High blast torches use a small amount of high-pressure air to pick up incoming gas at the mixer, with 10% of the air passing through a primary venturi that inspirates the gas flow and elevates its pressure. The suction effect allows for low-capacity injectors, as 90% of the air is inspirated from outside. The high-pressure air valve and primary air shutter provide wide adjustment ranges, while the injector-type design of the high-pressure stage prevents air feedback into the gas line.