How is the regulator closed when the adjusting screw is turned?

The regulator is closed when the adjusting screw is turned in a clockwise direction, which tightens it. This action reduces the flow of gas by creating a seal in the regulator mechanism.

When the adjusting screw is turned clockwise, it compresses internal components that control gas flow, effectively reducing the pressure and closing off the gas supply. This is particularly important for safety and proper operation in welding applications, as it prevents unintentional gas release.

The choice stated suggests turning the screw counterclockwise, which would normally loosen it and allow for gas flow rather than closing it off. Understanding the mechanics of regulators is essential for ensuring safe and effective welding practices.