ZECO 8 inch ball valve has two choices, you can choose floating ball valve or trunnion mounted ball valve, and you can choose casting or forging on the material. Valve casting quality is of prime importance for product life, personnel and environmental safety, particularly in high temperature and high pressure service as valve serves as one of pressure-containing equipment in process-controlled pipeline. Thus, castings are always certified firstly by the customers requiring strictly before a valve manufacturer is pre-qualified and approved as a qualified supplier.
1. ZECO 8 inch ball valve has cavity pressure relief design. When force created by cavity pressure is lower than the force created by line pressure, then contact between ball and seat ring is assured to provide a tight seal; When cavity pressure is higher than seat spring force plus line pressure, the self relieving action allows the valve seat to move slightly away from the ball surface. Therefore, any overpressure inside the body cavity is discharged into the pipeline to restore the balance between the body cavity and the pipeline (either upstream or downstream side);
2. ZECO 8 inch ball valve has emergency sealant injection fitting design, allowing external interventions to prevent stem leakage. In the maintenance, only through the emergency grease hole can be the valve stem and seat at the sealing structure for emergency maintenance and long-term maintenance, simple and convenient;
3. ZECO 8 inch ball valve has blow-out proof stem design, safety feature that functions to assure stem sealing at all pressure;
4. ZECO 8 inch ball valve has back-up metal to metal sealing design, when primary resilient-seat material is deteriorated by fire, the metal-to-metal provides shutoff.
ASTM A182 F316
ASTM A182 F316 + PTFE
ASTM A276 316
Graphite + SS316
ASTM A193 B7
ASTM A194 2H
ASTM A216 WCB