other, and then the valve cavity is filled with mud, and the mud is added to the nominal bottom force value, and the leakage is collected from the stuffing box. The result meets the requirements of 4.5.2.
5.6 Dimensions and dimensional tolerances
The linear dimension tolerances of the stop check valve are checked with the corresponding grade of measuring tools. The results should meet the requirements of 3.3 and 4.6. 5. Geometric tolerances
The geometric tolerances of the stop check valve are guaranteed with the corresponding grade of tooling. The results shall meet the requirements of 1.7, 5.8 Appearance
The appearance of the cut-off positive return valve shall be inspected by oral measurement, and the results shall meet the requirements of 4.8, 6 Inspection rules
6.1 Inspection classification
The inspection of the cut-off positive return valve is divided into type inspection and factory inspection. 6.2 Type inspection
B.2.1 Inspection timing
When the following situations occur, the cut-off positive return valve shall be subjected to type inspection: a) New product production appraisal:
b) When the product is put into production and the process of industrial supervision undergoes major changes; c) When major quality problems are found during the batch production process d) When the relevant national quality inspection department proposes inspection. 6.2.2 Inspection Items Type inspection items shall comply with the provisions in the table 1. CB/T3943-2002 Items Chemical composition and mechanical properties of parts Intergranular corrosion Sealing Dimensions and dimension tolerances Form tolerances "√" indicates items to be inspected: Number of inspection samples Table 7 Inspection items Chapter and article number of requirements 3.3, 4.6 |一" indicates that no inspection items are required.
The number of samples for type inspection of stop check valves shall be no less than 3. 6.2.4 Judgment rules
Chapter of test method, Article number
Type inspection:
All samples of stop check valves meet the requirements for all inspection items and are judged to be qualified for type inspection. If there are items that do not meet the requirements, double sampling is allowed for re-inspection. If there are still items that do not meet the requirements after re-inspection, it is considered to be unqualified for type inspection. 6.3 Delivery inspection
6.3.1 The delivery inspection items of stop check valves shall be in accordance with Table 7. 6.3.2 The delivery inspection shall be carried out product by product. 6.3.3 Judgment rules
The cut-off number for all inspection items that meet the requirements is determined as the delivery inspection. 6.3.3.2 If the chemical composition, mechanical properties and intergranular corrosion test potential of the castings do not meet the requirements, it is judged to be unqualified for factory inspection.
, for the inspection of other items, if there are any stop check valves that do not meet the requirements, they will be reviewed and allowed to be repaired and re-inspected. If the re-inspection still does not meet the requirements of 6.3.3.3
, the stop check valve is judged to be unqualified. 7 Marking and packaging
7.1 The marking of stop check valves shall be in accordance with the provisions of (B/T 3032. 7.2 The packaging of stop check valves shall be in accordance with the provisions of 6.2-6.4 of CB/T600-1991. 80KPa cladding sealing surface
Note: Valve disc is allowed to use plated parts with T.
4.2 Castings
Stainless steel
Tetrafluoroethylene
Copper, chromium: hard alloy
ZGOCr18Ni9
ZG00Cr17Ni1-03
Standard No.
GB/T2100-1980
"Materials and Welding Specifications (198 Single
GB/T1220-1992
4.2.1 The chemical composition and mechanical properties of stainless steel castings of stop valves shall comply with the requirements of GB/T2100-1980 or "Materials and Welding Specifications",
|4.2.2 The stainless steel castings of stop check valves shall be subjected to solution treatment at a temperature not lower than 1000°C and rapidly cooled in water. 4.2.3 For stop check valves used for liquefied gas at a temperature lower than -55°C, the stainless steel castings shall provide one set of three Charpy V-notch impact tests per furnace in accordance with the requirements of the "Materials and Welding Specifications". 4.2.4 The stop check valve castings made of ZGOCr-18Ni9 material shall be inspected for inter-product corrosion tendency. 4.2.5 For the stop check valve stainless steel castings that require cladding of diamond, chromium, and hook carbide on the sealing surface, the solution treatment shall be carried out after cladding. 4.2.6 Each furnace of castings shall have at least three test bars with furnace numbers for inspection. The shelf life shall not be less than three years. 4.2.7 The operating temperature is -100 When the temperature is below ℃, the valve body, valve cover, valve disc and wide rod shall be cryogenically treated. 4.3 Processing
The stainless steel sealing surface of the upper part shall be processed by fine turning or grinding. 1., 4. 4 Strength
The strength of the stop check valve body should be free of leakage under a hydraulic pressure of 1.5 times the nominal pressure. 4.5 Sealing
4.5.1 When the stop check valve is fully closed, the sealing between the valve disc and the valve reservoir should be free of leakage under a hydraulic pressure of 1.1 times the nominal pressure. 4.5.2 When the stop check valve is fully opened, the sealing between the valve stem and the valve stem should not exceed 10mm/min under a hydraulic pressure of 1.0 times the nominal pressure.
4.6 Dimensional tolerance
The dimensional tolerance of the stop check valve shall comply with the requirements of 3.2, 3.3, and 3.10 of GB/T600-1991. 4.7 Geometric tolerance
The geometric tolerance of the stop check valve shall comply with the requirements of 3.1 of CB/T 600-1991. 4.8 Appearance
The appearance of the stop check valve shall comply with GB/T CB/T 3943-2002 5.1.1 The test method for chemical composition and mechanical properties of stainless steel castings shall be carried out in accordance with the provisions of GB/T 2100-1980. The results shall meet the requirements of 4.2.1. 5.1.2 The intergranular corrosion test method for stainless steel castings of check valves shall be carried out in accordance with the provisions of 3.8.5 of "Materials and Welding Specifications" (1998), and the results shall meet the requirements of 4.2.4. 5.2 Cryogenic treatment
The method of cryogenic treatment of parts is: immerse the parts in a liquid ammonia tank, keep them warm for 12 hours when the temperature reaches 196℃, then put them out of the water, and return them to room temperature. Repeat the cycle twice. 5.3 Processing
Inspect the work of the stop check valve by the method of galvanometer. The result should meet the requirements of 4.3. 5.4 Strength
The test method of the body strength of the stop check valve shall be carried out in accordance with the provisions of 4.1.2, 4.1.3 and 4.3.1 of GB/600-1991. The result should meet the requirements of 4.4. wwW.bzxz.Net
5.5 Sealing
5.5.1 The test method of the sealing between the stop check valve disc and the ceramic seat shall be carried out in accordance with the provisions of 4.2.2 and 4.3.1 of 6B/600-1991. The result should meet the requirements of 4.5.1.
5.5.2 The test method for the sealing between the stem and the bonnet of the stop check valve is as follows: without adding stuffing mud to the stuffing box, fully open the valve so that the valve stem and the bonnet are close to each other, and then the valve cavity is filled with mud, and the mud is added to the nominal bottom force value, and the leakage is collected from the stuffing box. The result meets the requirements of 4.5.2.
5.6 Dimensions and dimensional tolerances
The linear dimension tolerances of the stop check valve are checked with the corresponding grade of measuring tools. The results should meet the requirements of 3.3 and 4.6. 5. Geometric tolerances
The geometric tolerances of the stop check valve are guaranteed with the corresponding grade of tooling. The results shall meet the requirements of 1.7, 5.8 Appearance
The appearance of the cut-off positive return valve shall be inspected by oral measurement, and the results shall meet the requirements of 4.8, 6 Inspection rules
6.1 Inspection classification
The inspection of the cut-off positive return valve is divided into type inspection and factory inspection. 6.2 Type inspection
B.2.1 Inspection timing
When the following situations occur, the cut-off positive return valve shall be subjected to type inspection: a) New product production appraisal:
b) When the product is put into production and the process of industrial supervision undergoes major changes; c) When major quality problems are found during the batch production process d) When the relevant national quality inspection department proposes inspection. 6.2.2 Inspection Items Type inspection items shall comply with the provisions in the table 1. CB/T3943-2002 Items Chemical composition and mechanical properties of parts Intergranular corrosion Sealing Dimensions and dimension tolerances Form tolerances "√" indicates items to be inspected: Number of inspection samples Table 7 Inspection items Chapter and article number of requirements 3.3, 4.6 |一" indicates that no inspection items are required.
The number of samples for type inspection of stop check valves shall be no less than 3. 6.2.4 Judgment rules
Chapter of test method, Article number
Type inspection:
All samples of stop check valves meet the requirements for all inspection items and are judged to be qualified for type inspection. If there are items that do not meet the requirements, double sampling is allowed for re-inspection. If there are still items that do not meet the requirements after re-inspection, it is considered to be unqualified for type inspection. 6.3 Delivery inspection
6.3.1 The delivery inspection items of stop check valves shall be in accordance with Table 7. 6.3.2 The delivery inspection shall be carried out product by product. 6.3.3 Judgment rules
The cut-off number for all inspection items that meet the requirements is determined as the delivery inspection. 6.3.3.2 If the chemical composition, mechanical properties and intergranular corrosion test potential of the castings do not meet the requirements, it is judged to be unqualified for factory inspection.
, for the inspection of other items, if there are any stop check valves that do not meet the requirements, they will be reviewed and allowed to be repaired and re-inspected. If the re-inspection still does not meet the requirements of 6.3.3.3
, the stop check valve is judged to be unqualified. 7 Marking and packaging
7.1 The marking of stop check valves shall be in accordance with the provisions of (B/T 3032. 7.2 The packaging of stop check valves shall be in accordance with the provisions of 6.2-6.4 of CB/T600-1991. 80KPa cladding sealing surface
Note: Valve disc is allowed to use plated parts with T.
4.2 Castings
Stainless steel
Tetrafluoroethylene
Copper, chromium: hard alloy
ZGOCr18Ni9
ZG00Cr17Ni1-03
Standard No.
GB/T2100-1980
"Materials and Welding Specifications (198 Single
GB/T1220-1992
4.2.1 The chemical composition and mechanical properties of stainless steel castings of stop valves shall comply with the requirements of GB/T2100-1980 or "Materials and Welding Specifications",
|4.2.2 The stainless steel castings of stop check valves shall be subjected to solution treatment at a temperature not lower than 1000°C and rapidly cooled in water. 4.2.3 For stop check valves used for liquefied gas at a temperature lower than -55°C, the stainless steel castings shall provide one set of three Charpy V-notch impact tests per furnace in accordance with the requirements of the "Materials and Welding Specifications". 4.2.4 The stop check valve castings made of ZGOCr-18Ni9 material shall be inspected for inter-product corrosion tendency. 4.2.5 For the stop check valve stainless steel castings that require cladding of diamond, chromium, and hook carbide on the sealing surface, the solution treatment shall be carried out after cladding. 4.2.6 Each furnace of castings shall have at least three test bars with furnace numbers for inspection. The shelf life shall not be less than three years. 4.2.7 The operating temperature is -100 When the temperature is below ℃, the valve body, valve cover, valve disc and wide rod shall be cryogenically treated. 4.3 Processing
The stainless steel sealing surface of the upper part shall be processed by fine turning or grinding. 1., 4. 4 Strength
The strength of the stop check valve body should be free of leakage under a hydraulic pressure of 1.5 times the nominal pressure. 4.5 Sealing
4.5.1 When the stop check valve is fully closed, the sealing between the valve disc and the valve reservoir should be free of leakage under a hydraulic pressure of 1.1 times the nominal pressure. 4.5.2 When the stop check valve is fully opened, the sealing between the valve stem and the valve stem should not exceed 10mm/min under a hydraulic pressure of 1.0 times the nominal pressure.
4.6 Dimensional tolerance
The dimensional tolerance of the stop check valve shall comply with the requirements of 3.2, 3.3, and 3.10 of GB/T600-1991. 4.7 Geometric tolerance
The geometric tolerance of the stop check valve shall comply with the requirements of 3.1 of CB/T 600-1991. 4.8 Appearance
The appearance of the stop check valve shall comply with GB/T CB/T 3943-2002 5.1.1 The test method for chemical composition and mechanical properties of stainless steel castings shall be carried out in accordance with the provisions of GB/T 2100-1980. The results shall meet the requirements of 4.2.1. 5.1.2 The intergranular corrosion test method for stainless steel castings of check valves shall be carried out in accordance with the provisions of 3.8.5 of "Materials and Welding Specifications" (1998), and the results shall meet the requirements of 4.2.4. 5.2 Cryogenic treatment
The method of cryogenic treatment of parts is: immerse the parts in a liquid ammonia tank, keep them warm for 12 hours when the temperature reaches 196℃, then put them out of the water, and return them to room temperature. Repeat the cycle twice. 5.3 Processing
Inspect the work of the stop check valve by the method of galvanometer. The result should meet the requirements of 4.3. 5.4 Strength
The test method of the body strength of the stop check valve shall be carried out in accordance with the provisions of 4.1.2, 4.1.3 and 4.3.1 of GB/600-1991. The result should meet the requirements of 4.4.
5.5 Sealing
5.5.1 The test method of the sealing between the stop check valve disc and the ceramic seat shall be carried out in accordance with the provisions of 4.2.2 and 4.3.1 of 6B/600-1991. The result should meet the requirements of 4.5.1.
5.5.2 The test method for the sealing between the stem and the bonnet of the stop check valve is as follows: without adding stuffing mud to the stuffing box, fully open the valve so that the valve stem and the bonnet are close to each other, and then the valve cavity is filled with mud, and the mud is added to the nominal bottom force value, and the leakage is collected from the stuffing box. The result meets the requirements of 4.5.2.
5.6 Dimensions and dimensional tolerances
The linear dimension tolerances of the stop check valve are checked with the corresponding grade of measuring tools. The results should meet the requirements of 3.3 and 4.6. 5. Geometric tolerances
The geometric tolerances of the stop check valve are guaranteed with the corresponding grade of tooling. The results shall meet the requirements of 1.7, 5.8 Appearance
The appearance of the cut-off positive return valve shall be inspected by oral measurement, and the results shall meet the requirements of 4.8, 6 Inspection rules
6.1 Inspection classification
The inspection of the cut-off positive return valve is divided into type inspection and factory inspection. 6.2 Type inspection
B.2.1 Inspection timing
When the following situations occur, the cut-off positive return valve shall be subjected to type inspection: a) New product production appraisal:
b) When the product is put into production and the process of industrial supervision undergoes major changes; c) When major quality problems are found during the batch production process d) When the relevant national quality inspection department proposes inspection. 6.2.2 Inspection Items Type inspection items shall comply with the provisions in the table 1. CB/T3943-2002 Items Chemical composition and mechanical properties of parts Intergranular corrosion Sealing Dimensions and dimension tolerances Form tolerances "√" indicates items to be inspected: Number of inspection samples Table 7 Inspection items Chapter and article number of requirements 3.3, 4.6 |一" indicates that no inspection items are required.
The number of samples for type inspection of stop check valves shall be no less than 3. 6.2.4 Judgment rules
Chapter of test method, Article number
Type inspection:
All samples of stop check valves meet the requirements for all inspection items and are judged to be qualified for type inspection. If there are items that do not meet the requirements, double sampling is allowed for re-inspection. If there are still items that do not meet the requirements after re-inspection, it is considered to be unqualified for type inspection. 6.3 Delivery inspection
6.3.1 The delivery inspection items of stop check valves shall be in accordance with Table 7. 6.3.2 The delivery inspection shall be carried out product by product. 6.3.3 Judgment rules
The cut-off number for all inspection items that meet the requirements is determined as the delivery inspection. 6.3.3.2 If the chemical composition, mechanical properties and intergranular corrosion test potential of the castings do not meet the requirements, it is judged to be unqualified for factory inspection.
, for the inspection of other items, if there are any stop check valves that do not meet the requirements, they will be reviewed and allowed to be repaired and re-inspected. If the re-inspection still does not meet the requirements of 6.3.3.3
, the stop check valve is judged to be unqualified. 7 Marking and packaging
7.1 The marking of stop check valves shall be in accordance with the provisions of (B/T 3032. 7.2 The packaging of stop check valves shall be in accordance with the provisions of 6.2-6.4 of CB/T600-1991. 81 When the stop check valve is fully closed, the sealing between the valve disc and the valve reservoir should be free of leakage under a hydraulic pressure of 1.1 times the nominal pressure. 4.5.2 When the stop check valve is fully opened, the sealing between the valve stem and the valve stem should not have a leakage of more than 10 mm/min under a hydraulic pressure of 1.0 times the nominal pressure.
4.6 Dimensional tolerances
The dimensional tolerances of the stop check valve shall comply with the requirements of 3.2, 3.3, and 3.10 of GB/T600-1991. 4.7 Form and position tolerances
The form and position tolerances of the stop check valve shall comply with the requirements of 3.1 of CB/T 600-1991. 4.8 Appearance
The appearance of the stop check valve shall comply with the requirements of 3.4 to 3.9 of GB/T 600-1991. 5 Test methods
Chemical composition and mechanical properties of castings
CB/T 3943-2002
5.1.1 The test methods for chemical composition and mechanical properties of stainless steel castings shall be carried out in accordance with the provisions of GB/T 2100-1980. The results shall meet the requirements of 4.2.1.
5.1.2 The intergranular corrosion test method of stainless steel castings of check valves shall be carried out in accordance with the provisions of 3.8.5 of "Standard for Materials and Welding" (1998), and the results shall meet the requirements of 4.2.4. 5.2 Cryogenic treatment
The cryogenic treatment method of parts is: immerse the parts in a liquid ammonia box, and keep them warm for 12 hours when the temperature of the parts reaches 196℃, then cool them to room temperature, and repeat the cycle twice. 5.3 Processing
The workpiece is checked by the method of galvanometer, and the results shall meet the requirements of 4.3. 5.4 Strength
The test method for the body strength of the stop check valve shall be carried out in accordance with the provisions of 4.1.2, 4.1.3 and 4.3.1 of GB/600-1991. The results shall meet the requirements of 4.4.
5.5 Sealing
5.5.1 The test method for the sealing between the plate and the seat of the stop check valve shall be carried out in accordance with the provisions of 4.2.2 and 4.3.1 of 6B/600-1991. The results shall meet the requirements of 4.5.1.
5.5.2 The test method for the sealing between the stem and the bonnet of the stop check valve is as follows: When the stuffing box is not filled with stuffing mud, the valve is fully opened so that the high-pressure surfaces between the stem and the bonnet are closely attached to each other, and then the valve cavity is filled with mud, and the mud is added to the nominal bottom force value, and the leakage is collected from the stuffing box port. The results meet the requirements of 4.5.2.
5.6 Dimensions and dimensional tolerances
The linear dimension tolerances of the cut-off positive return valve shall be checked with the corresponding grade of measuring tools. The results shall meet the requirements of 3.3 and 4.6. 5. Geometric tolerances
The geometric tolerances of the cut-off positive return valve shall be guaranteed with the corresponding grade of tooling. The results shall meet the requirements of 1.7. 5.8 Appearance
The appearance of the cut-off positive return valve shall be checked by oral measurement, and the results shall meet the requirements of 4.8. 6 Inspection rules
6.1 Inspection classification
The inspection of the cut-off positive return valve is divided into type inspection and factory inspection. 6.2 Type inspection
B.2.1 Inspection timing
Type inspection should be carried out in the following circumstances: a) Production appraisal of new products; b) When major changes occur in product production and process supervision; c) When major quality accidents are found during batch production; d) When relevant national quality inspection departments request inspection. 6.2.2 Inspection Items Type inspection items shall comply with the provisions in the table 1. CB/T3943-2002 Items Chemical composition and mechanical properties of parts Intergranular corrosion Sealing Dimensions and dimension tolerances Form tolerances "√" indicates items to be inspected: Number of inspection samples Table 7 Inspection items Chapter and article number of requirements 3.3, 4.6 |一" indicates that no inspection items are required.
The number of samples for type inspection of stop check valves shall be no less than 3. 6.2.4 Judgment rules
Chapter of test method, Article number
Type inspection:
All samples of stop check valves meet the requirements for all inspection items and are judged to be qualified for type inspection. If there are items that do not meet the requirements, double sampling is allowed for re-inspection. If there are still items that do not meet the requirements after re-inspection, it is considered to be unqualified for type inspection. 6.3 Delivery inspection
6.3.1 The delivery inspection items of stop check valves shall be in accordance with Table 7. 6.3.2 The delivery inspection shall be carried out product by product. 6.3.3 Judgment rules
The cut-off number for all inspection items that meet the requirements is determined as the delivery inspection. 6.3.3.2 If the chemical composition, mechanical properties and intergranular corrosion test potential of the castings do not meet the requirements, it is judged to be unqualified for factory inspection.
, for the inspection of other items, if there are any stop check valves that do not meet the requirements, they will be reviewed and allowed to be repaired and re-inspected. If the re-inspection still does not meet the requirements of 6.3.3.3
, the stop check valve is judged to be unqualified. 7 Marking and packaging
7.1 The marking of stop check valves shall be in accordance with the provisions of (B/T 3032. 7.2 The packaging of stop check valves shall be in accordance with the provisions of 6.2-6.4 of CB/T600-1991. 81 When the stop check valve is fully closed, the sealing between the valve disc and the valve reservoir should be free of leakage under a hydraulic pressure of 1.1 times the nominal pressure. 4.5.2 When the stop check valve is fully opened, the sealing between the valve stem and the valve stem should not have a leakage of more than 10 mm/min under a hydraulic pressure of 1.0 times the nominal pressure.
4.6 Dimensional tolerances
The dimensional tolerances of the stop check valve shall comply with the requirements of 3.2, 3.3, and 3.10 of GB/T600-1991. 4.7 Form and position tolerances
The form and position tolerances of the stop check valve shall comply with the requirements of 3.1 of CB/T 600-1991. 4.8 Appearance
The appearance of the stop check valve shall comply with the requirements of 3.4 to 3.9 of GB/T 600-1991. 5 Test methods
Chemical composition and mechanical properties of castings
CB/T 3943-2002
5.1.1 The test methods for chemical composition and mechanical properties of stainless steel castings shall be carried out in accordance with the provisions of GB/T 2100-1980. The results shall meet the requirements of 4.2.1.
5.1.2 The intergranular corrosion test method of stainless steel castings of check valves shall be carried out in accordance with the provisions of 3.8.5 of "Standard for Materials and Welding" (1998), and the results shall meet the requirements of 4.2.4. 5.2 Cryogenic treatment
The cryogenic treatment method of parts is: immerse the parts in a liquid ammonia box, and keep them warm for 12 hours when the temperature of the parts reaches 196℃, then cool them to room temperature, and repeat the cycle twice. 5.3 Processing
The workpiece is checked by the method of galvanometer, and the results shall meet the requirements of 4.3. 5.4 Strength
The test method for the body strength of the stop check valve shall be carried out in accordance with the provisions of 4.1.2, 4.1.3 and 4.3.1 of GB/600-1991. The results shall meet the requirements of 4.4.
5.5 Sealing
5.5.1 The test method for the sealing between the plate and the seat of the stop check valve shall be carried out in accordance with the provisions of 4.2.2 and 4.3.1 of 6B/600-1991. The results shall meet the requirements of 4.5.1.
5.5.2 The test method for the sealing between the stem and the bonnet of the stop check valve is as follows: When the stuffing box is not filled with stuffing mud, the valve is fully opened so that the high-pressure surfaces between the stem and the bonnet are closely attached to each other, and then the valve cavity is filled with mud, and the mud is added to the nominal bottom force value, and the leakage is collected from the stuffing box port. The results meet the requirements of 4.5.2.
5.6 Dimensions and dimensional tolerances
The linear dimension tolerances of the cut-off positive return valve shall be checked with the corresponding grade of measuring tools. The results shall meet the requirements of 3.3 and 4.6. 5. Geometric tolerances
The geometric tolerances of the cut-off positive return valve shall be guaranteed with the corresponding grade of tooling. The results shall meet the requirements of 1.7. 5.8 Appearance
The appearance of the cut-off positive return valve shall be checked by oral measurement, and the results shall meet the requirements of 4.8. 6 Inspection rules
6.1 Inspection classification
The inspection of the cut-off positive return valve is divided into type inspection and factory inspection. 6.2 Type inspection
B.2.1 Inspection timing
Type inspection should be carried out in the following circumstances: a) Production appraisal of new products; b) When major changes occur in product production and process supervision; c) When major quality accidents are found during batch production; d) When relevant national quality inspection departments request inspection. 6.2.2 Inspection Items Type inspection items shall comply with the provisions in the table 1. CB/T3943-2002 Items Chemical composition and mechanical properties of parts Intergranular corrosion Sealing Dimensions and dimension tolerances Form tolerances "√" indicates items to be inspected: Number of inspection samples Table 7 Inspection items Chapter and article number of requirements 3.3, 4.6 |一" indicates that no inspection items are required.
The number of samples for type inspection of stop check valves shall be no less than 3. 6.2.4 Judgment rules
Chapter of test method, Article number
Type inspection:
All samples of stop check valves meet the requirements for all inspection items and are judged to be qualified for type inspection. If there are items that do not meet the requirements, double sampling is allowed for re-inspection. If there are still items that do not meet the requirements after re-inspection, it is considered to be unqualified for type inspection. 6.3 Delivery inspection
6.3.1 The delivery inspection items of stop check valves shall be in accordance with Table 7. 6.3.2 The delivery inspection shall be carried out product by product. 6.3.3 Judgment rules
The cut-off number for all inspection items that meet the requirements is determined as the delivery inspection. 6.3.3.2 If the chemical composition, mechanical properties and intergranular corrosion test potential of the castings do not meet the requirements, it is judged to be unqualified for factory inspection.
, for the inspection of other items, if there are any stop check valves that do not meet the requirements, they will be reviewed and allowed to be repaired and re-inspected. If the re-inspection still does not meet the requirements of 6.3.3.3
, the stop check valve is judged to be unqualified. 7 Marking and packaging
7.1 The marking of stop check valves shall be in accordance with the provisions of (B/T 3032. 7.2 The packaging of stop check valves shall be in accordance with the provisions of 6.2-6.4 of CB/T600-1991. 82 Inspection items
Type inspection shall comply with the provisions in the table. 1
CB/T3943—2002
Item number
Chemical composition and mechanical properties of parts
Intergranular corrosion
Sealing
Dimensions and dimensional tolerances
Form tolerances
“√” indicates items to be inspected:
Number of inspection samples
Table 7 Inspection items
Chapter and article number of requirements
3.3, 4.6
一"" indicates that no inspection or adjustment items are required. The number of samples for type inspection of stop check valves shall be no less than 3. 6.2.4 Judgment rules
Chapter of the test method, Article number
Type inspection:
All samples of stop check valves meet the requirements for all inspection items and are judged to be qualified for type inspection. If there are items that do not meet the requirements, double sampling is allowed for re-inspection. If there are still items that do not meet the requirements after re-inspection, it is considered to be unqualified for type inspection. 6.3 Delivery inspection
6.3.1 Delivery inspection items for stop check valves shall be in accordance with Table 7. 6.3.2 "" inspection shall be carried out product by product. 6.3.3 Judgment rules
All inspection items meet the requirements and are judged to be qualified for delivery inspection. 6.3.3.2 If the chemical composition, mechanical properties and intergranular corrosion test potential of castings do not meet the requirements, it is judged to be unqualified for factory inspection.
, for the inspection of other items, if there are any stop check valves that do not meet the requirements, they will be reviewed and allowed to be repaired and re-inspected. If the re-inspection still does not meet the requirements of 6.3.3.3
, the stop check valve is judged to be unqualified. 7 Marking and packaging
7.1 The marking of stop check valves shall be in accordance with the provisions of (B/T 3032. 7.2 The packaging of stop check valves shall be in accordance with the provisions of 6.2-6.4 of CB/T600-1991. 82 Inspection items
Type inspection shall comply with the provisions in the table. 1
CB/T3943—2002
Item number
Chemical composition and mechanical properties of parts
Intergranular corrosion
Sealing
Dimensions and dimensional tolerances
Form tolerances
“√” indicates items to be inspected:
Number of inspection samples
Table 7 Inspection items
Chapter and article number of requirements
3.3, 4.6
一"" indicates that no inspection or adjustment items are required. The number of samples for type inspection of stop check valves shall be no less than 3. 6.2.4 Judgment rules
Chapter of the test method, Article number
Type inspection:
All samples of stop check valves meet the requirements for all inspection items and are judged to be qualified for type inspection. If there are items that do not meet the requirements, double sampling is allowed for re-inspection. If there are still items that do not meet the requirements after re-inspection, it is considered to be unqualified for type inspection. 6.3 Delivery inspection
6.3.1 Delivery inspection items for stop check valves shall be in accordance with Table 7. 6.3.2 "" inspection shall be carried out product by product. 6.3.3 Judgment rules
All inspection items meet the requirements and are judged to be qualified for delivery inspection. 6.3.3.2 If the chemical composition, mechanical properties and intergranular corrosion test potential of castings do not meet the requirements, it is judged to be unqualified for factory inspection.
, for the inspection of other items, if there are any stop check valves that do not meet the requirements, they will be reviewed and allowed to be repaired and re-inspected. If the re-inspection still does not meet the requirements of 6.3.3.3
, the stop check valve is judged to be unqualified. 7 Marking and packaging
7.1 The marking of stop check valves shall be in accordance with the provisions of (B/T 3032. 7.2 The packaging of stop check valves shall be in accordance with the provisions of 6.2-6.4 of CB/T600-1991. 8
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