When starting the system relief valves is also turned on. The air is removed through the holes in the top of the float Cup. Condensate is set inside and outside of the float Cup. The float Cup is still submerged water condensate drain set. When the water arrives to make a cup float float valve lever upwards pressure, close the drain valve. The steam will gently flowing through vent holes to the top of the device. If the steam rising, floating cups, it will remain buoyant, but if there is any water condensate increased the floating Cup set to sink and holes. This kind of passive loop
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