Patent ID: 8353469

Claim:
A powder spray system, comprising: a powder spray gun having a gun housing and a spray nozzle that can be mounted on the powder spray gun housing, a supply of powder coating material and a pump, the pump comprising a pump chamber, an inlet valve and an outlet valve to control flow of powder into and out of the pump chamber, the pump drawing powder from the supply into the pump chamber when the inlet valve is open and the outlet valve is closed, and pushing the powder out of the pump chamber to the spray gun when the outlet valve is open and the inlet valve is closed, the spray nozzle having a powder inlet, an outlet through which powder exits as a spray pattern and a powder flow path between the powder inlet and the outlet, an air inlet being provided to supply pressurized air to the spray nozzle, the pressurized air being supplied to the air inlet through one or more air channels in the spray gun housing, and a filter disposed within said nozzle through which air from said air inlet flows to be added to the powder before the powder exits the nozzle outlet, wherein the filter comprises a surface that forms at least part of the powder flow path.