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GB/T 19672-2021 English PDF

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US$779.00 · In stock
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GB/T 19672-2021: Pipeline valves - Technical specification
Status: Valid

GB/T 19672: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 19672-2021	779	Add to Cart	6 days	Pipeline valves - Technical specification	Valid
GB/T 19672-2005	RFQ	ASK	6 days	Specification of pipeline valves	Obsolete

Similar standards

GB/T 15185 GB/T 21384 GB/T 24921.1 GB/T 45161 GB/T 44519

Basic data

Standard ID: GB/T 19672-2021 (GB/T19672-2021)
Description (Translated English): Pipeline valves - Technical specification
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J16
Word Count Estimation: 42,465
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 19672-2021: Pipeline valves - Technical specification

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Pipeline valves - Technical specification ICS 23.060.01 CCSJ16 National Standards of People's Republic of China Replace GB/T 19672-2005 Technical conditions of pipeline valves Released on 2021-03-09 2021-10-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Preface Ⅴ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Structural type and size parameters 2 4.1 Structure type 2 4.2 The flow channel size of the valve 3 4.3 The structural length of the valve 3 4.4 Shell wall thickness 4 5 Ordering requirements 5 6 Technical requirements 5 6.1 Pressure-temperature ratings 5 6.2 Valve working pressure and temperature 5 6.3 Connection end of valve and pipeline 5 6.4 Valve operation 5 6.5 Flow coefficient 5 6.6 Bolting of the shell 5 6.7 Relief of pressure in the cavity of the valve body 6 6.8 Bypass, bleed and vent interface 6 6.9 Stem blow-out prevention structure 6 6.10 Grease 6 6.11 Handwheel and wrench 6 6.12 Drive device 7 6.13 Valve opening indication 7 6.14 Locking device 7 6.15 Sealing of stem stuffing box and operating mechanism 7 6.16 Strength design of drive chain parts 7 6.17 Lifting eyes 8 6.18 Static electricity conducting device 8 6.19 Fire resistance test 8 7 Materials 8 7.1 Valve housing material 8 7.2 Material of connecting bolts and nuts 9 7.3 Non-metallic materials 9 7.4 Low temperature material performance requirements 9 7.5 Welding of valves 9 7.6 Hardness requirements 10 8 Inspection rules 10 8.1 Factory inspection 10 8.2 Type test 10 9 Test method 11 9.1 General 11 9.2 Shell test 12 9.3 Upper sealing test 12 9.4 Seal test 12 9.5 Installation of valve body cavity interface after pressure test 13 9.6 Static electricity test 13 9.7 Detection of operating torque or thrust 13 10 logo 13 Appendix A (Informative) Valve Structure 15 Appendix B (Normative) The structural length of the valve 22 Appendix C (Informative) Order Contract Data Sheet 34 Figure 1 Sample location of weldment metal parts 10 Figure 2 The location of the sample in the heat-affected zone 10 Figure A.1 Three-piece structure ball valve 15 Figure A.2 Welded body structure ball valve 16 Figure A.3 Flat single gate valve 17 Figure A.4 Flat double gate valve 18 Figure A.5 Plug valve 19 Figure A.6 Full-diameter swing check valve 19 Figure A.7 Single wafer wafer check valve 20 Figure A.8 Double flap wafer check valve 20 Figure A.9 Axial flow check valve 21 Table 1 The minimum flow channel diameter of the valve 3 Table 2 Minimum thread size of bypass, venting and venting ports 6 Table 3 Material Table 8 of Main Parts Table 4 Charpy V-notch impact requirements (full-size samples) 9 Table 5 Inspection items 11 Table 6 Duration of maintaining test pressure 12 Table B.1 The structural length of the ball valve 22 Table B.2 Structure length of short series ball valve 24 Table B.3 Structure length of gate valve 24 Table B.4 The structural length of the plug valve 26 Table B.5 Structural length of swing check valve 30 Table B.6 Structure length of single and double wafer check valve 31 Table B.7 The structural length of axial flow check valve 32 Table C.1 Valve Order Contract Data Table 34 Technical conditions of pipeline valves

1 Scope

This document specifies the terms and definitions, structural type and size parameters, ordering requirements, Technical requirements, materials, inspection rules, test methods, signs. This document applies to the nominal pressure PN20~PN400, the nominal size is not greater than DN1500, and the pressure level is Class150~ Class2500, ball valves, gate valves, plug valves and check valves for pipeline systems with a nominal size not greater than NPS60. This document does not apply to valves for subsea pipeline systems.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 150.3 Pressure Vessel Part 3.Design GB/T 150.4 Pressure Vessel Part 4.Manufacturing, Inspection and Acceptance GB/T 196 Basic size of ordinary thread GB/T 229 Charpy pendulum impact test method for metallic materials GB/T 699 High-quality carbon structural steel GB/T 1220 stainless steel rod GB/T 7306 (all parts) 55° sealed pipe thread GB/T 9124 (all parts) steel pipe flanges GB/T 12222 Multi-turn valve drive connection GB/T 12223 Part-turn valve drive connection GB/T 12224 General requirements for steel valves GB/T 12228 Technical requirements for carbon steel forgings for general purpose valves GB/T 12229 General Valve Carbon Steel Casting Technical Conditions GB/T 12230 General Valve Stainless Steel Casting Technical Conditions GB/T 13927-2008 Industrial valve pressure test GB/T 20972 (all parts) Materials used in hydrogen sulfide-containing environments in oil and gas exploration in the petroleum and natural gas industry GB/T 26479 Fire resistance test of elastic sealing part-turn valve GB/T 26482 Check valve fire resistance test JB/T 7248 Technical Conditions of Low Temperature Steel Castings for Valves SY/T 7024 Technical specification for on-site hardness inspection of metal materials in high hydrogen sulfide fields ISO 10497 valve test fire test requirements (Testing of valves-Firetype-testing requirements)

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Full diameter valve fulopeningvalve When fully open, all flow passages are circular, and the inner diameter of the flow passage is the same as that of the pipe. 3.2 Reducedopeningvalve When fully open, the flow passage is circular, the inner diameter of the flow passage at the valve connection end is the same as the inner diameter of the pipe, and the inner diameter of the flow passage at the opening and closing part is reduced. 3.3 Reduced valve reducedborevalve The connecting end of the valve body and the pipeline is circular, and the flow passage in the valve body is a rectangular or trapezoidal valve. Example. Stopcock. 3.4 Double-block-and-bleed valve; DBB A valve with two sealing pairs. When in the closed position, the two sealing pairs can seal the pressure from the end at the same time. The medium in the cavity can be emptied or drained. 3.5 Double-isolation-and-bleed valve; DIB A valve with two sealing pairs. When in the closed position, the sealing pair can seal the pressure in two directions. The medium can be emptied or drained. Note. Divided into DIB-1 and DIB-2 according to function, DIB-1 means that two valve seats are two-way sealing; DIB-2 means that one valve seat is one-way sealing, and one valve seat is Two-way sealing. 3.6 Locking device A device that locks a valve in the open or closed position. 3.7 Drive train Except the device that drives the valve, all parts of the opening and closing parts of the valve. 3.8 Piggability When the valve passes through the sphere used to clean the inner wall of the pipeline, it is not blocked.

4 Structural type and size parameters

4.1 Structure type 4.1.1 Structure diagram Refer to Appendix A for the typical structure diagrams of ball valves, gate valves, plug valves, and check valves for pipelines. 4.1.2 Ball valve The opening and closing parts of the ball valve should be a spherical body, which rotates around the axis perpendicular to the flow of the medium; the sphere of the ball valve should be a solid sphere plus Worked. 4.1.3 Gate valve 4.1.3.1 The opening and closing parts of the gate valve shall be a single gate parallel to the sealing surface; or an open type gate with a combination of two or more parts parallel to the sealing surface.

5 Ordering requirements

5.1 When ordering valves, the buyer should determine the valve type and technical requirements of the order contract, and ensure that there should be sufficient information to be transmitted to all parties. Valve buyers can refer to Appendix C Table C.1 for ordering. 5.2 When the valve with a pressure-holding closed cavity is in the fully open or fully closed position, the pressure in the valve cavity will rise. A pressure relief device is installed on the valve body. 5.3 When the pipeline has pigging requirements, it should be confirmed whether the internal structure of the valve can pass the pig. There are opening and closing parts in the valve that obstruct the flow path and reduce the diameter The valve is not suitable for pigging operations. 5.4 The fire-resistant structure design of the valve shall be verified and evaluated according to GB/T 26479, GB/T 26482, ISO 10497 or agreed standards.

6 Technical requirements

6.1 Pressure-temperature ratings The pressure-temperature rating of the valve housing is in accordance with GB/T 12224. 6.2 Working pressure and temperature of the valve Limited by the allowable use pressure and temperature of non-metallic materials such as seat seal and packing seal in the valve, the working pressure and temperature of the valve Will be lower than the pressure-temperature rating of the valve housing. The valve should be restricted according to its structure, seat seal and packing seal and other non-metallic materials. The maximum working pressure and temperature range value should not be higher than the rated pressure-temperature rating of the ball valve housing. And should be clearly marked on the nameplate Show. The minimum and maximum working temperature of the valve and the corresponding working pressure and maximum working pressure difference. 6.3 The connection end of the valve and the pipeline 6.3.1 The dimensions of the flange connection end shall be in accordance with the provisions of GB/T 9124 (all parts), or as required by the order contract. 6.3.2 The size of the welded connection end shall be in accordance with the provisions of GB/T 12224, or as required by the order contract. 6.4 Valve operation 6.4.1 The manufacturer shall give the maximum allowable working pressure difference of gate valves, ball valves and plug valves and the operation at the maximum working pressure difference under normal temperature conditions. Torque or thrust value. 6.4.2 If the maximum working pressure difference is not given, the maximum allowable working pressure of the valve at 38℃ is regarded as the maximum allowable working pressure of the valve Differential pressure. 6.4.3 The manufacturer shall give the maximum allowable operating torque or thrust value on the valve stem, and the operating torque or thrust of the manual operating actuator. Force value and number of opening and closing turns of operating valve. 6.5 Flow coefficient For reduced diameter and necked valves, when the order contract requires, the manufacturer shall provide the buyer with the valve's flow coefficient value Kv. 6.6 Bolting of the shell 6.6.1 When bolting is used between the valve housing (the valve body and the left valve body), double-ended studs and nuts should be used, and the connection should be considered to be able to withstand the pipeline. Loads such as stretching and bending. The studs and valve body threads should be checked and calculated for tensile stress and shear force. Thread strength calculation The provisions of GB/T 12224. 6.6.2 The bolts of the valve stem packing cover, etc. should be designed to avoid the influence of the operating torque, and the bolts should be checked and calculated for tensile stress. 6.11.3 The valve can be connected to the handwheel or handle by extending the connecting stem and bracket; if the order contract requires it, the handwheel or handle There should be a fixed connection with the valve. 6.11.4 If required in the order contract, there should be a torque limiting device on the input shaft of the handwheel of the gearbox, such as a cut-off pin or an overload clutch In order to prevent damage to the gear transmission box. 6.12 Drive 6.12.1 The driving device can be electric, hydraulic or pneumatic, and combinations thereof. 6.12.2 The connection between the drive device and the valve, or the connection through the extension of the stem bracket, should have an appropriate method to ensure that the valve stem is not zero. It can prevent damage to the connecting parts of the valve operation and cause the leakage of the valve stem and other seals. 6.12.3 The output torque or thrust of the drive device should not exceed the maximum design load of the valve drive chain. 6.12.4 The size of the connecting surface between the valve and the drive device shall be in accordance with GB/T 12222 or GB/T 12223. 6.13 Valve opening indication 6.13.1 Regardless of the manual or other drive device used for the valve, an obvious indicator of the valve switch position should be provided. 6.13.2 For plug valves and ball valves that are directly operated with a wrench, the position of the wrench and/or opening indication should be. when the valve is opened, it should be level with the pipeline. When the valve is closed, it should be perpendicular to the pipeline. When designing, it should be so that there is no opening indicator and (or) wrench can not correctly indicate the opening and closing position When, the wrench cannot be installed. 6.13.3 For valves without restriction on opening and closing positions, a confirmation mark that the operator can align at the opening and closing positions of the valve shall be specified, and shall be provided on the operator. Or measures to correct the correct opening and closing positions when the actuator is removed. 6.14 Locking device 6.14.1 When the order contract requires it, the valve can provide a locking device. 6.14.2 In addition to check valves, the locking devices of other valves should be able to lock the valve in the fully open or fully closed position; if required, the check valve Just lock the valve in the open position. 6.15 Sealing of stem stuffing box and operating mechanism 6.15.1 The valve stem seal can be sealed with O-rings. The number and material of O-rings should be considered in the temperature range and working pressure of the valve. Requirements for power and use time. If packing is used, the packing sealing force can be adjusted without disassembling any parts of the valve. 6.15.2 The bolts of the packing gland shall not bear the shearing force generated by the torsion force of the ball valve operation. Compress the packing according to the maximum allowable working pressure and fill The tensile stress of the material gland bolting should not exceed one third of the tensile strength of the bolting material. 6.15.3 Sealing measures should be taken to prevent external impurities and humid gases from affecting the valve stem seal, packing gland, packing gland bolts, etc. influences. 6.15.4 The valve operating device and connection part, the valve stem extension rod and the sealing of the operating mechanism should be sealed to prevent external impurities. The influence of quality and humid gas on parts. 6.16 Strength design of drive chain parts 6.16.1 The strength design of all drive chain parts should be at least 2% of the operating torque or thrust required to open the valve under the maximum allowable working pressure difference. Times. The strength of the connecting part of the valve stem and the opening and closing parts (such as sphere, gate, cock, etc.) and all pressure parts of the valve stem should exceed the stem nut Or the design strength of the stem outside the packing gland nut, no permanent deformation or damage occurs in any part of it. 6.16.2 Allowable stress. In the drive chain, the tensile stress of the valve stem or extended valve stem should not exceed 67% of the material's lowest yield strength; tangential The force, torsion and supporting stress should not exceed the requirements of the relevant standards. 6.16.3 After the drive chain is connected, the deviation of its torque and stroke shall not affect the opening and closing of the valve to reach the fully closed or fully open position. 9.4.1.3 Cut-off and relief valve (BB type). close the two ends of the valve, the valve is partially opened, open the valve body cavity to discharge the valve or remove the plug, The test medium water should be discharged, fill the valve body with the test medium, and then close the valve; apply medium pressure to the inlet end of the valve block valve seat Force and maintain, and detect the leakage rate at the pressure relief port of the middle cavity. 9.4.1.4 Double cut-off and relief valve (DBB). close the two ends of the valve, the valve is partially opened, open the valve body cavity to release the valve or remove the plug, should When the test medium water is discharged, the valve body is filled with the test medium, and then the valve is closed; at the same time, the medium pressure is applied to the two inlet ends of the valve and Keep, check the leakage rate at the pressure relief port of the middle cavity. 9.4.1.5 Double isolation and relief valve (DIB-1 type). Each valve seat shall be tested in two directions of medium flow. Close both ends of the valve, partially open the valve, open the valve body cavity to release the valve or remove the plug, and the test medium water should be discharged to the valve body Fill with the test medium, and then close the valve; the test pressure should be applied to the two inlet ends of the valve and maintained, and the pressure should be checked at the pressure relief port of the middle cavity. Measure the leakage of the valve seat. After that, the pressure of the test medium at both ends of the valve is discharged, the middle cavity of the valve body is filled with the test medium, and the medium pressure is applied through the middle cavity relief interface And keep it, while detecting the leakage rate of the valve seat at both ends of the valve. 9.4.1.6 Double isolation and relief valve (DIB-2 type). the two-way valve seat shall be tested in two medium flow directions, and the one-way seat shall be in the medium flow direction. To experiment. a) Close both ends of the valve, partially open the valve, open the valve body cavity to release the valve or remove the plug, and the test medium water should be discharged. Fill the valve body with the test medium, and then close the valve; apply test pressure to each inlet end, respectively, at the pressure relief interface of the middle cavity Check the leak rate. b) After a) test, carry out the test of the other flow direction of the two-way seat; release the pressure of the test medium at both ends of the valve, and the valve body The cavity is filled with test medium, and the medium pressure is applied and maintained through the middle cavity relief interface to detect the leakage rate of the inlet of the two-way seat. 9.4.1.7 Check valve. close the outlet end of the medium flow direction of the check valve, fill the end to the sealing surface with the test medium, apply medium pressure and maintain. Check the leakage rate at the inlet end of the valve medium flow direction. 9.4.2 Test results 9.4.2.1 During the duration of the test pressure, there should be no visible leakage of the elastic seal valve and the oil seal plug valve. The maximum a......

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Question 2: Can I share the purchased PDF of GB/T 19672-2021_English with my colleagues?

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Question 5: Should I purchase the latest version GB/T 19672-2021?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 19672-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.