(under subclass 451) Devices consisting of one or more closed tanks or receptacles having automatically controlled inlet and outlet valves for admitting water to the tank and discharging it therefrom, and also having means for equalizing the pressure between the tank and the boiler, whereby the water will fall by gravity into the boiler, the tank being located above the boiler.
SEE OR SEARCH CLASS
137, Fluid Handling,
156+, for gas pressure discharge of a liquid in general, and subclasses 386+ for liquid level responsive valves.
