Spray head for an aerosol container

In a spray head for a fluid dispenser, comprising a body having a connecting duct for sealingly receiving a delivery tube stub of an aerosol valve;

• a spray orifice;
• a chamber in said body connecting said connecting duct and said spray orifice;
• a piston member disposed in said chamber and presenting a needle member cooperating with said spray orifice;
• and spring means urging said piston member to said spray orifice, said spray orifice being sealed by the end of said needle member in an inoperative position, and the piston member being arranged to move against the force exerted by said spring means under the influence of an elevated pressure prevailing in said chamber, whereby the spray orifice is cleared by said needle member, the improvement which comprises that the rear face of the piston member, which faces away from the needle member, defines a wall of at least one substantially closed space which through at least one channel is in communication with at least one point, located in or near the spray orifice, for the injection of air from said closed space into the product stream to be sprayed through said spray orifice.