For cylinders equipped with a stem valve, the valve spindle key should remain on the stem while the cylinder is in service.After the regulator is attached, the cylinder valve should be slowly opened just enough to indicate pressure on the regulator gauge (no more than one full turn), and all the connections checked with a soap solution for leaks.Always use safety glasses (preferably a face shield) when handling and using compressed gases, especially when connecting and disconnecting compressed gas regulators and lines.Where the possibility of flow reversal exists, the cylinder discharge lines should be equipped with adequate check valves to prevent inadvertent contamination of the cylinder.Regulators are gas specific and not necessarily interchangeable. Never use an adapter between the outlet valve of a cylinder and the regulator.Orientate pressure relief devices so that it does not pose a hazard to personnel in the area when out-gassing.The threads on cylinder valves, regulators, and other fittings should be examined to ensure they correspond are clean and undamaged.Never reduce the residual pressure of a cylinder below the operating pressure of the system or 25 psi, whichever is higher. ![]() Standard cylinder-valve outlet connections have been devised by the Compressed Gas Association (CGA).
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