YFL High pressure forged steel top entry ball valves are widely installed in high pressure applications for convenient online maintenance in oil & gas production and transporoation, oil refinery, petrochemical, metallurgy and power etc. YFL High pressure forged steel top entry ball valves technical features: 1. Top entry structure makes the ton entry ball valves can be online maintenance without removing the valve from the pipeline. 2. One piece forged body with sufficient wall thickness and high strength bolts can stand high working pressure and can be weleded directly to the pipeline. 3. Seat with bevel angle design eliminates accumulation of impurities. 4. Realize reliable sealing through pre-load spring under zero pressure and lower pressure condition. Ensure excellent sealing performance during fire condition with additional expanding graphite. 5. When there are damages between the valve seat and ball, emergency sealing can be achieved as secondary sealing with gre