Patent ID: 8434696
Filing Date: 2013-05-07
Classification: B05B

Abstract:
1. A nozzle assembly for spraying high pressure fluid against an object, the assembly comprising: a hollow housing body; a hollow tubular shaft member coaxially rotatable within the housing body and having a fluid inlet end within and near one end of said housing body, said shaft member having an outlet end near a second end of the housing body for securing a spray head thereto for rotation with the shaft, said shaft member having a central axial passage to conduct fluid axially from said inlet end through the passage to said outlet end, said body having a high pressure fluid inlet passage communicating with said central passage of said shaft; a regulating passage formed between said housing body and said shaft near said outlet end of said shaft; and a passage communicating between the central passage of the shaft and a portion of the outer surface of the shaft member, wherein pressure of said fluid within said regulating passage acts axially upon said shaft to counterbalance axial force on said shaft exerted by fluid pressure acting upon said inlet end of said shaft, wherein the housing body has an inlet bearing area supporting the inlet end of the tubular shaft member and has a single annular channel formed in the housing body around the inlet bearing area.