Which device is used to regulate gas flow from the cylinder to the welding area?

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

Answer: (C)

Regulators are used to bring the cylinder’s high pressure down to a safe, usable level and to keep that pressure steady as you weld. They attach to the cylinder and have an adjustable control that sets the desired outlet pressure, with gauges showing both the cylinder pressure and the regulated output. Once pressure is reduced, the gas travels through hoses to the welding area. A needle valve can fine-tune flow at the torch, but it doesn’t set the working pressure by itself. A manifold system distributes gas to multiple lines and may include regulators, but it isn’t the device that directly controls flow from the cylinder to the welding area. An adjusting screw alone isn’t a complete regulation device.