Importance

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Abstract

A fluid nozzle for use in a high pressure water jetting system includes a housing to be fixed to a source of high pressure water. The housing receives a rotating member and an inner peripheral bore. The rotating member includes a shaft received within the housing, and a nozzle extending outwardly of the housing, the nozzle having openings extending along a direction having a component both forwardly along an axis of rotation of the shaft and the nozzle, and radially outwardly relative to the central axis. A central passage within the shaft communicates high pressure fluid to the nozzle. The shaft includes leakage paths to provide leakage fluid from the central passage to an interface between an outer peripheral wall of the shaft and an inner peripheral wall of the bore in the housing. The leakage paths communicate fluid to a forward fluid pressure chamber, and to a rearward fluid pressure chamber. A pressure loss to the rearward fluid pressure chamber is greater than a pressure drop at the forward pressure chamber.

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First Claim