This standard specifies the classification, technical requirements, test methods, inspection rules, marking and packaging of flange cast steel sea water stop valve (hereinafter referred to as stop valve) with flange connection dimension in accordance with GB 569 and GB 2501.
This standard is applicable to the marine pipeline system with fresh water and sea water as the medium.
2 Normative References
GB 569 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB 600 General Specifications for Marine Piping Valves and Fittings
GB 2501 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB 3032 Marks for Marine Piping Valves and Fittings
GB 11698 Metal Valves for Use in Marine Flanged Pipe Systems - Face-to-face and Centre-to-face Dimensions
ZB/T U52 001 Wall Thickness of Casting Body for Marine Valve
3 Product Classification
3.1 Type
The types of stop valve are specified as follows:
Type A - through-type stop valve with flange connection dimension and sealing face in accordance with GB 569.
Type AS - through-type stop valve with flange connection dimension and sealing face in accordance with GB 2501.
Type B - perpendicular-type stop valve with flange connection dimension and sealing face in accordance with GB 569.
Type BS - perpendicular-type stop valve with flange connection dimension and sealing face in accordance with GB 2501.
3.2 Basic parameters
See Table 1 for the basic parameters of stop valve.
Table 1
Type Nominal pressure PN
MPa Nominal diameter DN
mm
A, AS, B and BS 1.6 40~150
1.0 65~150
0.6 200~250
3.3 Structural dimension of stop valve
3.3.1 See Figures 1 and 2 and Table 2 for the structures and basic dimensions of Type A and Type B stop valves.
Figure 1 Type A and Type AS Figure 2 Type B and Type BS
Table 2
mm
Nominal pressure
MPa Nominal diameter
DN Structure dimension Flange connection dimension Hand wheel Lift
m Weight
kg
Type A Type B D D1 D2 d0 b n Th. D0 S Type A Type B
The through-type flange cast steel sea water stop valve with nominal pressure of 1.6MPa, nominal diameter of 40mm, flange connection dimension and sealing face in accordance with GB 569 is labeled as:
Stop valve A16040 CB/T 3196-1995
The perpendicular-type flange cast steel sea water stop valve with nominal pressure of 1.0MPa, nominal diameter of 100mm, flange connection dimension and sealing face in accordance with GB 2501 is labeled as:
Stop valve BS10100 CB/T 3196-1995
4 Technical Requirements
4.1 The technical requirements of stop valve shall meet the requirements of GB 600.
4.2 The materials for main parts of stop valve are in accordance with those specified in Table 4.
Table 4
Parts name Material
Name Designation Standard No.
Valve body and valve deck Cast steel ZG230-450 CB 772-86
Valve disk Cast tin bronze ZQSn10-2 CB 883-83
Vale rod Aluminum bronze QAl9-2 GB 4429-84
Valve seat Cast aluminum bronze ZQAl9-2 CB 883-83
4.3 The flange connection dimension and sealing face of stop valve comply with those specified in GB 569 and GB 2501.
4.4 The structural lengths of Type AS and Type BS comply with those specified in GB 11698.
4.5 The wall thickness of stop valve complies with those specified in ZB/T U52 001.
5 Test Methods and Inspection Rules
5.1 The test methods of stop valve shall meet the requirements of GB 600.
5.2 The end-of-manufacturing inspection items and requirements of stop valve shall comply with those specified in Table 5.
Table 5
No. Item Requirements
1 Mechanical property determination and chemical composition analysis of casting Comply with CB 772
2 Appearance inspection Comply with GB 600
3 Strength test
4 Sealing test
5.3 Each group of stop valves may leave the factory only when all items in Table 5 are acceptable.
6 Marking and Packaging
6.1 The marking of stop valve complies with the requirements of GB 3032.
6.2 The packaging of stop valve complies with the requirements of GB 600.
1 Subject Content and Application Scope 2 Normative References 3 Product Classification 4 Technical Requirements 5 Test Methods and Inspection Rules 6 Marking and Packaging Additional Information
