Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Patent
1990-07-19
1992-02-11
Hart, Charles
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
210409, 210446, 239575, B01D 2130
Patent
active
050873555
ABSTRACT:
An automatically self-flushing filter for use on overhead sprinkler irrigation systems, and the like, is disclosed. The filter includes a hollow cylindrical body (20), a removable screen element (30) mounted within the body (20), and a plunger (40) suspended within the body (20) by a length of elastic tubing (50). The plunger (40) is positioned for reciprocal movement through a debris outlet (28)between a retracted or debris discharging position, wherein the outlet (28) gap has a maximum width, and a filtering position, wherein the outlet (28) gap is closed. The plunger (40) is moved to its filtering position by pressurized water flowing through the body (20). Simultaneously, the water is filtered through the screen element (30) and passes out the clean water outlet (37) while debris accumulates within the body (20). When the water supply is shut off and the water pressure decreases, the plunger (40) is retracted to its debris discharging position. Accumulated debris is automatically flushed out of the body (20) through the debris outlet (28) by residual water flowing out of the system.
REFERENCES:
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patent: 2936958 (1960-05-01), Shames et al.
patent: 3782640 (1974-01-01), Kirschmann
patent: 3951379 (1976-04-01), Connelius
patent: 4064046 (1977-12-01), Gilger
patent: 4177145 (1979-12-01), Schumacher
patent: 4676438 (1987-06-01), Sesser
patent: 4717073 (1988-01-01), Bielka
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