The Principle Behind Adjusting the Flame Hardness of a Screw-Type Torch

Controlling Gas Flow Rate:
Gas Valve Adjustment: Torch guns are typically equipped with a gas valve assembly. When the valve opening is widened, the flow rate of gas exiting the nozzle increases; after mixing with air, the gas burns more intensely and releases more heat, resulting in a "harder" flame-characterized by higher temperature, greater concentration, and stronger impact force. Conversely, when the valve opening is narrowed, the gas flow rate decreases; the flame burns less intensely and becomes "softer," exhibiting a relatively lower temperature and a more diffuse spread.
Gas Regulation Switch Control: Some torch guns feature a gas regulation switch located at the base. Through operations such as rotating or pressing, this switch controls the volume of gas entering the torch barrel. The wider the opening, the greater the gas intake, and the harder the flame; conversely, a smaller opening results in less gas intake and a softer flame.

Adjusting Air Mixture Volume:
Adjustment Port Size Control: The connecting rod on the head of some torch guns features adjustment ports on its side wall, accompanied by a corresponding adjustment mechanism. By manipulating this mechanism to alter the size of the adjustment ports, the volume of air entering the torch barrel is effectively controlled. When the adjustment ports are enlarged, increased airflow allows for thorough mixing with the gas, resulting in more complete and intense combustion-and thus a harder flame. Conversely, when the adjustment ports are narrowed, airflow is restricted; the gas cannot burn as completely, causing the flame to become softer.
Air Intake Shutter Adjustment: Certain torch guns are designed with air intake ports on the main barrel, paired with a flame adjustment switch that features its own corresponding vents. Rotating the flame adjustment switch to increase the alignment area between the switch vents and the barrel ports allows for greater airflow, resulting in a harder flame. Conversely, rotating the switch to partially or fully obstruct the barrel ports reduces airflow, causing the flame to become softer.