Which device on equipment prevents the backflow of gas toward the cylinder?

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Multiple Choice

Which device on equipment prevents the backflow of gas toward the cylinder?

Explanation:
Backflow prevention is a safety feature in oxy-fuel systems, stopping flame or gas from traveling back toward the cylinder. The device that does this is the flash arrestor. It quenches or interrupts any flame front trying to move back toward the gas source, often using a porous element or check-valve design to allow forward flow but block reverse flow. That targeting of reverse flame travel is why it’s the correct choice here. The welding torch is just the tool, not a backflow safeguard; a striker is only used to ignite the fuel gas, and a number like 244 isn’t a device for preventing backflow.

Backflow prevention is a safety feature in oxy-fuel systems, stopping flame or gas from traveling back toward the cylinder. The device that does this is the flash arrestor. It quenches or interrupts any flame front trying to move back toward the gas source, often using a porous element or check-valve design to allow forward flow but block reverse flow. That targeting of reverse flame travel is why it’s the correct choice here. The welding torch is just the tool, not a backflow safeguard; a striker is only used to ignite the fuel gas, and a number like 244 isn’t a device for preventing backflow.

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