Type formulation method of fire-fighting ball valve
Fire ball valve model by class, group code and sphere seal code, nominal pressure, nominal diameter, and pipe connection form code, forms are as follows:
| ball seal type | code no. |
| one-way seal | － |
| two-way seal | S |
| table 3 | |
| connecting with piperoad type | code no. |
| two-end flange | F |
| two-end thread | L |
| one end flange, one end thread | － |
Model example
End flange, end thread, nominal diameter 65mm, nominal pressure 1.6 MPa two-way seal fire ball valve model for: FQS65/160
Two end flange, nominal diameter 50, nominal pressure 4.0 MPa one-way seal fire ball valve model for: FQ50/4.0 F
