Bellows sealing steel globe valve
1 Scope
This standard specifies the type of construction, parameters, technical requirements, inspection methods, inspection rules, marking and delivery of bellows sealing steel globe valves.
This standard is applicable to bellows sealing steel globe valves with nominal pressure of PN16~PN260 and nominal size of DN15~DN400.
It may also serve as a reference for bellows sealing steel throttle valves and bellows sealing steel stop check valves.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 228 Metallic materials - Tensile testing at ambient temperature
GB/T 1047 Pipework components - Definition and selection of DN (nominal size)
GB/T 1048 Pipework components - Definition and selection of PN
GB/T 3089 Seamless ultra-thin wall stainless steel tubes
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 4238 Heat-resisting plate, sheet and strip
GB/T 5796 (all parts) Trapezoidal screw threads
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 12221 Metal calves - Face to face, end to end, center to face and center to end dimensions
GB/T 12222 Multi-turn valve actuator attachments
GB/T 12224-2005 General requirements for industrial steel valves
GB/T 12235 Steel globe valves and lift check valve for petroleum, petrochemical and allied industries
GB/T 14992 Classification and designation for superalloys and high temperature intermetallic materials
JB/T 6440-2008 Methods of radiographic examination for steel castings valves
JB/T 7746-2008
Compact steel valves
JB/T 7928 General purpose industrial valves - Delivery specification
JB/T 8859 Globe valve - Potential pressure life test regulation
JB/T 9092 Valve inspection and testing
JB/T 10507-2015 The metal bellows for valves
YB/T 5354 Cold-rolled plates of corrosion-resisting alloys
3 Types of construction and parameters
3.1 Types of construction
The typical types of construction and main part names of bellows sealing steel globe valves are as shown in Figure 1 ~ Figure 4.
Foreword i
1 Scope
2 Normative references
3 Types of construction and parameters
3.1 Types of construction
3.2 Parameters
4 Technical requirements
4.1 Pressure-temperature rating
4.2 Structural length
4.3 Connecting end
4.4 Body and bonnet
4.5 Disc
4.6 Seat
4.7 Stem and stem nut
4.8 Bellows assemblies
4.9 Stuffing box and packing
4.10 Gland
4.11 Connecting studs or bolts between body and bonnet
4.12 Hand wheel and operation
4.13 Potential pressure life
4.14 Non-destructive testing
5 Materials
5.1 Body and bonnet
5.2 Stem
5.3 Sealing face of seat and disc
5.4 Connecting gaskets for body and bonnet
5.5 Seat and disc
5.6 Connecting studs/bolts for body and bonnet
6 Test methods
6.1 Test of bellows assemblies
6.2 Valve pressure test
6.3 Helium mass spectrometer for leak detection
6.4 Measurement of body wall thickness
6.5 Measurement of stem diameter
6.6 Measurement of stem hardness
6.7 Measurement of sealing face hardness
6.8 Material composition analysis
6.9 Mechanical properties of materials
6.10 Potential pressure life test
6.11 Marking examination of body and bonnet
6.12 Examination of nameplate content
6.13 Non-destructive testing
7 Inspection rules
7.1 Inspection items
7.2 End-of-manufacturing inspection
7.3 Type inspection
7.4 Sampling method
8 Marking
8.1 Marking contents
8.2 Markings on the body and the bonnet
8.3 Markings on the nameplate
9 Supply
Annex A (Informative) Common ASTM materials for bellows
Figure 1 Bellows sealing steel globe valve of flanged ends
Figure 2 Bellows sealing steel globe valve of welded ends
Figure 3 Bellows sealing steel globe valve of flanged ends
Figure 4 High-pressure bellows sealing steel globe valve
Table 1 Common materials of bellows
Table 2 Minimum number of cycle life tests for bellows
Table 3 Number of potential pressure life tests for bellows sealing steel globe valves
Table 4 Materials of stem
Table 5 Materials of sealing face
Table 6 Connecting gaskets for body and bonnet
Table 7 Inspection items, technical requirements and inspection methods
Table 8 Minimum base number and sampling number
