Key To System Schematics - Eclipse RA Series Design Manual

K t s D
ey o ystem
Symbol Appearance
Main gas
shut-off
valve train
NC
16
rawings
Name
RatioAir
Main Gas Shut-
Off Valve Train
Gas Cock
Solenoid Valve
(normally closed)
Fuel Orifice Meter
Adjustable
Limiting Orifice
Pressure
Regulator
Ratio Regulator
Pressure Taps
Impulse Line
Remarks
Eclipse strongly endorses NFPA
as a minimum.
Gas cocks are used to manually
shut off the gas supply on both
sides of the main gas shut-off
valve train.
Solenoid valves are used to
automatically shut off the gas
supply on a bypass gas system or
on small capacity burners.
Fuel orifice meters are used to
measure gas flow.
Adjustable limiting orifices are
used for fine adjustment of gas
flow.
A pressure regulator reduces gas
pressure to a stable, usable
pressure.
A ratio regulator is used to control
the air/gas ratio. The ratio
regulator is a sealed unit that
adjusts the gas flow in ratio with
the air flow. 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 burner body.
Eclipse RatioAir v1 Design Guide No. 115, 11/12/2008
Bulletin /
Info Guide
756
710
760
910
684
742