Systems, components, and methods for low pressure delivery of plural component systems such as polyurethane foams from unpressurized supply sources

A system for delivering a plural-component spray foam mixture to a surface at a pressure of about 250 pounds per square inch (psi) or less comprising:

• a. a part A material supply conduit;
• b. a part B material supply conduit;
• c. a fluid handling system comprising one or more pumps;
• d. an air delivery system comprising an air delivery conduit, the air delivery system configured to deliver air to a distal end of the delivery conduit;
• and
• e. a controller comprising at least one processor in communication with the fluid handling system, the controller configured to manage delivery of a part A materials stream and a part B material streams through the respective part A and part B material supply conduits in response to instructions configured to generate spray foam material in metered amounts of part A material and part B material;
• wherein, in use:
• i. the part A and part B material supply conduits are each, independently, in fluid communication with a spray foam applicator engaged at a distal end of each of the part A and part B material supply conduits, wherein the spray foam applicator is configured with a user-activated trigger;
• ii. the air delivery conduit is:
• a) in fluid communication with the spray foam applicator independently of each of the part A and part B material supply conduits;
• and
• b) configured to deliver the air into a forward end of the spray foam applicator when the air delivery system is in an on position;
• and
• iii. when the spray foam applicator trigger is actuated by a user, a mixing nozzle is engaged with a distal end of the spray foam applicator, and the air stream is flowing through the air delivery conduit, each of the part A and part B material streams and the air stream are communicated into the proximate end of the mixing nozzle via separate conduits for mixing along a length of the nozzle for delivery of a spray foam mixture from a distal end of the nozzle to a surface at pressure of about 250 psi or less.