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7 Adjusting Operating Pressures After making sure that the system is leak-tight, release the pressure-adjusting screws on both regulators, and open the torch valves. Then proceed as follows: With torch oxygen valve open, turn in the pressure-adjusting screw on the oxygen regulator until the desired working pressure is indicated on the regulator delivery-pressure gauge. Then close the torch oxygen valve. If you are adjusting pressure for a cutting torch, open only the torch cutting oxygen valve. If you are adjusting pressure for a cutting attachment, open the oxygen valve on the torch handle and the cutting oxygen valve (but not the preheat oxygen valve) on the cutting attachment. Avoid setting pressures higher than those recommended by the equipment manufacturer for the welding head or cutting nozzle installed in your torch. With the torch acetylene valve open not more than one full turn, turn in the pressure-adjusting screw on the acetylene regulator until the desired working pressure – NOT OVER 15 PSI (103 kPa) – is indicated on the regulator delivery-pressure gauge. Close the acetylene valve immediately. PRECAUTION: Never release acetylene, or any other fuel gas, near any possible source of ignition or into any space which is not adequately ventilated. If such conditions cannot be met, adjust pressure with the torch fuel gas valve closed. Readjust pressure, as necessary, after the torch has been lighted in accordance with the instructions which follow. If acetylene or other fuel gas is being supplied to the torch from a piping system which is not equipped with regulators at each station outlet, merely open the service valve at the station outlet. Do not open the torch fuel gas valve until you are ready to light the flame.