Improvement of the Driving Device of Dg700 Ball Valve

The article begins with a brief review of the problems now presented in the driving device of Dg700 ball valve, then explains the principles of the executing mechanism, driving device, remote controlled operation, automatic pressurized sealing and emergent break-off, and finally introduces how the new driving device (QY-170 Pneuhydraulic driving device) was working on site at trial stage.