Other

Pyramid Plastics, LLC

Diaclear, Inc.

Raymond E Portyrata

Thomas L Wallace

A filtration and backwash system for a water source such as a swimming pool is provided including a fluid source, a pump, a filter and a specially designed five-port valve which is easily adaptable for automatic use in the filtration mode and in the backwash mode. The valve uses a rotatable deflector plate which is positioned to divert the fluid in one direction in the valve for the filtration process and is positioned to divert the fluid in the other direction in the valve for the backwash process. An automatic timing device is also provided and is particularly suitable for use in conjunction with the valve whereby no manual intervention or electronic means is needed to change the valve from the filtering mode to the backwash mode or vice versa. The timing device automatically senses the pressure buildup in the filtration system due to accumulation of debris in the filter and automatically changes the valve from the filtration mode to backwash mode when a predetermined system pressure is exceeded. The timing device then gradually returns the valve to its initial filtering position to continue the filtering process.

Automatic valve assembly for water circulation systems

Illuminated mirror

An underdrain for use with granular type liquid filtering systems including a plate of an inverted dished configuration having a plurality of laterally facing slots defined therein, the slots being defined by an upper edge and an associated lower edge, the upper edge being positioned almost directly above the lower edge such that the slots face horizontally outward, the slots being positioned upon the dished plate in a spiral array with each slot being formed by shearing of the plate material between two cutting edges positioned above and below the plate, the upper edges presenting downwardly facing arcuate edges and the lower edges presenting upwardly facing arcuate edges to define a slot having opposed facing arcuate sides, the plate may further define a flat horizontally extending imperforate annular center-section within the spiral array of slots and a flat horizontally extending imperforate annular outer-section extending about the spiral array of slots, the center-section may define a central aperture therein.

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North Haven, CT, United States of America

Raymond E Portyrata