Low pressure plural component foam spray system

A low-pressure system for applying plural foam components to a surface comprising:

• a. a materials supply source comprising each of:
• i. a first non-pressurized container comprising a part A material;
• and
• ii. a second non-pressurized container comprising a part B material;
• b. a volumetric metering device in independent fluid communication with each of the first and second non-pressurized containers, wherein the volumetric metering device comprises each of:
• i. a pump configured to convey each of a part A material stream and a part B material stream in metered amounts from the first and second non-pressurized containers;
• and
• ii. a pre-heater configured to heat each of the part A and part B materials streams;
• c. a heated hose in fluid communication with the volumetric metering device, the heated hose configured to convey each of the part A and part B materials streams in respective part A and part B materials conduits to a hand held applicator;
• d. an air source;
• and
• e. the hand held applicator comprising:
• i. a support barrel having an end configured with a mixing nozzle mounting collar;
• ii. a pair of fluid conduits for conveying each of the part A and part B materials streams into a mixing nozzle engaged with the mixing nozzle mounting collar, wherein each of the part A and part B materials streams are conveyed into the mixing nozzle from their respective fluid conduits;
• iii. a gas conduit for providing gas to the mixing nozzle when the part A and part B materials streams are each flowing into the mixing nozzle;
• and
• iv. a fluid volume control trigger mounted to the support barrel for opening and closing of each of the part A and part B materials streams fluid conduits to start and stop flow of the part A and part B materials streams into the mixing nozzle,
• wherein the system is configured to mix the metered amounts of part A and part B materials streams conveyed from the respective part A and part B materials conduits into the mixing nozzle with air conveyed from the gas conduit, wherein the mixing occurs in both an intermediate space located at ends of the fluid conduits and in an interior cavity of the mixing nozzle, and wherein the mixing occurs at a pressure of 300 pounds per square inch or less when the volumetric metering device is operational to cause each of the part A and part B materials streams to flow from the heated hose part A and part B materials conduits into the hand held applicator for dispensing of the mixed part A and part B materials streams to a surface via an exit spout on an end of the mixing nozzle.