Patent ID: 9233385
Filing Date: 2016-01-12
CPC Classification: B05B,B05C,G01K

Claim Text:
1. A two-component spray gun comprising: a housing having a pair of inlet openings positioned on top of said housing for insertion of an “A” and a “B” flexible plastic hose from respective “A” and “B” cylinders containing pressurized chemicals and a propellant therein, the pressurized chemicals and propellant used to prepare a polyurethane foam or a polyurethane froth, each “A” and “B” cylinder at a pressure between approximately 150-250 psi; said housing having a metering valve disposed within said housing; said housing having a removable plastic spray nozzle affixed to a front of said housing for dispensing the polyurethane foam or the polyurethane froth, said plastic spray nozzle comprising at least one thermochromic material disposed within or affixed thereupon said plastic nozzle; said thermochromic material changing color by measuring the temperature of either the high volume flow of pressurized chemicals or high volume flow of synthesized froth foam or both egressing through said plastic nozzle to illustrate to the end-user of the spray gun if the pressurized chemicals and propellant used to prepare the polyurethane foam or the polyurethane froth are at a minimum temperature for proper chemical cure of the “A” and “B” chemicals, the propellant comprising a fluorocarbon and an inert gas in which the propellant enters into the nozzle as a liquid component under the pressure of between approximately 150-250 psi and changes to a gaseous state component during travel through the nozzle and egress therefrom into the environment with turbulent flow between the liquid components, gaseous components and synthesized froth foam; and said nozzle having a pressure gradient between a variable orifice, said orifice being a minimum distance between a valve seat and a cylindrical tip portion of a metering rod, which as the orifice opens, the gradient expands increasing a distance at which the phase change occurs which increases a backpressure in the nozzle, which at least partially improves metering of dispensing at high flow conditions and displaying a color change in dependence upon temperature of the high volume flow of pressurized chemicals or high volume flow of synthesized froth foam or both.