Patent ID: 6955277

Claim:
A device for dispensing a product resulting from mixing at least two liquid substances that react with each other upon contact to create gas and to thereby create a pressure that would cause a gas backflow pressure capable of causing damage to a portion of said device, said device comprising: (a) an elongated sheath forming an essentially closed mixing and reaction chamber; (b) a dispensing orifice located at an end of said sheath for dispensing said product; (c) a check valve in essentially sealed relationship within said sheath, being secured to said sheath, and located at an end of said sheath opposite to said dispensing orifice for preventing backflow of said gas, said check valve having at least two admitting openings to admit said liquid substances from a feeding system, an open interior portion for passing said substances through said check valve, and at least one exit opening to permit said substances to pass into said chamber, said check valve further comprising a closing element to close said exit opening upon creation of backflow pressure within said chamber thereby preventing damage to said feeding system, said closing element comprising a rod having a shaft and closing end, said rod axially moved due to pressure created within said check valve whereby said closing end is being moved to close said check valve against back pressure created within said mixing and reaction chamber; (d) a static mixer for mixing said substances and located within said chamber between said dispensing orifice and said check valve; and (e) a feeding system connected to said check valve for feeding said substances into said check valve.