Patent ID: 7497389
Filing Date: 2009-03-03
Classification: A62C,B01F,B05B,F04B

Abstract:
1. An airless spray pump system for spraying a binder solution having suspended particles which are non-abrasive for coating a product therewith, said system comprising a reservoir for containment of a supply of said binder solution, mixing means in said reservoir for maintaining said solution in a homogeneous state, an inlet check valve connected to said reservoir; a pump connected to an outlet port of said inlet check valve for operating said inlet check valve to an open position during an upstroke of a piston of said pump to draw a volume of said solution through said inlet check valve and into a chamber of said pump and simultaneously forcing, under high pressure, solution contained in a transfer chamber of said pump out of said pump to a pressure control unit of a spray apparatus; said inlet check valve having an inlet port thereof connected to said reservoir by a suction hose, suction in said hose being generated by the upstroke of said piston in said pump, and an outlet port connected to said chamber of said pump through a union pipe, and a poppet head secured to a poppet stem axially displaceable in said inlet check valve with said poppet head spring-biased against a valve seat adjacent said outlet port, said piston when displaced on a return stroke applying pressure against said solution in said chamber and forcing said inlet check valve to close under said pressure preventing said solution to flow back to said reservoir and simultaneously operating a transfer check valve of said pump to open to transfer solution from said chamber to said transfer chamber and forcing a portion of said solution under high pressure to said pressure control unit, said solution when displaced through said inlet check valve and said transfer check valve causing a washing action of parts in contact with said solution to thereby prevent particles in said solution from sticking or settling down on said parts in said inlet check valve and said pump.