Patent ID: 6223997
Filing Date: 2001-05-01
Classification: B05B

Abstract:
Purging apparatus for a powder coating system of the type having a powder supply, a powder pump that receives powder from the powder supply through a suction pick-up tube, a spray gun and a powder hose that connects the pump to the gun, comprising:a purge air switch assembly;a first air source that provides air at purge pressure to a first inlet of said purge air switch assembly;a second air source that provides flow rate air to a first pump inlet and atomizing air to a second inlet of said purge air switch assembly;wherein powder is drawn up the tube and into the pump by suction produced by flow rate air into the pump; anda purge inlet associated with a powder inlet to the pump;the purge air switch assembly operating in response to a purge control signal to connect purge air to an atomizing inlet at the pump and to said purge inlet;whereby the pump, hose and gun can be purged at the same time.