Fluid sprinkling – spraying – and diffusing – Selectively usable or variable diverse terminal outlets
Reexamination Certificate
2002-11-18
2003-11-25
Evans, Robin O. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Selectively usable or variable diverse terminal outlets
C239S440000, C239S441000, C239S442000, C239S443000, C239S446000, C239S447000, C239S448000, C239S525000, C239S526000, C137S882000
Reexamination Certificate
active
06651910
ABSTRACT:
INTRODUCTION
This invention relates to a high pressure water control device such as a dump gun for firing high pressure water to break up concrete.
Known dump guns commonly include poppet valves to control the flow of water between a high pressure nozzle and dump. The water can be dumped at low pressure to the surroundings or returned to a water reservoir.
Poppet valves cannot guarantee pressure balance as cone and seat diameters are subject to tolerances and change/wear during use. Also, poppet valves rely on the operator's hand force to maintain the seal. If this force is relaxed leakage will occur without the operator being aware of any handle movement. This type of leakage leads to very rapid valve/seat erosion failure. Furthermore, poppet valves are very sensitive to erosion failure. This normally results in the seat and cone being scrapped. Erosion failure at high pressures is rapid, unpredictable and almost impossible to avoid.
The invention seeks to overcome or mitigate these drawbacks.
SUMMARY OF THE INVENTION
According to one aspect of the present invention, there is provided a high pressure water control device comprising a water inlet, a high pressure water outlet, a low pressure water outlet and a valve for selectively communicating the inlet with one or other of the outlets, wherein the valve is a spool valve.
According to another aspect of the invention there is provided a high pressure water control device in the form of a high pressure water gun comprising a water inlet, a high pressure water outlet, a low pressure water outlet, a spool valve for selectively communicating the inlet with one or other of the outlets, an elongate nozzle terminating in said high pressure outlet and a barrel surrounding the nozzle and terminating in said low pressure outlet.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings.
REFERENCES:
patent: 555062 (1896-02-01), Murphy
patent: 618412 (1899-01-01), Haas et al.
patent: 2567176 (1951-09-01), Ballard
patent: 2635010 (1953-04-01), Sanders et al.
patent: 3822724 (1974-07-01), Clapp et al.
patent: 3930616 (1976-01-01), Winter
patent: 4530469 (1985-07-01), Muck
patent: 4541568 (1985-09-01), Lichfield
patent: 4665944 (1987-05-01), Wallace et al.
patent: 4784330 (1988-11-01), Hammelmann
patent: 5297777 (1994-03-01), Yie
patent: 5349982 (1994-09-01), Goldsmith
patent: 5423348 (1995-06-01), Jezek et al.
patent: 5524821 (1996-06-01), Yie et al.
patent: 5794854 (1998-08-01), Yie
patent: 5975429 (1999-11-01), Jezek
patent: 31 24 125 (1983-01-01), None
patent: 0 273 677 (1988-07-01), None
patent: 2 049 883 (1980-12-01), None
patent: 2 204 664 (1988-11-01), None
patent: A 8-24728 (1996-01-01), None
patent: A 9-85192 (1997-03-01), None
Calder Limited
Evans Robin O.
LandOfFree
High pressure water control device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High pressure water control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High pressure water control device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3176218