GB/T 12235-2007 English PDF (GBT12235-2007)

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GB/T 12235-2007: Steel globe valves and lift check valve for petroleum, petrochemical and allied industries [including MODIFICATION 1]
GB/T 12235-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.060.50
J 16
Replacing GB/T 12235-1989
Steel Globe Valves and Lift Check Valve for Petroleum,
Petrochemical and Allied Industries
[Including No.1 Amendment 2011XG1]
ISSUED ON: APRIL 18, 2007
IMPLEMENTED ON: NOVEMBER 1, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Structural Types ... 7 
4 Technical Requirements ... 11 
5 Materials ... 24 
6 Test Methods and Inspection Rules ... 27 
7 Marking ... 30 
8 Packaging, Storage and Transportation ... 32 
Appendix A (Informative) Order Contract Data Sheet of Steel Globe Valves and Lift
Check Valve for Petroleum, Petrochemical and Allied Industries ... 33 
No.1 Amendment ... 35 
Steel Globe Valves and Lift Check Valve for Petroleum,
Petrochemical and Allied Industries
1 Scope
This Standard specifies the structural types, technical requirements, materials, test methods
and inspection rules, marking, packaging, storage and transportation of steel globe valves and
lift check valves with bolted bonnets.
This standard is applicable to the steel globe valves and lift check valves with bolted bonnets
and flanged or welded ends, with a nominal pressure of PN 16~PN 420, nominal dimension
of DN 15~DN 400 and service temperature of -29℃~538℃, for petroleum, petrochemical
and allied industries.
This standard is applicable to the straight pattern, angle or Y pattern globe valves, steel lift
check valves and steel globe stop valves.
Steel throttle valves may refer to this standard.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute
provisions of this standard. For dated reference, subsequent amendments to (excluding
correction to), or revisions of, any of these publications do not apply. However, the parties to
agreements based on this standard are encouraged to investigate the possibility of applying
the most recent editions of the standards. For undated references, the latest edition of the
normative document referred to applies.
GB 150 Steel Pressure Vessels
GB/T 152.4 Fasteners-Counterbores for Hexagon Bolts and Nuts
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 228 Metallic Materials-Tensile Testing at Ambient Temperature (GB/T 228-2002,
eqv ISO 6892: 1998)
GB/T 798 Bye bolts
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 Threads-Part 2: General Plan (GB/T 5796.2-2005, ISO
2902: 1977, MOD)
GB/T 5796.3 Trapezoidal 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 (All Parts) Integral 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 12222 Multi-turn valve actuator attachments (GB/T 12222-2005, ISO 5210: 1991,
MOD)
GB/T 12224 General Requirements for Industrial Steel Valves (GB/T 12224-2005, ASTM
B16.34a: 1998, NEQ)
GB/T 12228 General Purpose Industrial Valves-Specification of Carbon Steel Forgings
GB/T 12229 General Purpose Industrial Valves-Specification of Carbon Steel Castings
GB/T 12230 General Purpose Industrial Valves-Specification of Austenitic Steel Castings
JB/T 106 Valves Marking and Paint
JB/T 6440 Methods of Radiographic Examination for Steel Castings Valves
JB/T 8859 Globe valve-potential pressure life test regulation
JB/T 9092 Valve Inspection and Testing
4.10.1 The packing uncompressed may be either square, rectangular or V-shaped in
cross-section.
4.10.2 The depth of the packing box shall accommodate a minimum of five uncompressed
rings of packing, unless otherwise specified. The packing box surface area in contact with the
packing shall have a surface finish, Ra of 3.2 μm or smoother.
4.10.3 The bore (inside diameter) of the packing box shall be equal to the stem diameter
plus twice the packing width plus 0.8 mm.
4.10.4 A packing gland shall consist of a gland flange and a gland follower (spherical joint
face). The gland flange shall have through hole (non-opening) flange to receive two erection
bolts. The gland follower shall have a shoulder at its outside diameter on the top of spherical
surface so as to prevent complete entry of the gland into the packing box. The bolting of the
packing gland may be one of the following types:
a) Eyebolts secured on the bonnet by pins having separation controls through the holes;
b) Studs passing through the holes on the bonnet neck flanges and secured on the flanges
by two nuts (on both sides of the flanges).
4.10.5 A lantern ring shall be provided only if it is specified in the order contract. Holes
shall be located 180°apart on each end for its installation or removal. These holes may be
either through holes for use with a hook or M3 threaded holes as specified in GB/T 196 for
use with holders. The packing box shall be tapped opposite the centre of the installed lantern
ring and shall be fitted with a plug. The nominal dimension of the taper-thread shall not be
less than DN 8. Bosses as specified in GB/T 12224 shall be provided at the taper thread
outside the packing box. When a lantern ring is installed, the packing box depth shall be at
least equivalent to that of a minimum of six uncompressed rings of packing plus the thickness
of the lantern ring.
4.11 Handwheel and operation
4.11.1 Unless otherwise specified in the order contract, the globe valve and globe stop valve
shall be supplied with a direct operated handwheel that opens the valve when turned in a
counter-clockwise direction.
4.11.2 The handwheel operating globe valve shall be a spoke-rim type with a maximum of
six spokes. Unless otherwise specified in the order contract, the handwheel shall be a
one-piece carbon steel cast or forging, malleable cast iron, or spheroidal graphite iron
casting’s structure or a multi-piece carbon steel fabrication that includes other carbon steel
product forms. Fabricated handwheels shall have strength and toughness characteristics
comparable to that of one-piece handwheels.
4.11.3 Unless the handwheel is too small, the handwheel shall be marked with the word
“OPEN” and an arrow pointing in the rotation direction.
4.14 Non-destructive testing
4.14.1 Welding position at welded end
4.14.1.1 As for all the valves at the welded ends, liquid penetrant testing must be carried out
at the welding ends to be free from injurious defects.
4.14.1.2 As for the welding ends with the following junction conditions, radiographic
testing shall be carried out in accordance with JB/T 6440 and the results shall conform to th...