CB/T 3946-2002 Flange cast steel with bellows stop check valve CB/T3946-2002 standard download decompression password: www.bzxz.net

1CS 47.020.30
Reservation number: 11144-2003
Ship industry standard of the People's Republic of China
CB/T 3946—2002
Cast steel flanged stop check valves with bellows
bellows2002-11-20 Release
National Defense Science, Technology and Industry Commission Release
200302-01 Implementation
CB/T39462002
This standard specifies the A type and B type "cast bellows shield" - only for national reading, its method of consulting the size and seal of the surface and the product 369-1955 flange connection size cover specification, special structure /58-1 ship knife "cast low cut-off example? The provisions of the A type and B zero stop valve in this standard group are as follows: the wire cast steel section effect calibration is placed on the positive callback, the connection size and seal are the same as 2511- 1989 flange connection and the provisions of the West) are consistent, its structural length is consistent with the H\H1353 flange class connection gold valve installation length "mixed. Standard mountain China industrial group to the proposed standard sound China comprehensive industrial comprehensive support technology economic research and development of this standard draft unit: China Super Processing Industry Comprehensive Technology Service Law Institute, the difference is limited to the city ship blade accessories! , Meicheng piece transport East fat door factory, no silver city involved in the desire to pipe! , the new equipment is heavy and has strong capital. This standard is drafted by: Bai Linbao, is, must mirror non, Luo Fayuan, Qiu Jinquan, 1 scope
flange cast steel belt bellows stop check valve
CB/T 3946—2002
This standard specifies the flange connection size and rate according to UB/T569. G/T2501 standard for the classification, number, inspection method, inspection rules, marking and packaging of cast steel corrugated single-check valves (hereinafter referred to as stop valves). This machine: It is used for the design, manufacture and acceptance of stop valves for hot steam, warm water, high temperature mooring, vacuum, cold and freezing systems with a pressure not higher than 2.5MPa and a temperature range of -30℃~200℃. 2 Regulatory references
The clauses in the following documents are verified by reference in this standard. Become the terms of this standard. For any referenced document with a reference date of three years, its subsequent amendments (excluding the contents of the date of error) and the like are not applicable to this standard. However, the parties who have reached an agreement on this standard according to this standard may use the latest versions of these documents. The documents listed in the referenced documents are not specified in the referenced documents. The latest versions of these documents shall apply to this standard: GR/T569 Dimensions and sealing surfaces of flanges G/600-1999 Applicable conditions for flange connection G/T699-1999 Quality carbon steel structure GB/T12201992 Small stainless steel structure GB/T 2501
CB/T S052
Ship connection dimensions and gear surface (four-position) Ship North Road Annex Other Standards
6B/T4239-1991:-1 Stainless steel heat-resistant steel cold-rolled steel section GB/~12777
Metal corrugated tube expansion general technical conditions
CB/772羽! Technical conditions for carbon steel and carbon steel parts 3 Classification
8.1 Type
The types of stop valves are as follows:
Type A—
Type BS—
Flange connection dimensions and sealing surface according to GB/T589 for straight-through stop check valves; flange connection dimensions and sealing surface according to GB/T069 for right-angle stop check valves: flange connection dimensions and sealing surface according to GB/T2501 for stop check valves, flange connection dimensions and sealing surface according to GB/T3501 for angle stop check valves CE/T 3946—2002
3.2 Basic parameters
1, 19
3.3 Structure and basic dimensions
Basic parameters of stop lubrication
Working temperature
Expanded allowable load
33.4 Type, type and load characteristics and dimensions of Figure 1, Figure 2 Table 2 Type IA, type AS
Figure 2 Type B, type
Nominal diameter
.23 -.F0
65--13
.oc -- .
[5~·j5i1
Production cubic meter
Nominal pressure Nominal pressure
Mean size
Basic dimensions of A-type, Japanese-type stop check valves
180177
5986477
Basic dimensions of S-type and BS-type stop check valves are shown in Figure T, Figure 2, Table 3.
Nominal pressure
Basic dimensions of AS-type and BS-type stop check valves Table 3
Given the structure
ASAES-type
30C250
.- V24
CB/T 3916—2002
Unit is meter
Main quantity kg
11. 3:2. 3
Unit is millimeter
Three references
CB/T3946—2002
8.4 Marking example
The nominal stop force is ?.5MPa: the nominal diameter is 65r, the flange size and sealing conform to the flange casting standard of G/T569 for bellows pipe recirculation stop valve:
The nominal pressure is 2.EMP, the nominal diameter is 50Mu, the flange connection size and density conform to the standard of GBT2501 for steel strip bellows straight stop stop valve:
Bellows check valve RS25051B/3月4520024 requirements
4. 1 Materials
The required materials for the stop valve are shown in the table.
Table 4 Materials of main parts of stop check valves
Valve body, valve cover
Bellows
4.2 Bellows
Carbon steel
Stainless steel
Stainless steel
4.2.1 The stop check valve shall comply with the requirements of G3/12777. Standards: 27230-4500
CE.T 772-:993
GE/1 659 1859
GA/- 1220-1942
GB7. 4289-199
4.2.2 The connection between the stop check bellows and the mesh rod shall be welded by gas welding, the welding surface shall be smooth and flat, and the welding hoop shall not have defects such as slag and gas.
4.3 Castings
4.3.1 The chemical composition and mechanical properties of the castings shall meet the requirements of 3/772-1998. 4.3.2 Each furnace of castings shall have at least one test piece with the furnace number, and the storage period shall not be less than three years. 4.4 Strength
4.4.1 The pressure strength of the valve should be able to withstand 1.5 times the nominal positive force without melting; 4.4.2 After the bellows is connected to the plunger, its pressure strength should withstand 1.5 times the nominal pressure without leakage; 45 Sealing
The sealing surface of the stop valve should be free of leakage under 1.1 times the nominal pressure; 4.6 Dimensional tolerance
The dimension tolerance of the stop valve should meet the requirements of 3.2, 3.3, 3.10 in GB/T600-1. 4.7 Geometric tolerance
The geometric tolerance of the stop foot should meet the requirements of 3.1 in GB/T600-1991. 4.B Appearance
The external effect of the stop valve should meet the requirements of 3.4~3.9 in CB60W-1991. 5 Test methods
5.1 Bellows
5.1.1 The test of bellows shall be carried out in accordance with GA/712-777: 4.2.1. 4.2.2. 5.1.2 After the bellows is connected to the valve, the test method shall be carried out in accordance with CB/T 3946-2002: 4.2.2. 5.2 Casting test
The chemical composition of the valve body shall be tested in accordance with CB/T 772-1998. 4.3.
5.3 Strength
5.3.1 The test method of the stop check shall be carried out in accordance with the provisions of GB 600-199: 4.2, 4.1.3 and 4.3.1. The result shall comply with the requirements of 4.4.1.
5.3.2 The test method of the stop check shall be carried out in accordance with the test method of the stop check. The holding time shall be 5 minutes and the flow box shall be checked without material or material. The result shall comply with the requirements of 4.4.2: 5.4 Sealing
The test method of the stop check shall be carried out in accordance with B/T600-199141.2.2 and 4.3.The results shall comply with the requirements of 4.5 and 5.5 Dimensions and dimensional tolerances. The dimensions between the two cores shall be tested with single tools of corresponding grades, and the results shall comply with the requirements of 33 and 4. 5.6 Geometric Tolerance
The shape of stop check valves shall be inspected by force measurement and the result shall meet the requirements of 1.7. 5.7 Appearance
The appearance of stop check valves shall be inspected by force measurement and the result shall meet the requirements of 4.8 B Inspection Rules
6.1 Inspection Classification
The inspection of stop check valves shall be divided into type inspection and production inspection; 6.2 Type Inspection
6. 2. 1 Inspection Timing
Type inspection of stop check valves shall be carried out in the following cases: 1. Production appraisal of new products:
When major quality problems occur in the production or process of products: When major quality problems are found during the batch production, the relevant national quality inspection departments shall carry out inspection. Inspection Items
The items of type inspection shall meet the requirements of the table. Table 5 Test items
Tensile performance
Transformation, chemical properties and mechanical properties
Quality
Size and size
Shape and position difference
External test
““ indicates test items are required:
Required, size
9. 3, 1. 6
4.2.2. 4.8
““ indicates no test items are required. bzxz.net
Test method chapter, case number
Type inspection
CB/T 3946-2002
6.2.3 Number of inspection samples
The number of samples for type inspection should not exceed 3.6.2.4 Judgment rules
If all samples meet the requirements, they are judged as qualified for type inspection. If there are items that do not meet the requirements, double sampling is allowed. If there are still items that do not meet the requirements, it is judged as unqualified for type inspection: B.3 Factory inspection
6.3.1 Cut-off and return inspection! 6.3.2 Each test item shall be checked and inspected by the inspection department on a daily basis. The inspection shall be carried out according to the requirements of the manufacturer. 6.3.3 The inspection shall be carried out according to the requirements of the manufacturer. 6.3.3.1 All the items shall be checked and inspected according to the requirements of the manufacturer. 6.3.3.2 If the chemical composition and mechanical properties of the casting do not meet the requirements, it shall be judged as unqualified. 6.3.3.3 For other single tests, if there are any failures in meeting the requirements, the test shall be conducted again after repair. If the failures in meeting the requirements, the test shall be judged as unqualified. 7.1 The marking of the test shall be in accordance with the provisions of GB/3032. 7.2 The packaging of the test shall be in accordance with the provisions of 6.2-6.4 of GB600-1991. CB/T3946-2002 Modification List
1.1.6 is changed to "The tightness between the upper and lower reading footplates and the reading seat should not be less than 1.=1.4a under the wave pressure of nominal pressure and 4a."
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