Some standard content:
ICS 27.060
Machinery Industry Standard of the People's Republic of China
JB/T 3595—2002
Replaces JB/T3595-1993
Valves for power stationgeneral requirements2002-07-16Issued
2002-12-01Implemented
Issued by the State Economic and Trade Commission of the People's Republic of ChinaForeword
Scope,
Normative references
3 Terms and definitions
4 Ordering requirements
5 Pressure and temperature grades
6 Technical requirements
General requirements
6.3 Design.
6.5 Repair welding.
7 Inspection and testing.
7.． Material inspection...
7.2 Appearance quality inspection
7.3 Radiographic inspection
Magnetic particle or penetrant inspection
Assembly and performance inspection,
7.6 Pressure test,
8 Marking, packaging, storage and transportation
8.3 Storage,
8.4 Transportation,
9 Delivery documents
Appendix A (Informative Appendix) Ordering requirements
Appendix B (Normative Appendix) Pressure and temperature grade table
Appendix C (Normative Appendix) Maximum operating temperature of shell pressure-bearing parts materials.Appendix D (Informative Appendix) Valve sealing surface cladding materials and hardness.Appendix E (Informative Appendix) Valve body channel end butt weld groove typeAppendix F (Informative Appendix) Metal nameplate.Appendix G (Informative Appendix) Basic contents of product certificateAppendix H (Informative Appendix) Contents of product packing listAppendix I (Informative Appendix) Main contents of product installation and operating instructions, Figure 1 Transillumination range.
Figure E.1 V-shaped groove type.
Figure E.2 U-shaped groove type.
Figure E.3 U (1) groove type
JB/T 3595--2002
JB/T 3595—2002www.bzxz.net
Table 1 Residual height value after cutting off the pouring riser of steel castingsTable 2 Duration of pressure test,
Table A.1 Basic ordering requirements,
Table A.2 Special ordering requirements
Table B.1 Pressure-temperature grades of steel valves with nominal pressure of 0.1MPa, Pressure-temperature grades of steel valves with nominal pressure of 0.25MPa.Table B.2
Pressure-temperature grades of steel valves with nominal pressure of 0.4MPa. Table B.3
Table B.4 Pressure-temperature ratings for steel valves with a nominal pressure of 0.6 MPa. Table B.5 Pressure-temperature ratings for steel valves with a nominal pressure of 1.0 MPa. Table B.6 Pressure-temperature ratings for steel valves with a nominal pressure of 1.6 MPa. Table B.7
Pressure-temperature ratings for steel valves with a nominal pressure of 2.5 MPa. Table B.8
Table B.9 Pressure-temperature ratings for steel valves with a nominal pressure of 6. Pressure-temperature grades for steel valves with a nominal pressure of 3MPa. Table B.10 Pressure-temperature grades for steel valves with a nominal pressure of 10.0MPa. Table B.11
Pressure-temperature grades for steel valves with a nominal pressure of 16.0MPa Pressure-temperature grades for steel valves with a nominal pressure of 20.0MPa Pressure-temperature grades for steel valves with a nominal pressure of 25.0MPa. Table B.13
Pressure-temperature grades for steel valves with a nominal pressure of 32.0MPa. Table B.142
Pressure-temperature grades for steel valves with a nominal pressure of 42.0MPa Table B.16
Pressure-temperature grades for steel valves with a nominal pressure of 50.0MPa Pressure-temperature grades for steel valves with a nominal pressure of 63.0MPa. Table B.18 Pressure-temperature grades for materials WCB Table B.19 Pressure-temperature grades for materials WC1 Table B.20 Pressure-temperature grades for WC6 material Table B.21 Pressure-temperature grades for WC9 material Table C.1 Maximum operating temperature of shell pressure-bearing parts material. Table D.1
Valve sealing surface cladding materials and cladding hardness Table E.1 Additional value of butt weld groove size D2. Table F.1
Metal nameplates for stop valves, check valves, gate valves, throttle valves, plug valves, etc. Metal nameplates for regulating valves.
Metal nameplates for safety valves.
Metal nameplates for pressure reducing valves…
Metal nameplates for temperature-reducing and pressure reducing valves
Basic contents of product certificates.
Basic contents of safety valve product certificate
Basic contents of regulating valve product certificate
Table H.1 Contents of product packing list,
Table I.1 Main contents of product installation and operating instructions..6
This standard replaces JB/T3595--1993 "Technical Conditions for Power Station Valves". Compared with JB/T3595-1993, the main changes of this standard are as follows: JB/T3595-2002
-The name of the standard has been changed (the 1993 version is "Technical Conditions for Power Plant Valves"; this version is "General Requirements for Power Plant Valves"); the applicable scope of valves has been expanded from subcritical parameters to supercritical parameters (Chapter 1 of the 1993 version; Chapter 1 of this version); the "Terms and Definitions" chapter has been added (Chapter 3 of this version); - The "Ordering Requirements" chapter has been added (Chapter 4 and Appendix A of this version); the pressure and temperature grade table has been modified, the temperature and pressure values of the ZG200-400 pressure range PN≥6.3MPa have been deleted, and the temperature and pressure values of "WCB, WC1, WC6, WC9" materials have been added according to the Japanese E101 standard (Chapter 3 and Table 1 of the 1993 version; Chapter 5 and Appendix B of this version);
In Chapter 6, the manufacturing requirements clause (4.3 of the 1993 edition) was deleted; welding content was added (6.4 of this edition); repair welding content was added (6.5 of this edition); - Material inspection requirements were added (7.1 of this edition); - Appearance quality inspection requirements were added (7.2 of this edition); - Assembly and performance inspection requirements were added (7.5 of this edition); - Normative Appendix "Maximum use temperature of shell pressure-bearing parts materials" (Appendix C of this edition) was added; - Informative Appendix "Valve sealing surface cladding materials and hardness" (Appendix D of this edition) was added; - Informative Appendix "Metal nameplate" (Appendix F of this edition) was added; - Informative Appendix "Basic contents of product certificate" (Appendix G of this edition) was added; Informative Appendix "Main contents of product installation and operation manual" (Appendix I of this edition) was added. Appendices B and C of this standard are normative appendices, and Appendices A, D, E, F, G, H, and I are informative appendices. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Boiler Standardization (CSBTS/TC73). The drafting unit of this standard is Wuhan Boiler Group Valve Co., Ltd.; the participating drafting units are Harbin Boiler Factory Co., Ltd., Dongfang Boiler (Group) Co., Ltd./Dongfang Boiler Valve Co., Ltd., Qingdao Power Plant Valve Factory, and Shanghai Power Equipment Co., Ltd. The main drafters of this standard are Zhang Hanlin, Lv Zhaozheng, Feng Yan, Liu Zhengjun, Long Jiannan, and Zhong Lisheng. The previous versions of the standards replaced by this standard are: -JB3595-1984, JB/T3595-1993. III
1 Scope
General requirements for power station valves
JB/T 3595-2002
This standard specifies the general requirements for pressure and temperature grades and materials, design, inspection, marking, packaging, storage, transportation, and delivery documents of power station valves, and provides guidance on ordering requirements. This standard applies to all kinds of valves used in steam-water systems of power stations under the following parameter conditions: - nominal pressure not more than 42MPa, maximum working temperature not more than 450℃; - working pressure not more than 26MPa, maximum working temperature not more than 540℃; - working pressure not more than 6MPa, maximum working temperature not more than 570℃. 2 Normative references 1)
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions apply to this standard. GB/T3323-1987 Radiography and quality classification of steel fusion welded butt joints GB/T3985 Asbestos rubber sheet
GB/T4213-1992 Pneumatic control valve
GB/T4622.1~~3 Spiral wound gasket
5 Radiography and film grade classification method for steel castings GB/T 5677—1985
GB/T 6414-1999
GB/T 9112—1988
Dimensional tolerances and machining allowances of castings (eqvISO8062:1994) Types and parameters of steel pipe flanges
GB/T9113.1~26-1988 Integral steel pipe flanges GB/T9115.1~36—1988 Butt-welded steel pipe flanges Method for rating of steel castings by penetrant testing and defect display marks GB/T 9443—1988
GB/T 9444-1988
Method for magnetic particle testing and quality rating of steel castings Technical conditions for power station temperature reduction and pressure relief valves
GB/T 10868---1989
, technical conditions of power station regulating valve
GB/T 10869--1989
GB/T 12221—1989
GB/T 12222--1989
GB/T 12223—1989
GB/T 12224---1989
GB/T 12225-1989
GB/T 122301989
GB/T 12234—1989
GB/T 12235—1989
GB/T 12236--1989
GB/T 12237--1989
GB/T 12241—1989
Structural length of flange-connected metal valves (neqISO5752:1982)Connection of multi-turn valve drive devices (idtISO5210-15210-3:1982)Connection of part-turn valve drive devices (idtISO5211-1~5211-3:1982)General requirements for steel valves (negANSI B16.34:1981)Technical conditions for copper alloy castings for general valves
Technical conditions for austenitic steel castings for general valvesFlanges and butt-welding steel valves for general valvesFlanges for steel stop valves and lift check valves for general valvesSteel swing check valves for general valves
Flanges and butt-welding steel ball valves for general valvesSafety valves - General requirements (eqvISO4126:1984)1) When the referenced documents do not cover subcritical and supercritical parameters, these documents are for reference only. 1
JB/T 3595-2002
GB/T 12242-1989
Safety valve performance test method (neqANSIASTMPTC25.3:1976)GB/T12243-1989 Spring direct load safety valve (neqJISB8210:1978)GB/T12244-1989 General requirements for pressure reducing valves
GB/T 12245-1989 Pressure reducing valve performance test methodGB/T12246-1989 Pilot-operated pressure reducing valve
GB/T15188.1~4-1994 Structural length of valvesJB/T74-1994 Technical conditions for pipeline flanges (neq DIN2535～2547、DIN2573～2637）JB/T106 Valve marking and identification paint
JB/T1613-1993 Technical conditions for welding of boiler pressure componentsJB/T2203-1999 Structural length of spring-loaded safety valveJB/T2205-2000 Structural length of pressure reducing valveJB/T4018 Method for compiling power station valve modelsJB/T5263-1991 Technical conditions for steel castings of power station valves (negANSVASTMA217M)JB/T 6900—1993
Drain valve
JB/T7370Flexible graphite braided packing
JB/T7927—1999Appearance quality requirements for valve castingsJB/T8219—1999Electric actuators for industrial process measurement and control systemsJB/T8528-1997Technical conditions for common valve electric devicesJB/T 8529—1997
Technical conditions for explosion-proof valve electric devices
JB/T9624—1999Technical conditions for power station safety valvesJB/T9625—1999Technical conditions for pressure-bearing steel castings for boiler pipe accessoriesJB/T9626—1999Technical conditions for boiler forgingsJC/T67Rubber asbestos packing
JC/T68Oil-immersed asbestos packing
SDGJ6—1990Technical regulations for stress calculation of steam-water pipelines in thermal power plants3 Terms and definitions
The following terms and definitions apply to this standard. Pressure-temperature ratingpressure-temperature ratingThe maximum allowable working pressure expressed in gauge pressure at the specified working temperature for the selected material. 4 Ordering requirements
To facilitate the buyer's ordering, Table A.1 in Appendix A provides a guide to basic ordering requirements for reference, and Table A.2 provides a guide to special ordering requirements for buyers for different types of valves. 5 Pressure-temperature rating
For the pressure-temperature rating of various materials, see the provisions of Appendix B. 6 Technical requirements
6.1 General requirements
6.1.1 The design of valves shall meet the requirements of safety and reliability. 6.1.2 In addition to meeting the requirements of this standard, power station valves shall also meet the provisions of the following relevant standards: a) Steel valves shall meet the provisions of GB/T12224-1989; 2
b) Gate valves shall meet the provisions of GB/T12234-1989; stop valves and check valves shall meet the provisions of GB/T12235-1989. 9 and GB/T12236-1989; c)
d) Ball valves shall comply with the provisions of GB/T12237-1989; JB/T3595--2002
Safety valves shall comply with the provisions of GB/T12241-1989, GB/T12242-1989, GB/T12243-1989 and JB/T9624-1999 e)
:
Pressure reducing valves shall comply with G The temperature and pressure reducing valve shall comply with the provisions of GB/T10868-1989. The regulating valve shall comply with the provisions of GB/T10869-1989. The drain valve shall comply with the provisions of JB/T6900-1993. The valve electric device shall comply with the provisions of JB/T8528-1997 or J B/T8529-1997 regulations: j
Electric valve actuators shall comply with the provisions of JB/T8219-1999 k))
Pneumatic valve actuators shall comply with the provisions of GB/T4213--1992, 1
6.1.3When new technologies (such as new structures, new materials, new processes, etc.) are adopted and the technical requirements of this standard are not covered, necessary tests shall be carried out or qualified after identification and approval by the buyer before they can be adopted. 6.2 Materials
6.2.1Valve materials shall be selected according to the use conditions and manufacturing requirements; the materials of fasteners such as bolts and nuts shall be selected according to the use pressure and temperature. When selecting the material of the shell pressure-bearing parts, the maximum use temperature shall be in accordance with the provisions of Appendix C. For the selection guide of sealing surface cladding materials and cladding hardness, please refer to Appendix D.
6.2.2The materials and welding materials selected for valve pressure-bearing parts shall comply with the material standards specified in the relevant national standards, industry standards or order contracts. The material manufacturing unit must ensure the quality of the materials and provide a quality certificate. Metal materials and weld metals should have the specified strength, toughness and elongation as well as good fatigue resistance and corrosion resistance under the conditions of use. 6.2.3 Steel castings should comply with the provisions of JB/T9625-1999 or JB/T5263-1991. 6.2.4 Forgings should comply with the provisions of JB/T9626-1999. 6.2.5 Austenitic steel castings should comply with the provisions of GB/T122301989. 6.2.6 Copper alloy castings should comply with the provisions of GB/T12225-1989. 6.2.7 Rubber asbestos gaskets should comply with the provisions of JC/T67. 6.2.8 Oil-impregnated asbestos gaskets should comply with the provisions of JC/T68. 6.2.9 Flexible graphite braided packing should comply with the provisions of JB/T7370. 6.2.10 Asbestos rubber sheets shall comply with the provisions of GB/T3985. Wound gaskets shall comply with the provisions of GB/T4622.1~3. 6.2.11
6.2.12 Material substitution shall meet the requirements of strength and structure, and shall be permitted only with the approval of the design department of the product. 6.3 Design
6.3.1 This standard sets forth the minimum or most basic requirements for valve design, but it is not all the requirements for design. 6.3.2 The valve design shall comply with the relevant provisions of the "Regulations on Safety Technical Supervision of Steam Boilers". 6.3.3 The valve design shall meet the ordering requirements proposed by the buyer, and the minimum wall thickness of the pressure-bearing parts shall meet the requirements for safe use. The valve design shall take into account the requirements of the system or device in which the valve is located. 6.3.4
6.3.5 Measures to reduce noise shall be considered when designing the valve. 6.3.6 The flange connection dimensions and sealing surface types shall comply with the relevant provisions of GB/T9112-1988 or GB/T9113.1~26--1988 or JB/T74--1994.
6.3.7 If the buyer does not specify otherwise, the type of the welding grooves at both ends of the valve body should refer to Appendix E. 6.3.8 The structural length shall comply with the following relevant standards unless otherwise specified by the buyer: a) When both ends of the valve channel are flanged, its structural length shall comply with the provisions of GB/T12221-1989; 3
JB/T3595-—2002
b) The structural length of valves with butt welding connection, butt clamp connection, internal thread and external thread connection shall comply with the provisions of GB/T15188.1~4-1994;
c) The structural length of spring safety valves shall comply with the provisions of JB/T2203-1999; d) The structural length of pressure reducing valves shall comply with the provisions of JB/T2205-2000. 6.3.9 The connection dimensions between the valve drive and the valve shall comply with the provisions of GB/T12222-1989 or GB/T12223-1989. 6.4 Welding
Welding of pressure-bearing parts and forged welding structures shall comply with the provisions of JB/T1613-1993. 6.5 Repair welding
6.5.1 Repair welding of defects of pressure-bearing parts includes repair welding of local defects, inlay repair welding of local areas and digging of local defects of welds. Repair welding work shall be carried out by welders who have passed the examination according to the repair welding process that has been evaluated as qualified. The number of repair welding on the same part shall not exceed 3 times. 6.5.2 When the depth of the pit after the defect is removed exceeds 20% of the minimum wall thickness or 25mm, whichever is smaller, or its area is equal to or exceeds 65cm2, a special repair welding process shall be formulated; when the average depth of the defect exceeds 1/3 of the wall thickness or the area exceeds 100cm2, in addition to formulating a special repair welding process, it shall also be approved by the technical person in charge of the manufacturing unit. 6.5.3 The repaired parts shall not have defects such as cracks, slag inclusions or weld nodules. The non-destructive testing method, acceptance standard and post-weld heat treatment requirements after repair welding are the same as those before repair welding. Those that fail to meet the requirements shall be scrapped. 6.5.4 After repair welding, the pressure-bearing parts shall be re-heat treated to eliminate stress in accordance with relevant regulations. Alloy steel castings or carbon steel castings with large-area repair welding shall be heat treated to improve the grain of the heat-affected zone. If the material technical conditions require it, austenitic stainless steel shall be solution treated after repair welding. 6.5.5 The following types of defects are not allowed to be repaired and shall be scrapped. a) Defects such as sand holes, slag inclusions, pores, shrinkage, and through cracks that involve a wide area and cannot be cleaned. b) The location cannot be repaired or the quality cannot be guaranteed after repair welding or effective inspection methods cannot be adopted. c) Defects found after fine processing, the quality of which cannot be guaranteed after repair welding. 7 Inspection and Test
7.1 Material Inspection
7.1.1 Materials for valves shall have material certificates or relevant certificates; metal materials shall have steel grade, furnace number and batch number, and chemical composition and mechanical properties certificates.
7.1.2 Pressure-bearing parts shall be sampled and inspected before entering the warehouse. The chemical composition shall be sampled according to the smelting furnace, and the mechanical properties shall be sampled according to the heat treatment batch. The inspection results shall comply with the provisions of the corresponding material standards. 7.1.3 When a certain mechanical property index of a sample in the sampling inspection results of pressure-bearing parts is unqualified, double the number of samples shall be taken for re-testing. If there is still one unqualified, this batch of parts shall be re-heat treated. The re-testing method is the same as before. The number of re-heat treatments shall not exceed two times (excluding the number of tempering times). If there is still one unqualified sample in the last re-test, this batch of materials cannot be put into use. When the chemical composition index of a sample in the sampling inspection results is unqualified but the mechanical property index of the sample is qualified, the disposal measures shall be determined according to the specific situation or the provisions of the material procurement contract.
7.2 Appearance quality inspection
7.2.1 The appearance quality of valve steel castings shall comply with the provisions of JB/T7927-1999. 7.2.2 The dimensional tolerance of castings shall comply with the provisions of GB/T6414--1999, but negative deviation is not allowed in the wall thickness of the pressure-bearing part of the casting; the pouring and rising heads shall be cut off according to the prescribed gas cutting process, and the residual height after cutting shall not exceed the provisions of Table 1. Table 1 Residual height of steel castings after removal of pouring and riser Unit: mm
Cutting part
Non-machined surface
Machinery surface
Hot removal
Cold removal
≤120
Width or diameter of pouring and riser
120~200
201～350
JB/T3595--2002
7.2.3 The pouring and riser can be leveled by mechanical processing. When it is at the intersection of the arc of the flow part, it can be polished with a grinding wheel and smoothly transitioned with the body surface. After eliminating the pouring and riser, excess meat and core sand, heat treatment should be carried out according to the process regulations. After heat treatment, sandblasting should be carried out to eliminate oxide scale, sticky sand and burrs.
7.2.4 Cast steel pressure-bearing parts are not allowed to have inlays (chill iron, core support, etc.). 7.2.5 The welding groove of the valve body, the welded part of the valve seat, the contact between the valve body and the self-sealing ring, and the part connected to the threaded surface of the valve body are not allowed to have defects.
7.2.6 Cast steel parts should not have defects such as pores, shrinkage cavities, shrinkage, sand inclusions and cracks. 7.2.7 The outer surface of forgings is not allowed to have defects such as cracks, folds, forging scratches, scars, slag inclusions, etc. For surfaces that need to be processed, if the above defects exist but are not completely removed after processing, they are allowed to be used only after approval by the technical department. 7.3 Radiographic inspection
7.3.1 Inspection parts
7.3.1.1 The groove of the valve body of the cast steel parts that are welded to the pipeline that meets any of the following conditions shall be radiographically inspected. The range of the radiographic inspection is 1.5t or 50mm from the end face of the groove, whichever is smaller, as shown in Figure 1. a) Pipes with an outer diameter greater than 426mm (water pipes greater than 273mm) and a wall thickness greater than 20mm: b) Pipes with a wall thickness greater than 40mm (water pipes greater than 30mm) and an outer diameter greater than 159mm. Transillumination range
1—valve body; 2—pipe.
Dw Outer diameter of the pipe: Wall thickness of the pipe connected to the valve. Figure 1 Transillumination range
7.3.1.2 Butt weld of the valve.
7.3.1.3 Parts that need to be radiographically inspected after repair welding. 7.3.2 Inspection timing, method and acceptance criteria 7.3.2.1 Radiographic inspection of grooves is generally carried out before groove processing. 7.3.2.2 The radiographic inspection method for the grooves and repair welding parts of cast steel valves shall comply with the provisions of Class A in GB/T5677-1985. The radiographic inspection method for valve butt welds shall comply with the AB grade regulations in GB/T3323-1987. 7.3.2.3 The bevel and repair welded parts of cast steel valves shall be evaluated according to GB/T5677-1985, and the third grade shall be qualified. The butt welds of valves shall be evaluated according to GB/T3323-1987, and the second grade shall be qualified. 7.4 Magnetic particle or penetrant inspection
7.4.1 Inspection parts
7.4.1.1 The parting surface, pouring and riser, stress concentration area, intersection of different curved surfaces and parts with doubtful quality of alloy steel valve body. 7.4.1.2 The bevel surface of alloy steel cast steel valve body. 7.4.1.3 The fillet weld on the pressure-bearing part of the valve. 7.4.1.4 The parts of the shell and other parts that need magnetic particle or penetrant inspection after repair welding. 7.4.1.5 Overlay welding sealing surface of steam valves with nominal pressure PN≥10MPa or working temperature t≥450℃. The number of sampling tests in each batch of valves is:
JB/T 3595-2002
a) For DN≥50mm, it is 100% of the total number of valves in the batch. b) For DN<50mm, it is not less than 5% of the valves in the batch, but not less than one. If there is one unqualified in the first sampling test, double sampling test should be carried out for the second sampling test: If there is still unqualified in the second sampling test, each product should be tested one by one. 7.4.2 Testing time, method and acceptance standard 7.4.2.1 For parts that need to be machined, magnetic particle or penetration testing should be carried out after the final machining. 7.4.2.2 The magnetic particle testing method should comply with the relevant provisions of GB/T9444-1988. The penetration testing method should comply with the relevant provisions of GB/T9443-1988.
7.4.2.3 The parts requiring magnetic particle or penetrant testing and the sealing surface of the valve shall be in accordance with 7.4.2 of this standard.2. The corresponding standards specified in the regulations shall be evaluated and accepted, and the third level shall be qualified.
7.5 Assembly and performance inspection
7.5.1 All parts of the valve shall be inspected by the quality inspection department before assembly, and unqualified parts shall not be assembled. Alloy steel parts shall be 100% spectrally inspected and marked to ensure that they are not confused with parts of other materials. 7.5.2 The sealing surface shall be guaranteed to have sufficient hardness, according to the design drawings or refer to Appendix D. The sealing surface after grinding is not allowed to have cracks, depressions, pores, spots, scratches, marks and other defects. The sealing surface shall ensure that the radial fit is not less than 80%. 7.5.3 The threaded connection surface of the fastener, the surface of the asbestos rubber sheet and the sealing gasket shall be coated with molybdenum disulfide grease (paste) or a coating of equivalent effect during assembly to prevent biting. 7.5.4 The valve shall be assembled and debugged strictly according to the drawings and relevant technical documents, and the movement shall be flexible without any blocking. 7.5.5 The stroke of the whole valve shall be checked. Electric valves should be debugged for stroke protection and torque protection to ensure that all mechanisms for stroke and torque protection operate reliably and accurately. The pointer position on valves such as regulating valves, pressure reducing valves, throttle valves, butterfly valves, etc. should be consistent with the position of the actual valve disc opening. 7.5.6 The valves of the whole machine should be subjected to pressure strength test and sealing test one by one. However, for integral forged valves with a nominal diameter of DN≤50mm, sampling strength test can be carried out under the condition of mature production technology and stable product quality. The sampling quantity is 10%~15%, but not less than 5: if there is one unqualified after the sampling test, double sampling should be carried out for retesting. If there is still one unqualified, strength test should be carried out one by one. 7.5.7 All valve bodies that have been repaired by welding should be retested for strength, and the test should be carried out after repairing welding and heat treatment. For shells that need non-destructive testing, it should be carried out after non-destructive testing. 7.6 Pressure test
7.6.1 Except for the order requirements, the valve shall not be painted or treated with anti-corrosion chemicals or use anti-leakage coating before the test, and the valve body shall be clean.
7.6.2 The test equipment shall be equipped with two calibrated pressure gauges, the range shall be 1.5 to 3 times the test pressure, and the accuracy of the pressure gauge shall not be lower than Class 1.5. 7.6.3 The test medium shall be clean water at 5℃ to 50℃ (rust inhibitor may be added), kerosene or other suitable liquids with a viscosity not greater than that of water. When filling the medium, the gas in the valve body shall be removed. 7.6.4 The test pressure of the pressure seal shall be 1.1 times the nominal pressure; if the pressure seal test is carried out according to the working pressure, it shall be 1.25 times the working pressure. For the strength test pressure, refer to Appendix B of this standard or take 1.5 times the nominal pressure. It is allowed to convert the working pressure into the corresponding nominal pressure and take 1.5 times for strength test. Safety valves shall comply with the provisions of GB/T12242-1989 and JB/T9624-1999. The test pressure values for sealing test and strength test shall be indicated on the design drawings. 7.6.5 During the test, the pressure shall be gradually increased to the required value specified in 7.6.4 of this standard. A sudden and sharp increase in pressure is not allowed. The test duration of the pressure test shall comply with the provisions of Table 2.
Table 2 Duration of pressure test
Nominal diameter mm
DN≤125
150≤DN≤400
DN≥500
Strength test time min
Note: The test duration refers to the inspection time of the valve at full load pressure after it is fully prepared6
Sealing test time min
JB/T 3595--2002
7.6.6 During the specified test duration, the pressure should remain unchanged. If any abnormality is found during the test, the test is invalid. After the cause is found, the test shall be repeated according to the above requirements. During the test, no external force that affects the test results is allowed to be applied to the valve. 7.6.7 During the strength test, after the specified test duration is reached, the valve is not allowed to have visible leakage. 7.6.8 During the pressure seal test, the permissible leakage shall meet the following requirements within the specified test duration: a) The leakage between the sealing surfaces of the shut-off valves mainly used to cut off or connect the medium flow shall not exceed 0.01 DNmL/min; b) The leakage of the check valve shall not exceed 0.03 DNmL/min. 7.6.9 After the test, the valves shall be treated with anti-corrosion and the inner cavity shall be coated with anti-rust coating. If the valves in stock are sampled, the anti-rust coating on the sealing surface shall be removed.
8 Marking, packaging, storage and transportation
8.1 Marking
8.1.1 The method for compiling product models shall be in accordance with the provisions of JB/T4018. When the shell is made of WCB, WC1, WC6, and WC9 materials, the valve product model shall be compiled in accordance with the methods specified in JB/T4018 for carbon steel and chromium-molybdenum-vanadium alloy steel materials. 8.1.2 When the valve body is made of WCB, WC1, WC6, or WC9, the brand number can be marked on the valve body. 8.1.3 Qualified valve products should be equipped with metal nameplates, and the binding position and size of the nameplates should be in accordance with the design drawings. For the content of the nameplate, please refer to Appendix F. 8.1.4 Important parts and pressure-bearing welds that have passed the inspection should be directly numbered or marked. The markings should be placed in the area with the least stress, especially avoiding stress concentration areas, shape mutations, and welding heat-affected areas, and should not hinder the determination of non-destructive testing results. 8.1.5 The marking and identification paint of the valve shall comply with the provisions of JB/T106. For valve bodies made of WCB, the identification paint shall refer to the provisions of carbon steel materials; for valve bodies made of WC1, WC6, or WC9, the identification paint shall refer to the provisions of alloy steel materials. The color of the paint may be changed according to the requirements of the buyer. Other markings shall be implemented in accordance with relevant standards. 8.2 Packaging
8.2.1 Before packaging, the valves shall be painted according to the provisions of 8.1.5. The unpainted parts or the processed surfaces without anti-rust layer shall be coated with anti-rust oil. 8.2.2 The flange sealing surfaces, welding ends, threaded ends and the inner cavity of the valves shall be protected by plugs or covers, etc., and shall be easy to install and disassemble. 8.2.3 The valve products shall be packed and shipped according to the packing list; for valves with larger volume, they may be packed naked according to the order requirements, but they shall be guaranteed not to be damaged during transportation.
8.3 Storage
Valve products shall be stored in a dry and ventilated room and stacked neatly as required. It is not allowed to store or stack products in the open air. 8.4 Transportation
8.4.1 During transportation, the valve disc shall be in the closed state, the check valve disc shall be fixed and motionless; the plug valve shall be in the open position; the weight of the lever valve shall be removed from the lever, placed separately, and the lever shall be fixed. The side flanges at both ends of the valve channel or the welding grooves of the branch pipes shall be blocked with covers or plugs to prevent the intrusion of dust, dirt and sewage. 8.4.2 The exposed part of the valve stem shall be protected. 9 Delivery documents
The delivery documents include product certificates, product packing lists, and product installation and operating instructions. The basic contents are shown in Appendix G, Appendix H, and Appendix I respectively.
JB/T3595—2002
Appendix A
(Informative Appendix)
Ordering requirements
A.1 Table A.1 provides a guide to basic ordering requirements for buyers. Table A.1 Basic ordering requirements
Buyer name
Valve name
Valve purpose
Nominal pressure MPa
Maximum working temperature
Working medium
Valve structure type
Valve structure length
Drive Actuation mode
Connection mode
Inlet end
Connection mode
Outlet end
Valve additional bypass valve
Special requirements for packing
Valve supply status
Execution standard
Valve model
Working pressure MPa
Liquid medium port
Gas medium port
True through port
Angle port
See JB/T3595--2002
6.3.8Related standards
Manual
Pneumatic
Butt welding
Flush handwheel
Side-mounted handwheel
Ordinary
Explosion-proof
Pipe size and welding groove type"
Pipe material:
Butt welding
Pipe size and welding groove type\:
Pipe material:
Required
Name of bypass valve
Model and specification
Complete machine delivery
Others:
Direct current
Special requirements
Minimum operating temperature
Distance from the center of the handwheel to the center line of the valve channelDistance from the center of the handwheel to the center line of the valve channelGB/T 12223--1989
Connection size
GB/T12222-1989
Special requirements:
Socket welding connection
Socket welding connection
No need for port
Need to be disassembled on site■
No need to be disassembled on site
JB/T3595-—2002 "Power Station Valves
General Requirements"
Welding grooves refer to JB/T3595-2 002 Appendix E or by the manufacturing department in accordance with relevant standards. b If the order is not specially specified, the flange gasket is not included in the scope of supply of valve parts. 9
Quantity
Nominal diameter
Medium composition
Flange connection
Concave and convex surface:
Flat flange surface:
Others:
Flange connection
Concave and convex surface:
Flat flange surface:
Others:
Special requirements:
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