Patent ID: 8006920
Filing Date: 2011-08-30
Classification: B05B

Abstract:
1. A nozzle assembly for mounting to a source of a high pressure fluid to spray the fluid, the nozzle assembly comprising: a housing having an inlet end for mounting to a source of high pressure fluid, an outlet end, an outer surface, and an inner surface defining an interior cavity; a shaft having an axis of rotation, an exterior surface, a fluid inlet end and an outlet end, said shaft having a central passage to axially conduct fluid from said inlet end of the housing axially from and through the inlet end of the shaft to said outlet end of the shaft and having a second passage between the central passage of the shaft and the exterior surface of the shaft, the shaft rotatably mounted within the interior cavity of the housing; at least a portion of the inner surface of the housing and at least a portion of the exterior surface of the shaft defining a pressure chamber and further defining a regulating passage to allow a portion of the fluid to flow through the pressure chamber and between the exterior surface of the shaft and the interior surface of the housing; wherein fluid under pressure in the pressure chamber causes a balancing force on the shaft in a direction substantially parallel to the axis of the shaft to completely counteract any axial force exerted by high pressure fluid from the source flowing into the inlet end of the shaft; and a spray head attached to said outlet end of the shaft to spray the fluid.