The part used to increase or decrease the gas pressure delivered to the torch from the regulator?

• A. Manifold system
• B. Regulator
• C. Adjusting screw
• D. Needle valve

Answer: (C)

The part that sets how much pressure comes out of the regulator is the adjusting screw. It tunes the regulator’s outlet pressure by changing the spring tension on the diaphragm inside the regulator. Turning the screw clockwise typically increases the outlet pressure, while turning it counterclockwise decreases it. This is the knob you use to dial in the right flame characteristics for the torch. The other components have different roles: the regulator reduces cylinder pressure to a usable level; the needle valve meters how fast gas flows to the flame; and the manifold system distributes gas to multiple lines.