Final answer:
To safely open a cylinder valve, ensure the regulator valve is closed and check that all relevant valves are sealed to prevent gas leakage.
Explanation:
Before opening a cylinder valve, be sure to:
- Be sure the regulator valve is closed by turning it counter-clockwise.
- Check that valves on the cylinder and hoses are closed to prevent gas leakage.
- Do not shake the cylinder; handle it carefully to ensure safety.
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