Clayton Manufacturing Company

William S Jennings

Clark E Fegraus

An apparatus and method of supplying feedwater to a forced flow boiler or the like as described. A positive displacement pump having a plurality of discrete pumping elements is arranged to pump feedwater from an inlet to the boiler. The pump includes bypass valves which, when open, disable the pumping action of an associated pumping element. Control means responsive to the demand for water in the boiler are arranged to disable a selected number of the pumping elements so that the rate of water supplied by the remaining elements, if operated continuously, would just exceed that required. The control means is further arranged to disable at least one of the remaining pumping elements on a periodic basis so that the ratio of time that the element is enabled to the time for one period multiplied by the water flow rate supplied by said element, if operated continuously, equals the difference between the total demand for water and the rate supplied by the pumping elements enabled on a full-time basis.

Method and apparatus for supplying feedwater to a forced flow boiler

A pressurized hot fluid washer includes a combination pumping unit driven by a closed hydraulic system which applies driving impulse forces to an interlocked liquid pump member and a fuel pump member. The liquid pump and fuel pump are hydraulically interlocked so that when liquid is not being discharged through the cleaning gun, the fuel will definitely be stopped. A static pressure line senses the pressure downstream of the liquid pump and transmits the pressure to one end of a spring biased by-pass spool valve. At a predetermined liquid pressure, the spool valve will sequentially close a hydraulic conduit first to deactivate the fuel pump and then open a by-pass conduit to deactivate the liquid pump member. Thus, both the fuel pump and the liquid pump will be automatically stopped, for example, when the cleaning gun is not being used. In addition, a differential area piston is provided in the hydraulic system between the by-pass spool valve and the fuel pump. The differential area piston reduces the high pressure required of the water supply to a more suitable pressure for the fuel pump.

Growing community of inventors

West Covina, CA, United States of America

William S Jennings