Hydromassage nozzle

Claim 1

Hydromassage nozzle of the type comprising an adjustable body with a central passage shaped like a venturi tube on the axis of which is arranged an air suction passage while water under pressure enters transversely said central duct upstream of the inlet of said venturi tube so that passage of water under pressure through the constriction of the venturi tube causes suction of air which mixes intimately with said water in said venturi tube, the adjustable body being furthermore housed in an adjustable manner around its own axis in a substantially cylindrical casing open at both ends and fixed to the wall of the tub or pool in such a manner that at the end turned toward the interior of the tub is seated the outlet of the venturi tube while the other end puts said air suction passage in communication with an air suction duct, there being made in said cylindrical casing at least one aperture for connection of a duct supplying water under pressure, characterized in that said air suction passage consists of a duct which penetrates the constricted section of said venturi tube and said constricted section is movable with respect to said duct forming a passage for air suction between an open position in which passage of water through said constricted section is allowed and a position of complete shutoff of said water passage, there being provided in said air suction duct a control valve which is opened by the negative pressure generated in the constricted section of the venturi tube when water under pressure passes therein.