Abstract: A high pressure fluid blast gun (10) has a valve assembly (12) and a handle assembly (14) removably connected to each other. Valve assembly (12) has a valve body (16) including a valve chamber (18) having a cartridge therein including a valve sleeve (30), and a slidable valve member (42). A plug (44) retains the cartridge in valve chamber (18). The handle assembly (14) has a mounting plate (70) and a handle grip portion (75) extending therefrom. A guard (76) extends from the handle grip portion (75) to mounting plate (70) for enclosing the trigger (78). A pair of dump passages (62) in valve body (16) communicate with dump port (66) in face (28) of valve body (12). A dump passage (94) in opposed face (71) of handle assembly (14) is in communication with dump port (66) and extends to atmosphere for relief of the high pressure water when trigger (78) is manually released thereby to provide a low pressure flow of water from high pressure supply conduit (24). The embodiment of FIGS.

Abstract: A high pressure spinning nozzle for cleaning material from a surface such as the inner walls of a heat exchanger tube, for example, includes a tubular body having an open front end and a plug in its rear end, a rotor in the body bore having an internal flow passage and inclined and skewed orifices in its front wall that cause the rotor to spin during operation, axial and radial passages in the body to feed high pressure water to the rotor flow passage, a water bearing between the rear of the rotor and the plug, and ports in the body to automatically regulate the pressure of the water bearing.

Abstract: In accordance with an illustrative embodiment of a high pressure water blast gun as disclosed herein, such gun includes a valve body having inlet and outlet ports and an internal chamber, and a removable valve cartridge in the chamber which includes a guide tube and a valve closure element slidably arranged in the tube. The closure element includes a leading end portion having a peripheral edge that engages an inclined seat surface in the guide tube with line contact on a first diameter, and a trailing end portion which is sealed against the guide tube on a second diameter which is greater than the first diameter to provide a hydraulic bias force that tends to close the valve against the seat. Both hand and foot operated embodiments are disclosed.

Abstract: A regulator for a high pressure water blast system includes a body which houses a replaceable valve cartridge that includes a tubular seat member and an axially slidable valve element. The valve element is biased toward closed position by an adjusting knob that houses a spring-loaded plunger which engages the valve element. The seat member is hydraulically biased against a stop shoulder and the valve element is hydraulically biased toward the adjusting knob. The design of bias areas and spring rates is such that the adjusting knob can be easily operated by hand. The seat member and valve element provide a replaceable cartridge assembly so that all wear parts can be replaced, when needed, in the field.