Patent ID: 9399230
Filing Date: 2016-07-26
CPC Classification: B05B,B08B

Claim Text:
1. A fluid nozzle for use in a high pressure water jetting system comprising: a stationary housing configured to receive a source of high pressure water, the housing having defined therein an inner bore; a rotating member disposed within the inner bore, the rotating member including a shaft having an inlet end and a nozzle extending outwardly of the housing; a central passage within the shaft for communicating high pressure fluid to the nozzle, the shaft including communication passages to provide fluid from the central passage to a forward fluid pressure chamber defined between an outer peripheral surface of the shaft and the housing; a leakage path defined between the housing and the inlet end of the shaft; a rear fluid pressure chamber defined between the shaft and the housing and configured to receive fluid from the leakage path; and a restriction defined between the housing and the inlet end of the shaft as an annular gap, the restriction configured to receive fluid from the rear fluid pressure chamber via the leakage path, and transport it to a chamber communicating with the atmosphere, wherein a volume of the restriction is configured to decrease when the shaft moves axially forward.