LIQUID DISPENSING SYSTEM WITH INTERNAL RECIRCULATION

    公开(公告)号:WO2023081022A1

    公开(公告)日:2023-05-11

    申请号:PCT/US2022/047360

    申请日:2022-10-21

    Abstract: An electrostatic spray nozzle assembly (16) having fluid delivery and return tubes (36, 60) coupled to a common fluid supply. A piston assembly (50) having a shut off head (50b) is moveable between (1) a retracted position that permits fluid flow from the fluid supply through the delivery tube (36) for discharge from a spray tip discharge orifice (38c) while blocking the communication of fluid through the fluid return tube (60) and (2) an extended position that blocks the fluid flow to the spray tip discharge orifice (38c) while directing fluid to the return tube (60) for recirculation in said fluid supply (21). An atomizing gas directing tube (31) is supported in surrounding relation to the fluid delivery tube (36), and the fluid delivery and return tubes (36, 60) and other internal flow directing components of the spray nozzle assembly are electrically charged in relation for enhanced electrostatic spraying.

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