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We just caught up with an issue like the main steam inlet control Valve was not opening above 20% when the command to increase the Load was given. The unit was taken out and exercised to confirm any sort of issue with the servo valve, however it was opening wide 100% without any issues. Taking back into service, the issue remains the same.
Am just expecting like would there be something mechanically wrong? Just thinking can Steam Pressure, when getting in, make some kind of displacement in the Flange Disc that in turn stops it moving above certain area colliding with Valve cover? and when steam pressure not available, it moves as if nothing has happened.
Can someone share their view/experience on the same.
Thanks
Am just expecting like would there be something mechanically wrong? Just thinking can Steam Pressure, when getting in, make some kind of displacement in the Flange Disc that in turn stops it moving above certain area colliding with Valve cover? and when steam pressure not available, it moves as if nothing has happened.
Can someone share their view/experience on the same.
Thanks