| 摘要 |
PURPOSE:To eliminate power recovery losses caused as a result of change in hot water temperature by controlling the opening of a steam control valve during normal operation to its maximum within control range, using an opening sensor and an adjuster for setting the opening of a steam control valve. CONSTITUTION:An opening sensor 17 mounted on a steam control valve 4 detects its opening and sends a signal to an opening setter adjuster 18. The adjuster 18 is provided with a predetermined value intended to set the steam control valve 4 to a maximum opening within the control range and this predetermined value is compared with the opening signals to control the valve opening to the degree corresponding to the predetermined value. This arrangement serves to eliminate power recovery losses such as a throttling loss of the steam control valve 4 as a result of excessively high steam pressure relating to all types of fluctuation in hot water temperature or steam bypassing the turbine as a result of too low steam pressure.
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