Check pressure and valves
Step 7: Turn the pressure adjusting screw on the regulator counterclockwise until it turns freely.
Step 8: Slowly open the cylinder valve. One full turn is usually sufficient.
Step 9: Check the gas cylinder pressure gauge. A full cylinder has approx. 2200 psi except for acetylene, carbon dioxide or special gas mixtures.
Detailed Compressed Gas Cylinder & Regulator Use