Fluid sprinkling – spraying – and diffusing – With cleaning means – drip collecting – waste disposal or soil... – Nozzle cleaner – flusher or drainer
Patent
1979-02-22
1981-01-20
Schacher, Richard A.
Fluid sprinkling, spraying, and diffusing
With cleaning means, drip collecting, waste disposal or soil...
Nozzle cleaner, flusher or drainer
239119, 239305, 239530, B05B 1502
Patent
active
042457858
ABSTRACT:
In a system for spraying liquid asphalt emulsion and solvent therefor, a hydraulic system including a pair of hydraulic motors is used to selectively drive a pair of pumps coupled to provide either liquid asphalt emulsion or solvent therefor to a flapper type check valve. The flapper type check valve readily passes liquid asphalt emulsion therethrough to a spray wand with backflow of the liquid asphalt emulsion to the pump for the solvent being blocked by a solvent check valve. When spraying of the liquid asphalt emulsion is completed, the solvent pump is turned on to force solvent at a relatively high pressure into the flapper type check valve to cleanse the hinged flapper mechanism within the check valve and then the components down-stream thereof including the spray wand. Accumulations of solidified asphalt emulsion which may prevent the hinged flapper mechanism from closing are eventually dissolved by the solvent which in the meantime flows through the open hinged flapper mechanism and toward the liquid asphalt emulsion pump. The liquid asphalt emulsion pump is protected by a liquid asphalt emulsion check valve which opens in response to the high pressure solvent so as to divert the solvent to a catch tank.
REFERENCES:
patent: 3674205 (1972-07-01), Kock
patent: 3690557 (1972-09-01), Higgins
patent: 3870233 (1975-03-01), Wilhelm
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