Some standard content:
ICS 47.020.30
Reference number: 111432003
Ship Industry Standard of the People's Republic of China
CB/T 3945-2002
Flanged cast steel belt bellows stop valve
Cast steel flanged stup valves with bellows2002-11-20 Issued
National Defense Science, Technology and Industry Commission Issued
2003-02-01 Implementation
CB/T 39452002
This standard specifies that the B-type flanged stup valve is in accordance with the standard connection size and density of the bellows stop valve, and the common connection size and sealing surface of the ship flange connection size and sealing surface of the ship flange connection size and sealing surface of the ship flange connection size are as follows: The structure of the cast steel stop valve is in accordance with the standard of GR/T58419996. The S-type and S-type flanged stop valves with bellows specified in the standard shall be in accordance with the provisions of GB/2501-1989 for flanged connection and the tightness (four sections): the length of the structure shall be consistent with the length of the metal door with flange connection in GB/11698-1989. This standard is issued by China Shipbuilding Industry Corporation. This standard is owned by the Shipbuilding Industry Comprehensive Technology and Economic Research Institute. This standard is issued by: China Shipbuilding Industry Comprehensive Technology and Economic Research Institute, Jiangqiu City Ship Accessories Factory, Yanfang Yundong Ship Gate Factory, Wuxi Fangbopu, and other new shipbuilding companies. The owners of this standard are Feng Kuaibao, Wu Yuming, Mi Jingming, Luo Fayuan, and Quanzhou. 1 Scope
Flanged cast steel stop valve with bellows
CB/T 3945—2002
This standard specifies the flange dimensions and sealing surface according to CB/TEE/T201 and the specifications, requirements, test methods, inspection specifications, marking and packaging of steel pipes with grade 2 pipes (hereinafter referred to as steel pipes). The standard is applicable to equipment, manufacture and acceptance of equipment in refrigeration and cooling systems with a working temperature of not more than 10.0 MPa, high-pressure steam, high-humidity water, high-temperature oil vacuum, and refrigeration and cooling equipment systems with a working temperature of 0-250℃. 2 Normative references
The following documents shall apply to the following items: The references in this standard are used as references to the clauses in the table. For any referenced document of a general period, its subsequent amendments (excluding the code) are not applicable to the same technical standard. However, the parties who have obtained the agreement based on this standard shall examine whether to use the latest versions of these documents. For any referenced document not specified, its latest version shall apply to the standard, GB/T5E9 ship thread connection size and sealing surface GP/T600-1991 tire pipeline general technical conditions for fittings allow clear summary of the tree steel
GH/: E9H--1H99
GH/:220-92 Stainless steel flange
GB/T3032
Flange to grade and cover (four-position) Ship pipeline Yin cattle mark
GR/T4239:99
Stainless steel and heat-resistant steel cold-rolled strip
Metal corrugated expansion joint general technical conditions G3/T12777
CB/T772-1998 Magnetic Sheli Carbon Nozzle Reading Parts Technical conditions 3 Classification
3.1 Type
The type of the cut-off is as follows:
Type B—
The flange connection size and hollow surface are in accordance with the straight cut of GR/T559; the flange quick connection size and density are in accordance with the straight cut valve of G/T9; the flange connection size and gradual surface are in accordance with the straight cut of G3/T2501. Cut-off: the flange connection size and sealing surface are in accordance with the right angle of G/T2501. CB/T3945-2002
3. 2 Basic parameters
Stop the interval effect see table!
Xingyue
3.3 Structure and size
Table! Temporary stop basic season number
T Hai, C
People Xu IHa
3. 3. 1 Series, 3 type or 1 of the structure will be and the basic size of the small length of the two, around 2 and Table 2 Figure 1A type, AS type
B type, BS type
Public temperature diameter
I -- i
Single must learn to
Show the square
Complete structure soldier size
-17
18:3 474
9 type Tibetan stop with the basic size
2A type,
Paai The basic dimensions of the ES type cut-off valve are shown in Figures 1, 2 and Table 1. The basic dimensions of the S type cut-off valve are shown in Figures 1, 2 and Table 1. The basic dimensions of the AS type, CB/T3945—2002, and the middle-aged g are CB/T 3945-2002
3.4 Marking example
The nominal pressure is 2.5MPF, the nominal diameter is 65, the flange connection size and density conform to GB/T569, the mark for the corrugated steel pipe stop valve is:
The nominal pressure is 2.5a, the nominal diameter is b0, the flange size and density conform to GB/T569, the mark for the corrugated steel pipe stop valve is:
The nominal pressure is 2.5a, the nominal diameter is b0, the flange size and density conform to /0, the mark for the liquid-free pipe is ||t t||The bellows shall comply with BS25050CB/39-15-20024 requirements
4.【Material
The material of the main parts of the bellows or the core quality shall be changed,
The material of the main parts of the bellows
Flash body, valve belt
bellows
4.2 Bellows
High-quality carbon fiber
Not made of wood
The bellows cut above shall comply with the requirements of: T12777. 4.2.1
ZG2:0·45C
CT/T 772-.99R
GR/-4259-13
4.2.2 The corrugated tube of the cut-off adjustment shall be connected with the adjustment sweeping inversely by using double-metal, and the surface shall be smooth and smooth, and the seam shall not have slag, pores, etc.
4.3 Castings
4.3.1 The chemical composition and mechanical properties of the cut-off parts shall be in accordance with CB/T72-1998 single dew point: 4.3.2 Each casting shall have at least one test specimen with a furnace number. The storage period shall not be less than 11 years. 4.4 Strength
4.4.1 The hydraulic strength of the cut-off lubricant shall be able to withstand .5 times the nominal positive force. 4.4.2 The hydraulic strength of the check valve stem welded to the check valve should be able to withstand 1.5 times the nominal pressure. 4.5 Sealing
The sealing surface of the valve should be free of leakage at 1.1 times the nominal pressure. 4.6 Dimensional tolerance
The dimensional tolerance of the plate should meet the requirements of GT/T600-1991 3.2, 3.3, 3.10 4. Geometric tolerance
The geometric tolerance of the plate should meet the requirements of GT/T60M0-1991 + 3.1 4. Appearance
The external measurement of the plate should meet the requirements of 1~3.5 of T60-151: 5 Test method
5.1 Corrugated tube
5.1.1 The test of corrugated tube shall be carried out according to the provisions of GR/T12777: The result shall meet the requirements of 1.2.1 4
5.1.2 After the corrugated tube is tested, the test method shall be used. The results are stored in 1.2.2. 5.2 Casting test
CR/T 3945-2002
The chemical composition and mechanical properties of the steel shall be tested in accordance with CBT77[99H regulations. The results shall meet the requirements of 4.3.
5.3 Strength
5.3.1 1. The strength test of the valve body shall be carried out in accordance with 4.1.2, 1.3 and 4.3.1 of GB/TG00-1991. The results shall meet the requirements of 11.
5.3.2 The test method for the stop valve is better than that of the pipe, but the strength is maintained at the rated force. The material is not relevant to the material. The result may meet the requirements of 2. 5.4 Sealing
Stop width Sealing cumulative force test method is in accordance with the provisions of 13.2 and 1.3.1 in GB/TG00-1991: No, it shall comply with the requirements of 4.5. 5.5 Dimensional tolerancewww.bzxz.net
The linear scale, and the public gauge test results shall comply with the requirements of 3.3 and 4.6. 5.6 Form and position tolerance
The form and position tolerance of the stop valve is tested with a gauge of the same grade. The cumulative result shall comply with the requirements of 4.7. 5.7 Appearance
The appearance of the stop valve is inspected by a strong inspection. The result shall comply with the requirements of 1.8. 6 Inspection rules
6.1 Inspection classification
The inspection of the stop valve is divided into type inspection and factory inspection. 6.2 Type inspection
6.2.1 Inspection timing Type inspection should be carried out in the following situations: a) New products with different technologies; h) Products put into production or undergo major technological changes; c) When major quality problems are found during production; c) When the relevant quality inspection department proposes inspection items; Type inspection items should be carried out in accordance with Table 5. Table 5 Inspection items should be inspected monthly; T.2.3 Inspection sample quantity requirements, Article 3. 3., 1. e. 1. 2. 2. 4. 8
“One” table, no inspection required items
Tax remaining type inspection column products should be no less than 3. Type inspection method five, article
Type control
Factory inspection
09/T3945—2005
6.2.4 Judgment rules
By the end of the week, all samples and all inspection items meet the requirements, it is judged as qualified for type inspection: if there are six items that meet the requirements, but the sample re-inspection results still do not meet the requirements, it is judged as not qualified for type inspection. 6.3 Factory inspection
6.3.1 The factory inspection is based on the table 5 rules, so each time the inspection should be submitted to the inspection department Refer to Table 5 for item-by-item inspection. Only qualified ones can leave the factory. 6.3.3 Determination of purchase regulations
8.3.3.1 All inspection items must meet the requirements and the valve must meet the factory inspection requirements. 6.3.3.2 If the chemical composition and mechanical properties of the stop valve do not meet the requirements, it will be deemed as a stop valve that does not meet the factory inspection requirements. 6.3.3.3 Other inspection items must be carried out. If there is any non-compliance, the stop valve must be restructured. It is allowed to be re-inspected after repair. If only the stop valve does not meet the requirements, the stop valve must be inspected and qualified.
? Marking and packaging
7.1 Check the stop valve according to GB/3032: 7.2 Packaging technology of stop valves according to GB/00=.2--4 according to regulations
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