| 摘要 |
PURPOSE:To safely and surely drive a machine, by discharging compressed air in a runner chamber under a stage, in which an inlet value is opened to at least a certain opening, further holding a drain valve on a leakage water drain pipe of a guide vane to an opened condition at least before a start of exhaust. CONSTITUTION:An inlet valve (side valve 13, downstream seal ring 12, main valve 10) is started to open by a full closing signal for a leakage water drain valve 15 of a guide vane. If the valve 10 is opened to at least a predetermined opening, the valve 13 is closed and an exhaust valve 14 is opened to discharge compressed air in a runner chamber. Here a drain valve 16 on a leakage water drain pipe of the guide vane opened to the inlet part of a runner 1 is continuously held to an opened condition at least before a start of exhaust. In this way, since discharge of guide vane leakage water can be always ensured to substantially continue a lift mode of a water level, a safely operating condition can be continued. |
