This standard specifies pressure-temperature rating, materials, design requirements, inspection and test, marking as well as non-destructive inspection and repair of industrial steel valves.
This standard is applicable to materials given in Table 1 (valve body may be cast, forged, welded in combination; flanged, threaded and welding end connection may be adopted as the end connection) and wafer type and single-flange valves.
Parameter ranges applicable to valves in this standard are as follows:
a) For the valves with nominal pressure PN16~PN760, the nominal pressure PN760 is only applicable to welding end valves;
b) Valves on flange connection ends and valves on butt welding ends with nominal size not greater than DN1250;
c) Valves on socket weld ends and valves on threaded connection ends with nominal size not greater than DN65;
d) Valves on threaded connection ends with rated temperature and nominal pressure not greater than 540℃ and PN420 respectively;
e) Valves on flange connection ends with nominal pressure PN16~PN25 and rated temperature not greater than 540℃.
Foreword IV
1 Scope
2 Normative References
3 Pressure-temperature Rating
3.1 General
3.2 Rated Temperature
3.3 Temperature Influence
3.4 Service Requirements for Valves on Flange Connection Ends
3.5 Deviation
3.6 Multiple Material Grades
3.7 Partial Operation Conditions
4 Marking
5 Materials
5.1 General
5.2 Material Selection
5.3 Anti-static Requirements
6 Design Requirements
6.1 Valve Body Design
6.2 End Size
6.3 Auxiliary Connecting Pieces
6.4 Valve Assembly
6.5 Stem
6.6 Installation limit
6.7 Wafer valve
7 Inspection and Test
7.1 Inspection
7.2 Pressure test
8 Defect Removal and Repair
8.1 Defect removal
8.2 Repair by repair welding
Appendix A (Informative) Relationship between the Nominal Size of Valve and the Basic inside Diameter of Valve Body End
Appendix B (Informative) Determination Method for the Pressure-temperature Rating
B.1 General
B.2 Determination method of standard pressure level rating
B.3 Determination method of special pressure rating
Appendix C (Normative) Non-destructive Inspection Requirements for Valves
C.1 Scope
C.2 General
C.3 Specified inspection
Appendix D (Normative) Pressure-temperature Rating of Special Pressure Valve
Figure 1 Neck of Valve Body
Figure 2 Butterfly Valve Body
Figure 3 Groove on Welding End
Figure 4 Length of Auxiliary Connecting Thread
Figure 5 Boss for Auxiliary Connection
Figure 6 Socket Welding for Auxiliary Connection
Figure 7 Butt Welding for Auxiliary Connection
Figure 8 Expression Method for Auxiliary Connection Position
Figure C.1 Gate Valve Body(Self-sealing Valve Cover)
Figure C.2 Y-shaped Stop Valve Body (Self-sealing Valve Cover)
Figure C.3 Angle Valve Body (Self-sealing Valve Cover)
Figure C.4 Downward Bend Valve Body (Self-sealing Valve Cover)
Figure C.5 Gate Valve Body (Valve Cover of Flange Connection)
Figure C.6 Stop Valve Body (Valve Cover of Flange Connection)
Figure C.7 Butterfly Valve Body
Figure C.8 Plug Valve Body
Figure C.9 Piping Valve Body (Self-sealing Valve Cover)
Figure C.10 Butterfly Valve Cover
Figure C.11 Cover Plate
Table 1 Materials for Pressure-bearing Parts of Industrial Steel Valves
Table 2-1 Pressure-temperature Rating of Standard Pressure Valve
Table 2-2 Pressure-temperature Rating of Standard Pressure Valve
Table 2-3 Pressure-temperature Rating of Standard Pressure Valve
Table 2-4 Pressure-temperature Rating of Standard Pressure Valve
Table 2-5 Pressure-temperature Rating of Standard Pressure Valve
Table 2-6 Pressure-temperature Rating of Standard Pressure Valve
Table 2-7 Pressure-temperature Rating of Standard Pressure Valve
Table 2-8 Pressure-temperature Rating of Standard Pressure Valve
Table 2-9 Pressure-temperature Rating of Standard Pressure Valve
Table 2-10 Pressure-temperature Rating of Standard Pressure Valve
Table 2-11 Pressure-temperature Rating of Standard Pressure Valve
Table 2-12 Pressure-temperature Rating of Standard Pressure Valve
Table 3 Minimum Wall Thickness tm of Shell In mm
Table 4 Size of Welding End In mm
Table 5 Effective Length of Auxiliary Connecting Shell Thread In mm
Table 6 Relevant Socket Welding Size of Auxiliary Connecting Shell In mm
Table 7 Diameter of the Circumcircle of Auxiliary Connecting Boss In mm
Table 8 Specification of Auxiliary Connecting Pieces In mm
Table 9 Shell Test Duration of Valve
Table 10 Valve with 0.6MPa Gas for Sealing Test
Table 11 Sealing Test Duration of Valve
Table A.1 Relationship between the Nominal Size of Valve and the Basic Inside Diameter of Valve Body End In mm
Table D.1 Pressure-temperature Rating of Special Pressure Valve
Table D.2 Pressure-temperature Rating of Special Pressure Valve
Table D.3 Pressure-temperature Rating of Special Pressure Valve
Table D.4 Pressure-temperature Rating of Special Pressure Valve
Table D.5 Pressure-temperature Rating of Special Pressure Valve
Table D.6 Pressure-temperature Rating of Special Pressure Valve
Table D.7 Pressure-temperature Rating of Special Pressure Valve
Table D.8 Pressure-temperature Rating of Special Pressure Valve
Table D.9 Pressure-temperature Rating of Special Pressure Valve
Table D.10 Pressure-temperature Rating of Special Pressure Valve
Table D.11 Pressure-temperature Rating of Special Pressure Valve
Table D.12 Pressure-temperature Rating of Special Pressure Valve
