Patent ID: 7234649

Claim:
An apparatus for spraying liquid surface treatment material, the apparatus comprising: a body; a liquid inlet for supply of the liquid surface treatment material; a gas inlet for supply of pressurized gas to be mixed with the liquid surface treatment material; an outlet nozzle through which the gas and liquid surface treatment is sprayed; a control needle valve adapted to regulate the supply of the liquid surface treatment material to the outlet nozzle; a gas supply passageway adapted to supply gas from the gas inlet to the outlet nozzle; and a control means for controlling the control needle valve, the control means comprising a cap member received on the body and engaged with the control needle valve, the cap member being adapted so as to be adjustable in the axial direction relative to the body to limit axial movement of the control needle valve; wherein the cap member and body are each provided with a plurality of indicators which indicate the limit applied to the axial movement of the control needle valve, and wherein the apparatus is adapted such that the control means does not restrict gas flow in the gas supply passageway when limiting the axial movement of the control needle valve.