Steel valve material, design, inspection requirements Steel valve general requirements

Steel valve material, design, inspection requirements Steel valve general requirements

This standard specifies the pressure and temperature ratings, materials, design requirements, inspection and testing, marking and non-destructive inspection and repair of steel valves. Within nominal pressure class values, the intermediate rating between listed temperature ratings or pressure ratings can be determined by linear interpolation. But for flanged valves, the linear interpolation method is not allowed to determine the nominal pressure. The temperature corresponding to the rated pressure is the rated temperature of the pressure housing, which is the same as the temperature of the medium in it.
1 Range
This standard specifies the pressure and temperature ratings, materials, design requirements, inspection and testing, marking and non-destructive inspection and repair of steel valves.
This standard applies to the materials listed in Table 1. The body may be cast, forged and welded, the end connections may be flanged, threaded and welded, and for clip-mounted and single-flanged valves.
This standard applies to the valve parameters range:
a) Nominal pressure PN16 ~PN760 valves, nominal pressure PN760* is suitable for welding end valves;
b) Nominal size not greater than DN125. Flange connecting end valve and butt welding connecting end valve;
c) Welded end valves and threaded end valves with nominal size not greater than DN65:
d) threaded end valves with rated temperature no more than 540¡æ and nominal pressure no more than PN420;
e) Flanged valves with nominal pressure PN16~PN25, rated temperature not greater than 540¡æ
2 Normative reference documents
The terms in the following documents become terms of this Standard by reference to this Standard. For dated citations, all subsequent amendments (excluding errata) or amendments are not applicable to this Standard, however, parties to agreements under this Standard are encouraged to explore the use of versions of these documents. For undated references, their versions are applicable to this standard.
GB 150-1998 steel pressure vessel
GB/T 193-2003 Common Thread Diameter and screw series (ISO 261:1998,MOD)
GB/T 197-2003 Common thread tolerance (ISO 965-1:1998,MOD)
GB/T 228-2002 Metallic materials — tensile test method at room temperature (eqvISO 6892:1998)
Mass carbon structural steel hot rolled thick sheet and wide strip (neq TOCT 1577)
GB/T 1047-2005 Piping elements DN(nominal dimensions) — Definition and selection (ISO 6708:1996, >
GB/T 1048-2005 Pipe element PN(nominal pressure) definition and selection (ISO/CD7268:1996.) >
Low alloy steel sheet for cryogenic pressure vessels
Stainless steel hot rolled steel sheet (neq JIS 64304:1984)
GB/T 6654-1996 Steel plate for pressure vessels
GB/T 7306-2000 Pipe threads, 55¡ã sealed (eqv ISO 7-1:1994)
GB/T 9113~9123-2000 steel pipe flange
Specification for GB/T 9124-2000 steel pipe flanges
GB/T12220 Universal Valve mark (GB/T12220-1989, >
GB/T12221 metal valve structure length (GB/T12221–2005, ISO 5752; 1982 , MOD)
GB/T 12228 general valve carbon steel forgings technical conditions
GB/T 12229 general valve carbon steel castings technical specifications
GB/T 12230 general purpose valve austenitic steel castings technical specifications
GB/T 12716-2002 60¡ã sealed pipe thread (eqv ASME B1.20.1:1992)
GB/T 13927 General valve pressure test (neq ISO 5208:1982)
Stainless steel seamless steel tubes for fluid transport GB/T 14976-2002
GB/T 1751-1992 Valve structural elements socket weld connections and piping ends dimensions
Steel valves General Requirements (1) This standard applies to the various materials listed in Table 1. The body may be cast, forged or welded, and the end connections may be flanged, threaded or welded, as well as valves for clip-on and single-flange mounting. The terms in the following documents become terms of this Standard by reference to this Standard. For dated citations, all subsequent amendments (excluding errata) or amendments are not applicable to this Standard, however, parties to agreements under this Standard are encouraged to explore the use of versions of these documents. This standard applies to all undated references.
1 Range
This standard specifies the pressure and temperature ratings, materials, design requirements, inspection and testing, marking and non-destructive inspection and repair of steel valves.
This standard applies to the materials listed in Table 1. The body may be cast, forged and welded, the end connections may be flanged, threaded and welded, and for clip-mounted and single-flanged valves.
This standard applies to the valve parameters range:
a) Nominal pressure PN16–PN760 valve, nominal pressure PN760 is suitable for welding end valves;
b) Flanged end valves and butt welded end valves of nominal size not greater than DN1250;
c) Welded end valves and threaded end valves with nominal size not greater than DN65:
d) Valves with threaded connection ends whose rated temperature is not more than 540¡æ and nominal pressure is not more than PN420;
e) Flanged valves with nominal pressure PN16~PN25, rated temperature not greater than 540¡æ
2 Normative reference documents
The terms in the following documents become terms of this Standard by reference to this Standard. For dated citations, all subsequent amendments (excluding errata) or amendments are not applicable to this Standard, however, parties to agreements under this Standard are encouraged to explore the use of versions of these documents. This standard applies to all undated references.
GB 150-1998 steel pressure vessel
GB/T 193-2003 Common Thread diameter and pitch series (ISO 261:1998,MOD)
GB/T 197-2003 Common thread tolerance (ISO 965-1; 1998,MOD)
GB/T 228-2002 Metallic materials — Tensile test at room temperature (eqv IS0 6892:1998)
Mass carbon structural steel hot rolled thick sheet and wide strip (neq TOCT 1577)
GB/T 1047-2005 Piping elements DN(nominal dimensions) — Definition and selection (ISO 6708:1995,>
GB/T 1048-2005 Pipe element PN(nominal pressure) definition and selection (ISO/CD 7268:1996.) >
Low alloy steel sheet for cryogenic pressure vessels
Stainless steel hot rolled steel sheet (neq JIS 64304:1984)
Steel plates for pressure vessels
GB/T 7306-2000 Sealing pipe thread (eqv 1SO 7-1:1994)
GB/T 9113– 9123-2000 steel pipe flange
Specification for GB/T 9124-2000 steel pipe flanges
GB/T 12220 Universal Valve mark (GB/T 12220-1989,>
GB/T12221 Metal valve structure length (GB/T12221–2005, ISO 5752:1982 MOD)
GB/T 12228 general valve carbon steel forgings technical conditions
GB/T 12229 general valve carbon steel castings technical specifications
GB/T 12230 general purpose valve austenitic steel castings technical specifications
GB/T 12716-2002 60¡ã sealed pipe thread (eqv ASME B1.20.1:1992)
GB/T 13927 General valve pressure test (ney ISO5X208:1982)
Stainless steel seamless steel tubes for fluid transportation
Structural elements of valves — socket welding connections and piping ends — dimensions
JB 4726–2000 forgings of carbon and low alloy steel for pressure vessels
JB 4727-200. Low temperature pressure vessels with carbon and low alloy steel forgings
JB 4728-200. Stainless steel forgings for pressure vessels
Specification for JB/T 5263 Power Station Valve Steel Castings (ney ANSI/ASTM A217M)
JB/T 6439 Valve compression cast steel magnetic particle inspection
Radiographic examination of compression cast steel parts of JB/T 6440 Valve
JB/T 6902 valve cast steel – test method for liquid penetration
JB/T ’6903 valve forged steel parts ultrasonic inspection method
JB/T 7248 valve low temperature cast steel specifications
JB/T 7927 valve steel castings appearance quality requirements
3 Pressure to temperature rating
3.1 Overview
3.1.1 pressure-temperature rating
3.1.2 The pressure-temperature rating shall be as specified in Table 2, and shall be as specified in GB/T 9124-2000 except as specified in Table 2.
Standard pressure level valve
Valves that meet the requirements of this standard, other than those that meet the NDT requirements of Appendix C valves, are designated as standard pressure class valves with pressure-temperature ratings as specified in 3.1.1.
3.1.3 Special pressure level valves
Valves that meet the requirements of 3.1.2 and that meet the NDT requirements of Appendix C valves have pressure-temperature ratings as specified in tables D.1L through D.12 in Appendix D. Special pressure rating does not apply to flanged end valves.
3.1.4 Intermediate rated valve
Within nominal pressure class values, the intermediate rating between listed temperature ratings or pressure ratings can be determined by linear interpolation. But for flanged valves, the linear interpolation method is not allowed to determine the nominal pressure.
3.1.5 Assembly of welds
Valves welded in whole or in part with castings, forgings, rods, plates or pipes shall meet the following requirements:
a) Welding and heat treatment of welds shall be conducted in accordance with the provisions of GB 150-1998;
b) Weld inspection and acceptance shall be in accordance with the provisions of GB 150-1998;
c) The above requirements do not apply to sealing or attachment welding, such as the welding of reverse seals, seat rings, lifting lugs and auxiliary fittings.