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Check valve
Reference Standard CB/T3944 Flanged Stainless Steel Check Valve
This standard is applicable to the design, manufacture and acceptance of check valves for piping systems of liquefied gas carriers, bulk chemical tankers and ships with nominal pressure not higher than 2.5MPa and design temperature not lower than -165℃. The check valve of the pipeline system of other ship's corrosive medium can be adopted by reference.
Type
The types of check valves are specified as follows:
Type A - straight-through check valve with flange connection size and sealing surface according to GB/T 569-1965;
Type B - straight-through check valve with flange connection size and sealing surface according to GB/T 569-1965;
AS type - straight-through check valve with flange connection size and sealing surface according to GB/T 2501-1989;
BS type - straight-through check valve with flange connection size and sealing surface according to GB/T 2501-1989;
Basic parameters of check valve
| Type | Nominal pressure PN MPa | Operating temperature ℃ | Nominal diameter DN mm | ||||||
| ≤20 | 100 | 150 | 200 | 250 | 300 | 350 | |||
| Maximum allowable working pressure P MPa | |||||||||
| P2 | P10 | P15 | P20 | P25 | P30 | P35 | |||
| A、B | 1.0 | 0.95 | 0.86 | 0.81 | 0.76 | 0.71 | 0.66 | 0.36 | 65～125 |
| 2.5 | 2.38 | 2.15 | 2.01 | 1.89 | 1.77 | 1.66 | 1.59 | 20～100 | |
| AS、BS | 1.6 | 1.52 | 1.31 | 1.29 | 1.21 | 1.13 | 1.06 | 1.01 | 100～125 |
| 2.5 | 2.38 | 2.15 | 2.01 | 1.89 | 1.77 | 1.66 | 1.59 | 20～100 | |
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18098804580
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