Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1997-01-09
1999-05-11
Freay, Charles G.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
417279, 417507, 417510, 137540, 13754319, F04B49/03;49/22
Patent
active
059020946
ABSTRACT:
A pressure washer is powered by a prime mover, e.g., an electric motor or an internal combustion engine, and has a flow control valve. The valve has a housing containing a piston assembly and the assembly has a mechanism coupled to it for controlling prime mover power. The piston assembly includes a first piston sealing against the housing and dividing the housing interior into two chambers. Such first piston is spring-biased to a first position during periods when no output flow is being demanded from the washer. The assembly also has a second piston spring-biased to seal against the first piston during periods of no flow. When flow is demanded by opening the nozzle, the pressure in the second chamber diminishes. And when the difference between the pressure in the second chamber and that in the first chamber exceeds a predetermined value, the assembly shifts to a second position, causing the mechanism to actuate the prime mover.
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Hoenisch Herb
Kern Robert D.
Ruehlow Gerald C.
Sodemann Wes
Yang Fred
Freay Charles G.
Generac Portable Products, LLC
Moses Daniel E.
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