32-00069—01
Ratio Regulator
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 the air supply line.
The cap must stay on the ratio regulator after
adjustment.
742
CRS Valve
A CRS valve is used in a high/low time-
proportional control system to quickly open
and close the air supply.
744
Pressure Taps
Pressure taps measure static pressure.
The schematics show the advised positions
of the pressure taps.
Impulse Line
The impulse line connects the ratios regulator
to the air supply line.
Symbol
Appearance
Name
Remarks
Bulletin/
Info Guide
iii