When finished using oxyacetylene equipment, which is the proper shutdown action?

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The main idea is to stop gas flow at the source and relieve any remaining pressure in the system. Closing the cylinder valves immediately cuts off the supply of both oxygen and acetylene, which is the safest first step. Then backing the regulator adjustment screws out completely relieves the pressure from the regulators, ensuring no residual gas remains in the regulator bodies or hoses. This is especially important with acetylene, which can be hazardous if left under pressure. By removing pressure from both the cylinders and the regulators, you reduce the risk of leaks, regulator damage, or accidental ignition. The other shutdown options leave some portion of the system pressurized or continue gas flow, which is why they’re not the best practice.