| 摘要 |
PURPOSE:To enable rapidly closing of a steam valve by providing a mechanism for interrupting the supply of operating oil from the main oil pump of an emergency damping valve at the time of operating the emergency damping valve, in the turbine provided with the mergency damping valve which rapidly closes the steam valve in an emergency of the turbine. CONSTITUTION:When control oil (a) is continued to be discharged at the time of turbine tripping, emergency interrupting oil (b) is discharged, and the emergency damping valve 24 provided at the lower part of a hydraulic cylinder 6 is fallen. Thus, oil within a pressure oil chamber 8 is discharged from a port 25, and a main valve 1 is closed. In this case, the compression spring 29 which presses down a spool, is provided at a supply route (c) at a test pilot 9 and its lower part, and is used as an interrupting mechanism. At the time of turbine tripping, the emergency interrupting oil (b) at the lower part of the test pilot 9 is discharged, and simultaneously, the spool is pressed down by the compression spring 29 to block the port 30 of an oil path 11 for the control oil (a). By this procedure, the supply of the control oil (a) to the hydraulic cylinder (6) is instantaneously interrupted. |
