Solvent dosing for a spray applicator

A sprayer apparatus comprising:

• a sprayer body;
• a mix chamber supported by the sprayer body, the mix chamber including a first inlet bore, a second inlet bore, and a mixing bore;
• a first material pathway extending through the sprayer body to the first inlet bore;
• a second material pathway extending through the sprayer body to the second inlet bore;
• a purge air pathway extending through the sprayer body, the purge air pathway comprising:
• a common passage configured to receive a supply of compressed air;
• a first passage extending from the common passage to the first inlet bore of the mix chamber, the first passage configured to provide a first portion of the compressed air to the mix chamber through the first inlet bore;
• and
• a second passage extending from the common passage to the second inlet bore of the mix chamber, the second passage configured to provide a second portion of the compressed air to the mix chamber through the second inlet bore;
• a solvent pathway formed in the sprayer body, the solvent pathway extending from a solvent reservoir to a holding chamber;
• and
• a dosing rod supported by the sprayer body, wherein the dosing rod is configured to provide a dose volume of the solvent to a dosing chamber from the holding chamber;
• wherein the second passage extends through the dosing chamber at a location downstream of an intersection between the common passage, the first passage, and the second passage.

A method of spraying, the method comprising:

• placing a spray applicator in a spray mode, wherein a spray valve of the spray applicator fluidly connects a first material pathway with a mix chamber and fluidly connects a second material pathway with the mix chamber with the spray applicator in the spray mode;
• emitting, by the spray applicator, a plural component material formed within the mix chamber by a first base component material provided to the mix chamber by the first material pathway and a second base component material provided to the mix chamber by the second material pathway;
• shifting the spray valve from a first position associated with the spray mode to a second position associated with a purge mode;
• flowing, with the spray applicator in the purge mode, a first portion of purge air to the mix chamber through a first purge air pathway and a second portion of purge air to the mix chamber through a second purge air pathway;
• and
• entraining a dose volume of solvent within the second portion of purge air at a location upstream of the mix chamber and downstream of an intersection where the first purge air pathway splits from the second purge air pathway, such that the dose volume of solvent is provided to the mix chamber through only the second purge air pathway.