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Symbol Appearance Name Remarks
Bulletin/
Info Guide
Gas Cock
Gas cocks are used to manually shut off the
gas supply.
710
Ratio Regulator
A ratio regulator is used to control the air/gas
ratio. The ratio regulator is a sealed unit that
adjusts the gas pressure in ratio with the air
pressure. To do this, it measures the air
pressure with a pressure sensing line, the
impulse line. This impulse line is connected
between the top of the ratio regulator and the
burner body.
742
Main Gas Shut-Off Valve
Train
Eclipse strongly endorses NFPA as a
minimum.
790/791
Pilot Gas Valve Train
Eclipse strongly endorses NFPA as a
minimum.
790/791
Automatic Shut-Off
Valve
Shut-off valves are used to automatically shut
off the gas supply on a gas system or a
burner.
760
Orifice Meter Orifice meters are used to measure flow. 930
Combustion Air Blower
The combustion air blower provides the
combustion air to the burner(s).
610
Main Gas
Shut-Off
Valve
Train
Pilot Gas
Shut-Off
Valve Train
System Schematics
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