Tweco Single & Two Stage Regulators - Manual (Page 17)

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WARNING
DO NOT attach or use the regulator if oil, grease, flamma ble
substances or damage is present! Have a qualified repair
technician clean the regulator or repair any damage.
Figure 6: Regulator to Cylinder Valve
7. Before opening the cylinder valve, turn the regulator adjusting
knob counterclockwise until there is no pressure on the
adjusting spring and the knob turns freely.
8. Relief Valve (where provided): The relief valve is designed to
protect the low pressure side of the regulator from high pres-
sures. Relief valves are not intended to protect down stream
equipment from high pressures.
WARNING
DO NOT tamper with the relief valve or remove it from the
regulator.
WARNING
Stand to the side of the cylinder opposite the regulator when
opening the cylinder valve. Keep the cylinder valve between
you and the regulator. For your safety, NEVER STAND IN
FRONT OF OR BEHIND A REGULATOR WHEN OPENING
THE CYLINDER VALVE!