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The deluge alarm valve is a one-way valve which can be opened by electric, mechanical or other means to make the water flow into the system automatically in one direction and alarm at the same time.
| Type | ZSFG100 | ZSFG150 | ZSFG200 |
| Nominal diameter(mm) | DN100 | DN150 | DN200 |
| Rated working pressure(MPa) | 1.2 | 1.2 | 1.2 |
| Strength test pressure(MPa) | 4.8 | 4.8 | 4.8 |
| Friction resistance | <0.07 | <0.07 | <0.07 |
| Start time(s) | <15 | <15 | <15 |