Abstract: A control valve for a resonant burner having a burner space for receiving active substance through a conduit with an atomizing nozzle discharging into the space is disclosed. When the valve is shut off to terminate flow of the active substance through the valve to the burner conduit, a spring action in the valve tends to withdraw the active substance from the conduit by creating a suction effect therein.

Abstract: A mist generator particularly for spraying pesticides on plants includes at least two exhaust nozzles from which generated mist is emitted from the mist generator, the nozzles being jointly fed by a common pulsating combustion chamber and extending in generally opposite directions.

Abstract: The housing of an electrolytic purification apparatus defines a receiving chamber and an electrolytic cell. The receiving chamber communicates with a filling aperture at the top of the housing which is upwardly open in the operating position of the apparatus. A first conduit connects a bottom portion of the chamber with an inlet portion of the cell, and a second conduit connects an outlet portion of the cell, upwardly spaced from the inlet portion but lower than the filling aperture, with a discharge aperture at the lower end of the housing. The chamber, cell, and conduits define a continuous path of liquid flow from the filling to the discharge aperture, the path extending downward in the chamber, upward in the cell, and downward again in the second conduit. Two electrodes, offset from the flow path in the cell in opposite, transverse directions, are supplied with direct current for passage of the current in the cell through liquid flowing in the afore-described flow path.