This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of cast steel flanged seawater stop check valves (hereinafter referred to as stop check valves) with flange connection dimension in accordance with those specified in GB 569 and GB 2501.
This standard is applicable to the marine pipeline system with fresh water and seawater as the medium.
2 Normative References
GB 569-65 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB 600-91 General Specifications for Marine Piping Valves and Fittings
GB 2501-89 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB 3032-89 Marks for Marine Piping Valves and Fittings
GB 11698-89 Metal Valves for Use in Flanged Pipe Systems - Face-to-face and Centre-to-face Dimensions
ZB/T U52 001-89 Wall Thickness of Casting Body for Marine Valve
3 Product Classification
3.1 Type
The types of stop check valves are specified as follows:
Type A - through-type stop check valve with flange connection dimension in accordance with GB 569
Type AS - through-type stop check valve with flange connection dimension in accordance with GB 2501
Type B - perpendicular-type stop check valve with flange connection dimension in accordance with GB 569.
Type BS - perpendicular-type stop check valve with flange connection dimension in accordance with GB 2501
3.2 Basic parameters
The basic parameters of stop check valve are according to Table 1.
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 check valve
3.3.1 See Figures 1 and 2 and Table 2 for the structures and basic dimensions of Types A and B stop check valves.
Figure 1 Type A and Type AS Figure 2 Type B and Type BS
Table 2
mm
Nominal pressure
MPa Nominal diameter
DN Structural dimension Flange connection dimension Hand wheel Lift
m Weight kg
Type A Type B D D1 D2 d0 b n Th. D0 □ Type A Type B
The through-type cast steel flanged seawater stop check 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 check valve A16 040 CB/T 3197-1995
The perpendicular-type cast steel flanged seawater stop check 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 check valve BS10 100 CB/T 3197-1995
1 Subject Content and Application Scope 2 Normative References 3 Product Classification 4 Technical Requirements and Test Methods 5 Test Methods and Inspection Rules 6 Marking and Packaging Additional Information
