Patent ID: 7703705
Filing Date: 2010-04-27
Classification: B05B,B29B,B29C

Abstract:
1. An apparatus for dispensing a mixture of a pressurized gas and a fluid material, the apparatus comprising: a mixing device including a mixing chamber confining a stream of the fluid material and a mixer inside said mixing chamber, said mixer configured to combine the pressurized gas with the stream of the fluid material to form the mixture; a dispenser coupled in fluid communication with said mixing chamber, said dispenser configured to receive and dispense the mixture; and a gas injection device having a main body, a gas passage extending through said main body, an inlet to said gas passage that is configured to receive the pressurized gas, and a control orifice in said gas passage, a nozzle coupled with the main body and having an outlet coupling said gas passage in fluid communication with said mixing chamber of said mixing device, and a flow control element located in said gas passage between said inlet to said gas passage and said outlet from said nozzle, said control orifice configured to meter a flow rate of the pressurized gas to said outlet and into said mixing chamber, and said flow control element including a plunger, a seat between said inlet and said control orifice, and a biasing element applying a biasing force that urges said plunger into contact with said seat, said plunger movable relative to said seat to provide a first condition in which the pressurized gas can flow in said gas passage from said inlet through said control orifice to said outlet and a second condition in which the pressurized gas is blocked from flowing to said outlet.