Control Device and Method for a Quick-Acting Gate Valve of a Steam Turbine
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United States of America Patent
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Issued Date -
Mar 31, 2011
app pub date -
May 19, 2009
filing date -
May 20, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A control device for a quick-closing valve of a steam turbine including a relief valve for reducing a hydraulic pressure opening the quick-closing valve, and a relief valve control valve arrangement having at least three valves which are hydraulically interconnected with the relief valve in such a way that the relief valve does not close the quick-closing valve unless at least two valves of the relief valve control valve arrangement are switched to a quick-closing position. The system includes a test control valve arrangement for selectively reducing and increasing the hydraulic pressure opening the quick-closing valve when the relief valve is closed.
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