4-16
SET-UP AND SAFE OPERATING PROCEDURES
0056-0114
WARNING
Always keep the regulator free of oil, grease and other flammable substances. Never use
oil or grease on the regulator, cylinder or manifold connection. Only use the regulator
for the gas and pressure for which it was designed. NEVER alter a regulator for use
with any other gas.
Inlet Connection
Regulators are attached to the cylinders or piping outlets by their “inlet connections.” Inlet connections
must have a clean filter. All inlet connections conform to specifications and standards set by the
Compressed Gas Association (CGA) and are marked with an identifying CGA number. CGA numbers
identify the cylinder valve and gas service for which that inlet connection is designed. Examples: CGA
510 has been designated for standard fuel gas cylinder connections such as acetylene, propylene/
propylene-based fuel gases, MAPP
®
and propane. CGA 540 connections are designated for oxygen
service only. Fuel gas inlet connections usually have left-hand threads. Those with left-hand threads
also have a “V” notch around the inlet nut to further designate the connection for fuel gas service.
All oxygen connections have right-hand threads.
Pressure Adjusting Screw
The regulator adjusting screw controls the delivery pressure of the gas to the hose. As previously
stated, the regulator’s function is to reduce high supply pressures to a suitable working pressure
range. When the adjusting screw is turned clockwise, the regulator allows gases to flow through the
regulator to the hoses and to the torch. The threaded adjusting screw applies mechanical force to a
spring and diaphragm which controls a pressure valve in the regulator. If the adjusting screw is turned
fully counterclockwise, tension on the spring is released and the regulator normally does not allow
the gas to flow. The regulator adjusting screw is not intended as a “shut off” mechanism.
Pressure Gauges
The inlet pressure gauge indicates the cylinder or supply pressure entering the regulator. The delivery
pressure gauge indicates the delivery pressure from the regulator to the hose. All gauges are precision
instruments; handle with care.
Outlet Connections
Gas hoses are attached to the regulator outlet connections. Most fuel gas regulators have left-hand
threaded outlet connections to mate with the left-hand hose connections and have a “V” notch around
the outlet connection to further designate the connection for fuel gas service. Oxygen regulators have
right-hand threaded outlet connections to mate with the right-hand hose connections.
Relief Valve (where provided)
Internal or external relief valves are designed to protect the low pressure side of the high pressure
regulator from damage due to an inadvertent high pressure surge.
WARNING
DO NOT tamper with the relief valve or remove it from the regulator. Relief valves are
not intended to protect downstream equipment from high pressures.
Oxy-fuel Apparatus
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