Integral orbit ball valve, size range DN50-DN700,pressure range PN150LB-1500LB.it is designed as top entry structure that can be checked and maintained on line. its fire-proof design makes the pipe system more safer. its grind-endurance metal seated surface ensures its capacities of longer service duration, wider temperature acceptance and more extensive medium application. the other features include no lubrication and wornout on sealing surface when turning on or off, small operating moment, easily operating and so on.