Coosai series API butterfly valve, adopts precise elastic sealing ring and tri-eccentric multilayer metal to metal seal construction, it is widely used in the pipe line of metallurgy, power, petrochemical, drainage and ministry construction for medium temperature≤425℃, to perform regulating flow, and cutting medium. It is divided to metal to metal seal and soft seated two types, and can be lined with rubber or fluorine.
| Design reference | API | ASME |
| Design standard | API609 | ASME B16.5 |
| Face to face | ASME B16.10 | |
| Flanged ends | ASME B16.5 | |
| Test &inspection | API598 | |
