Tweco Single & Two Stage Regulators - Manual (Page 18)

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9. Slowly and carefully open the cylinder valve (Figure 7) until the
maximum pressure shows on the high pressure gauge.
Figure 7: Open Cylinder Valve
10. On all cylinders, except acetylene, open the valve completely
to seal the valve packing. On gaugeless regulators, the indicator
will register the cylinder contents open.
11. On acetylene cylinders, open the valve 3/4 of a turn and no
more than 1-1/2.
WARNING
Acetylene delivery pressure must not exceed 15 PSIG
(103 kPa) or 30 PSIG (207 kPa). Acetylene can dissociate
(decompose with explosive violence) above these pressure
limits.
CAUTION
Keep the cylinder valve wrench, if one is required, on the
cylinder valve to turn off the cylinder quickly, if necessary.
12. Attach the desired downstream equipment.