PROBLEM TO BE SOLVED: To constantly keep the water level of a deaerator stably at a desirable water level even when the water level fluctuates excessively to a high level side, and lower the temperature of condensate to the deaerator to a desirable temperature even when temperature of the condensate at an outlet of a gas feed water heater.;SOLUTION: A condensate temperature regulating valve control circuit 35 is provided with a control loop 16, a control loop 37 and a low value selector circuit 38. Among condensate demand signals from the control circuits 16, 37, a low value is selected and outputted as a valve travel command to a gas feed water heater outlet condensate temperature regulating valve 8. A condensate relief regulating valve control circuit 36 is provided with a control loop 39, a control loop 40 and a high value selector circuit 41. Among condensate relief flow rate demand signals from the loops 39, 40, a high value is selected and outputted as a valve travel signal to a condensate water relief regulating valve 11.;COPYRIGHT: (C)2000,JPO
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