| 摘要 |
A feedwater regulator for controlling the water level in a steam drum comprises a bellows defining a variable space connected to a connecting tube connecting a generator with the control element of a feedwater regulating valve. The generator is formed of concentric inner and outer tubes that are inclined with respect to the horizontal. An upper end of the inner tube is connected to the steam space of the steam drum with the lower end being connected to the water space of the steam drum. The outer tube defines a control space with the inner tube which is filled with water. The control space is connected to the control element of the regulating valve over the connecting tube. A decrease in water level pressurizes the water in the control space to open the regulating valve. The variable space of the bellows is set to a desired value and to adjust the overall relationship between regulating valve position and steam during water level.
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