Patent ID: 9114365
Filing Date: 2015-08-25
Classification: B01D,C02F,F16K

Abstract:
1. A shut-off valve for use in a filtering system having a reverse osmosis filter supplying a permeate storage tank, the shut-off valve comprising: a housing defining an interior in fluid communication with a water inlet for connecting to a water supply, a water outlet for connecting to the reverse osmosis filter, a permeate inlet for connecting to the reverse osmosis filter, and a permeate outlet for connecting to the permeate storage tank, the housing having a fluidic network with a flowpath that connects the water inlet and the water outlet; a diaphragm plate forming a portion of the fluidic network within the interior; a piston within the interior for selectively opening and closing the flowpath, the piston having a central body portion extending between opposing first and second ends, wherein the piston is rigid and monolithically formed; a first diaphragm coupling to the first end of the piston and the diaphragm plate; and a second diaphragm coupling to the second end of the piston and the diaphragm plate, wherein as permeate pressure changes occur at the permeate outlet, the piston automatically rotates and, thereby, the opposing first and second ends rotate to close the flowpath based on deflection of the first and second diaphragms in response to the permeate pressure change of the permeate storage tank being substantially full, and the piston automatically rotates to open the flowpath based on deflection of the first and second diaphragms in response to the permeate pressure change of the permeate storage tank dropping below a predetermined amount as an indication of being partially empty.