What should be done if the steam turbine quick-shut valve gets stuck?
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The valve gets stuck when trying to shut it down at the planned shutdown speed of the steam turbine, and it cannot be closed. How should this be handled?
There’s no other way; one must manually close the steam isolation valve.
The quick-shut valve is also known as the main steam valve; jamming of this valve is usually caused by the quality of the oil. If the speed control valve is not airtight and the emergency shut-off valve cannot be closed completely, it is particularly dangerous for the turbine. At this time, special attention must be paid to the turbine speed when disconnecting from the generator. Quickly close the isolation door in front of the quick-shut valve.