The key part metal bellows,with the lower end welded to the valve stem and the upper end welded to the connecting plate. Form a metal barrier between the medium and the atmosphere to ensure zero leakage of the valve stem.
Fugitive emission test of bellows: 100% pass according to ISO15848-A
Welding of bellows assembly: microcomputer controlled welding speed to ensure the quality of the key part.
| Name | Material |
| Body | WCB、WC6、CF8、CF8M |
| Seat | 13Cr、Stellite |
| Disc | WCB+13Cr、Stellite |
| Bellows | SS304、SS316L |
| Stem | 20Cr13、F304、F316 |
| Bonnet | WCB、WC6、CF8、CF8M |
| Nominal Pressure | PN(MPA) | |
| Test Pressure | Shell Test | 1.5 x Pr |
| Sealing Test | 1.1 x Pr | |
| Air Test | 0.6 | |
| Bellows Assembly Test | 1.5 x Pr | |
| Suitable Temp | -196℃~600℃ | |
| Note: Pr is the pressure rating of the material at room temperature, the unit is MPa | ||
According to the performance of the medium, temperature, pressure, flow rate, and other characteristics combined
with the process, operation, safety and other factors, select the corresponding valve specifications.
