| 摘要 |
PURPOSE:To enable a trip valve to be repaired and replaced while a turbine is in operation, by providing a valve, which can isolate the trip valve from a fluid pressure source, in an inlet side of the trip valve switched by operation of an emergency trip device. CONSTITUTION:When a turbine is in normal operation, controlled pressure oil CO, being supplied via a feed oil pipe 25, mechanical trip valve 1, outlet side pipe 26, lock out valve 21, outlet side pipe 27 and an electrical trip valve 22, acts as the emergency pressure 2 of oil on a valve (not shown in the drawing) provided in an inlet or the like of the turbine. While the controlled pressure oil CO, if either one of the trip valve 1 or 22 is switched to a trip side, is collected to an oil tank 3 or 28, performing a turbine trip by rapidly closing the valve. In the above, when the trip valve 1 is repaired and/or replaced, a pressure oil main valve 24 is closed with the lock out valve 21 being left as locked out, and under this condition the valve 1 is repaired and replaced. |
