Spray discharge valves for atomising receptacles

Claim 1

A SPRAY DISCHARGE VALVE FOR ATOMISING RECEPTACLES SUCH VALVE COMPRISING A TUBE HAVING A CYLINDRICAL BORE, AN INTERNAL CYLINDRICAL VALVE SEAT SURFACE BEING FORMED BY SAID BORE AND A RECESSED ENLARGEMENT OF SAID TUBE BORE BEING PROVIDED AT ONE END THEREOF, A FLEXIBLE RESILIENT DIAPHRAGM OF RELATIVELY FLATTENED FRUSTO-CONICAL FORM EXTENDING COAXIALLY OUTWARDLY FROM THE SAID TUBE ADJACENT THE END THEREOF REMOTE FROM SAID RECESSED END, A THICKENED PERIPHERAL LIP TO SAID DIAPHRAGM FOR SECURING THE LATTER IN AN APERTURE IN AN APPROPRIATE RECEPTACLE, THE SAID TUBE, DIAPHRAGM AND LIP BEING FORMED OF A ONE-PIECE MOULDING OF A PLASTICS MATERIAL, A CYLINDRICAL PISTON HEAD WHICH IS OF SLIGHTLY LARGER DIAMETER THAN THAT OF THE CYLINDRICAL VALVE SEAT SURFACE WHEREBY SAID VALVE SEAT SURFACE NORMALLY GRIPS SAID HEAD TO BE FLUID TIGHTLY ENGAGED THEREWITH, AN AXIALLY GROOVED PISTON STEM OF SMALL DIAMETER THAN SAID PISTON HEAD AND CARRYING THE SAID HEAD, THE GROOVES IN SAID PISTON STEM EXTENDING AXIALLY PART WAY TOWARDS THE PISTON HEAD, A CIRCULAR FLANGE CARRYING THE SAID PISTON STEM AND FITTED INTO THE SAID DIAPHRAGM LIP, THE HEAD, STEM AND FLANGE BEING FORMED AS A ONE-PIECE MOULDING OF A PLASTICS MATERIAL, THE FLEXIBILITY OF THE DIAPHRAGM AND LENGTHS OF THE SAID TUBE AND PISTON STEM BEING SUCH THAT, ON FLEXING OF THE DIAPHRAGM, TO A DISCHARGE POSITION THE TUBE IS DISPLACED TOWARDS THE SAID FLANGE AND THE PISTON HEAD PASSES INTO THE RECESSED END OF THE TUBE, AND A HOLLOW CAP REMOVABLY FITTED OVER THE SAID TUBE AND HAVING A CAPILLARY DISCHARGE ORIFICE, THE CAP PROVIDING A STOP NORMALLY PREVENTING MOVEMENT OF THE DIAPHRAGM TO A FILLING POSITION WHEREIN THE GROOVES IN SAID PISTON STEM PROVIDE A BY-PASS PASSAGE PAST THE VALVE SEAT SURFACE.