normal we use pump to feed water to boiler.
Last night, I thaught an idea of water feed plan: using compress air. one compress air vessel, one feed water vessl, the volume of the former is twice of the later. pipe connect these two vessel, and there is one electromagnetic valve arrangedbetween these two vessels, this valve is control by boiler water level gauge sensor. The pressure of compress air is two time of boiler working pressure, when boiler water is low, the sensor will open the electo magnetic valve, compress air will go to feed water vessel, then the pressure of feed water vessel will increase, when its pressure above the boiler pressure, the check valve will open, and water feed into boiler. While the boiler water level is ok, the electromagnetic valve will close, the pressure of feed water vessel and boiler are same, the check valve will close. one time water feed cycle will be finish.
because my poor English, maybe you not get what I write.
Last night, I thaught an idea of water feed plan: using compress air. one compress air vessel, one feed water vessl, the volume of the former is twice of the later. pipe connect these two vessel, and there is one electromagnetic valve arrangedbetween these two vessels, this valve is control by boiler water level gauge sensor. The pressure of compress air is two time of boiler working pressure, when boiler water is low, the sensor will open the electo magnetic valve, compress air will go to feed water vessel, then the pressure of feed water vessel will increase, when its pressure above the boiler pressure, the check valve will open, and water feed into boiler. While the boiler water level is ok, the electromagnetic valve will close, the pressure of feed water vessel and boiler are same, the check valve will close. one time water feed cycle will be finish.
because my poor English, maybe you not get what I write.