Spray gun with adjustable atomizer and removable nozzle body

A spray gun assembly, comprising:

• a lance having:
• (i) an inlet for a liquid to be atomized;
• (ii) an inlet for an atomizing gas;
• (iii) an inlet for a heat-transfer fluid;
• (iv) an outlet for the heat-transfer fluid;
• a nozzle body removably attached to the lance, the nozzle body having an internal mixing chamber for receiving the liquid to be atomized and the atomizing gas, the nozzle body having a plurality of flow passages arranged for a flow of the atomizing gas from the lance into the internal mixing chamber;
• a spray nozzle tip removably affixed to a discharge end of the nozzle body, the spray nozzle tip having discharge orifices;
• the lance further comprising:
• (v) a liquid supply passage extending between the inlet for the liquid to be atomized and the nozzle body;
• (vi) an atomizing gas passage extending between the inlet for the atomizing gas and the flow passages in the nozzle body;
• and
• (vii) a heat-transfer fluid passage extending from the inlet for the heat-transfer fluid, through the lance concentric with the liquid supply passage and the atomizing gas passage, and to the outlet for the heat-transfer fluid;
• wherein the nozzle body is movable on the lance such that a flow area of the flow passages in the nozzle body is adjustable between a relatively larger flow area and a relatively smaller flow area.