metallurgical valve
| nominal diameter(dn)（mm） | dn200-dn1000 | dn700-dn4000 |
| workers said pressure (mpa) | ≤0.6 | ≤0.25 |
| work pressure（mpa） | ≤0.6 | ≤0.25 |
| test pressure | case | 1.5work pressure |
| seal | 1.1work pressure | |
| sealing rating | aorb | |
| medium temperature (℃) | ≤500 | |
| applicable medium | gas \ smoke\air |