Selection recommendations：
| Class |
Rated pressure（MPa，20℃时） |
Applicable Scenarios |
Typical materials |
| Class 150 |
1.93 |
Low-pressure water, steam, and civil gas pipelines |
WCB carbon steel, ductile iron |
| Class 300 |
5.17 |
Petrochemical medium and low pressure raw material transportation, urban pipeline network |
WCB carbon steel, A351 CF8 stainless steel |
| Class 600 |
10.34 |
High-pressure steam pipelines, process pipelines for oil refineries |
WC6 chrome-molybdenum steel, A182 F316 |
| Class 900~2500 |
15.51~42.03 |
High-pressure natural gas long-distance pipelines, hydrogenation reaction units |
A182 F316L, Hastelloy |
Application：
Petrochemical: Shut-off valves for long-distance crude oil pipelines (Class 600, WCB carbon steel), inlet and outlet valves for fractionating towers in refineries (Class 900, WC9 chrome-molybdenum steel);
Natural Gas: Shut-off valves for distribution stations in long-distance natural gas pipelines (Class 1500, A182 F316L, resistant to sulfur corrosion);
Power: Gate valves for steam pipelines in thermal power plants (Class 600, WC6 chrome-molybdenum steel, resistant to 450°C);
Water Conservancy: Shut-off valves for trunk lines in large-scale water diversion projects (Class 300, DN 1000, double-disc structure, suitable for large flow rates).
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