Fire butterfly valve is also called flip valve, is a simple structure of the control valve, can be used for the switch control of low-pressure pipeline media butterfly valve refers to the closing part (valve disc or butterfly plate) for the disc, revolving around the valve shaft to achieve the opening and closing of a valve.
Butterfly valves are widely used in various fire fighting systems, such as buildings, factories, warehouses, shopping malls, hospitals, etc.
| DN | NPS | L | ΦA | ΦB | ΦC |
| 50 | 2'' | 90 | 50 | 57 | 60.3 |
| 65 | 2 1/2'' | 97 | 61 | 69 | 73 |
| 80 | 3'' | 97 | 78 | 85 | 88.9 |
| 100 | 4'' | 116 | 101 | 110 | 114.3 |
| 125 | 5'' | 134 | 127 | 137 | 141.3 |
| 150 | 6'' | 134 | 150 | 164 | 168.3 |
| 200 | 8'' | 148 | 202 | 214.4 | 219.1 |
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