Adjustment of turbine control valve travel
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How is the SA value of the control valve beam in a plate-type steam turbine checked? Is it by using a feeler gauge to verify that the speed shutdown valve on one side is properly installed and in use, once the control system has been installed? If this value is not appropriate, how can it be adjusted?
For this, it is necessary to remove the valve beam, move the valve disc up and down by hand, and measure it with a depth gauge
This post was last edited by Anhui Liu Hua on 2021-11-14 at 17:28. 1236123612361236 If this value increases, it indicates wear; the rivets on the valve disc need to be removed, the threads adjusted to control the movement of the valve disc, and then the rivets reattached to prevent loosening
How exactly is it measured? Is the dial indicator reading resulting from the rebound after releasing the pin here equal to the flight attendant SA?
This method cannot be used for this purpose; it is used to adjust the stroke of the oil actuator after the turbine has been overhauled (provided that the exact value of the free stroke can be determined during the overhaul process). It is not possible to directly measure the free stroke or the stroke of each valve disc