Liquid spray gun accessories

A selectively removable external attachment for a conventional liquid spray device, said liquid spray device having a body with an exit nozzle at one end thereof and a handle having an upstream distal end at the other end of said body, an attachment means at the upstream distal end of said handle for attaching said liquid spray device to a source of pressurized air in the range of 0 to over 100 PSI and a valve actuating means, said external attachment being employed for reducing the pressure of said pressurized air entering said liquid spray device to a pressure level of 10 PSI or less at the exit nozzle while substantially maintaining the same volume of air to said spray device comprising:

• a venturi assembly for attaching in series between said attachment means of said spraying device and said source of pressurized air, said venturi assembly comprises a first downstream and a second upstream interconnected body portions, said second upstream portion having a conical shaped passageway at its upstream end with a cylindrical passageway extending downstream therefrom, said first downstream body portion having a conical shaped passageway at the downstream end and a cylindrical passageway extending therefrom upstream, said cylindrical passageways of said body portions having an abutting restrictive relationship whereby a venturi is formed, a plurality of bores extend from the outer surface of said second upstream body portion to the venturi area for allowing ambient air to be drawn into said venturi area by the action of the venturi to mix with the pressurized air from said source entering the upstream of said external attachment thereby reducing the pressure of said air prior to entering said spray device while substantially maintaining the volume of pressurized air entering said spray device that is required by said spray device for normal operation.