1. Scope
This standard specifies structural type, requirements, test methods, inspection rules, marking and supply requirements of reduced-port forging steel valves, including gate valve, globe valve, throttle valve and lift check valve.
This standard is applicable to internal threaded and socket welding valves with the nominal pressure of PN 16~PN 250 and nominal dimension of DN 8~DN 65 and flanged and butt welding valves with the nominal pressure of PN 16~PN 250 and nominal dimension of DN 8~DN 100. The applicable media include petroleum and relevant petroleum products, natural gas and steam.
This standard is also applicable to valves whose bonnets are sealed with bellow, nominal pressure and nominal dimension are PN 16~PN 250 and DN 8~DN 50 respectively.
2. Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments to (excluding corrigendum), or revisions of, any of these publications do not apply. However, the parties who enter into agreement according to this standard are encouraged to study whether the latest editions of these documents apply. For undated references, their latest editions apply.
GB 150 Steel Pressure Vessels
GB/T 196 General Purpose Metric Screw Threads - Basic Dimensions" (GB/T 196-2003, ISO 724: 1993, MOD)
GB/T 197 General Purpose Metric Screw Threads - Tolerances (GB/T 197-2003, ISO 965-1: 1998, MOD)
GB/T 898 Double End Studs bm=1.25d
GB/T 1220 Stainless Steel Bars (GB/T 1220-1992, neq JIS G4303: 1988)
GB/T 1221 Heat-resisting Steel Bars (GB/T 1221-1992, neq JIS G4311: 1987)
GB/T 3077 Alloy Structure Steels (GB/T 3077-1999, neq DIN EN 10083-1: 1991)
GB/T 5796.1 Trapezoidal Screw Threads - Part 1: Profiles (GB/T 5796.1-2005, ISO 2901: 1993, MOD)
GB/T 5796.2 Trapezoidal Screw Thread - Part 2: General Plan (GB/T 5796.2-2005, ISO 2902: 1977, MOD)
GB/T 5796.3Trapezoidal Screw Threads - Part 3: Basic Dimensions (GB/T 5796.3-2005, ISO 2904: 1977, MOD)
GB/T 5796.4 Trapezoidal Screw Threads - Part 4: Tolerances (GB/T 5796.4-2005, ISO 2903: 1993, MOD)
GB/T 7306.2 Pipe Threads with 55 Degree Thread Angle Where Pressure-tight Joints Are Made on the Threads - Part 2: Taper Internal and External Threads (GB/T 7306.2-2000, eqv ISO 7-1: 1994)
GB/T 9113~9117 Steel Pipe Flanges
GB/T 9124 Specification for Steel Pipe Flanges
GB/T 12220 General Purpose Industrial Valves - Marking (GB/T 12220-1989, idt ISO 5209: 1977)
GB/T 12221 Metal Valves - Face to Face, End to End, Center to Face and Center to End Dimensions (GB/T 12221-2005, ISO 5752: 1982, MOD)
GB/T 12224 General Requirements for Industrial Steel Valves (GB/T 12224-2005, ASME B16.34a:1998, NEQ)
GB/T 12228 General Purpose Industrial Valves - Specification of Carbon Steel Forgings
JB/T 4730.1~JB/T 4730.6 Nondestructive Testing of Pressure Equipments
JB/T 5300 General Purpose Industrial Valves - Material
JB/T 7928 General Purpose Industrial Valve - Delivery Specification
JB/T 8858 Gate Valve - Potential Pressure Life Test Regulation
JB/T 8859 Globe Valve - Potential Pressure Life Test Regulation
JB/T 9092 Valve Inspection and Testing
Contents
Foreword I
1. Scope
2. Normative References
3. Structural Type
4. Order Requirements
5. Technical Requirements
5.1 Pressure-temperature Rating
5.2 Body Connection End
5.3 Body and Bonnet
5.4 Connection of Body and Bonnet
5.5 Disc
5.6 Connection of Stem and Wedge
5.7 Connection of Stem and Disc
5.8 Engagement of Stem and Stem Nut
5.9 Packing and Stuffing Box
5.10 Bolted Packing Gland Assembly
5.11 Threaded Packing Gland Assembly
5.12 Handwheel
5.13 Material
5.14 Static Pressure Service Life
6. Inspection Method
6.1 Pressure Test
6.2 Pressure Test of Bellow Sealed Valve
6.3 Bellows Inspection and Test
6.4 Static Pressure Service Life Test
6.5 Supplemental Inspection
7. Inspection Rules
7.1 Delivery Inspection
7.2 Type Inspection
7.3 Sampling Methods
8. Marking
9. Supply and Packaging
Appendix A (Normative) Pressure-temperature Rating of Valve with Nominal Pressure of PN 140
Appendix B (Normative) Pressure-temperature Rating of Valve with Nominal Pressure of PN 250
Appendix C (Normative) Dimension of Butt Welded Ends
Figure 1 Outside Screw Rising Steam Type Gate Valve
Figure 2 Inside Screw Non-rising Steam Type Gate Valve
Figure 3 Globe Valve and Throttle Valve
Figure 4 Lift Check Valve
Figure 5 Bellows Gate Valve
Figure 7 Wear Stroke of Wedge
Figure 6 Socket Welding Connection End Form
Figure C.1 Applicable to Welded Pipe with Wall Thickness (t) from 4.8 to 22.2
Table 1 Structural Length of Internal Threaded and Socket Welding Valves
Table 2 Socket Welding Valve end Dimension
Table 3 Minimum Wall Thickness of Body and Bonnet
Table 4 Material of Body, Internals, Connecting Bolt/Nut
Table 5 Minimum Diameter of Seat Hole
Table 6 Minimum Diameter of Stem
Table 7 Minimum Cycle Life
Table 8 Minimum Depth of Stuffing Box
Table 9 Overlaying Materials for Sealing Surface
Table 10 Delivery Inspection and Type Inspection Requirements for Valve
Table A.1 Pressure-temperature Rating of Valve with Nominal Pressure of PN 140
Table B.1 Pressure-temperature Rating of Valve with Nominal Pressure of PN 250
Table C.1 Dimension
