Fluid sprinkling – spraying – and diffusing – With system fluid relief or return to supply – By pressure responsive means
Patent
1993-08-20
1995-03-14
Merritt, Karen B.
Fluid sprinkling, spraying, and diffusing
With system fluid relief or return to supply
By pressure responsive means
239570, 239124, B08B 302
Patent
active
053970543
ABSTRACT:
A pressure jet cleaning appliance having a pressure pump (10) driven by a drive (11). The appliance includes a conduit having a primary line (14) for directing fluid into a spray gun (15) and a bypass line (19) for recycling fluid through the conduit when the spray gun is turned off. A control valve (18) has a reciprocal piston (28) responsive to fluid pressure within the primary line such that the piston moves into a closed position thereby directing fluid through the bypass line when the spray gun is turned off. The piston is directly connected to a control element (22) in the drive such that movement of the piston is translated into displacement of the control element. With this configuration, the piston actuates the control element to reduce the speed of the drive when the piston is in the closed position and to increase the speed of the drive when the piston is in the open position.
REFERENCES:
patent: 3147767 (1964-09-01), Goss
patent: 3977603 (1976-08-01), Magee, Jr.
patent: 4238073 (1980-12-01), Liska
patent: 4385640 (1983-05-01), Iverson
patent: 5228622 (1993-07-01), Murphy et al.
Dolmar GmbH
Merritt Karen B.
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