System for spraying powder

Claim 1

An improved system for spraying fluidized powder comprising a powder dispenser, a powder fluidization chamber including a hollow container adapted to contain a quantity of powder therein, means for sealing said chamber, means for introducing a stream of air into said chamber to fluidize the powder therein, a powder blower having an outlet from which a stream of air is allowed to pass, a powder control valve connected to said chamber and in communication with said fluidized powder therein, means for actuating said powder control valve wherein a quantity of fluidized powder is exhausted into an orifice in said powder control valve, means for introducing the exhausted fluidized powder from said powder control valve into the side of said outlet from said powder blower, a supply conduit connecting said outlet with a portion of said powder dispenser for supplying a stream of fluidized powder to said powder dispensing device, and a fluidization blower having its suction from the atmosphere and from which a stream of fluidizing air is allowed to pass into said chamber, said powder control valve comprising a powder valve body partially extending into said chamber, said powder valve body having a fixed valve seat internal of said chamber and being threadly received within a cylinder, said cylinder being external of said chamber and having a piston slidably received therein, a compression spring surrounding said cylinder and said piston, a cone-shaped poppet having its tapered end received into an orifice within said valve seat, and a horizontally disposed piston rod received on said poppet and extending through said powder valve body and being threadly received in said piston whereby said piston rod is adapted to extend into said chamber when the spring is compressed, thus unseating said poppet from the valve seat orifice thereby allowing a quantity of fluidized powder to be exhausted into the powder valve.