Patent ID: 8491227

Claim:
A method of pumping powder coating material in a powder coating system by a pump that is connected between a powder coating material supply and a powder coating spray gun, the pump comprising chambers A and B, wherein powder is drawn into the chambers A and B alternately during a respective suction cycle for each of the chambers A and B, and pushed out of the chambers A and B alternately during a respective delivery cycle for each of the chambers A and B, wherein during each suction cycle is a suction duration time during which suction is applied to the chambers A and B, the method comprising the steps of using an air flow rate controller to control the flow rate of air used to push powder out of chambers A and B during the delivery cycle and storing powder flow recipes in a data structure, each powder flow recipe producing desired powder flow characteristics from the pump, each powder flow recipe comprising one or more of the following parameters: the duration during which powder is drawn into the chambers A and B respectively, the suction duration time that suction is applied to the chambers A and B, the air flow rate for pushing powder out of the chambers A and B to the powder coating spray gun.