iii
Hermetic Booster Booster is used to increase gas pressure. 620
Automatic Butterfly Valve
Automatic butterfly valves are typically used
to set the output of the system.
720
Manual Butterfly Valve
Manual butterfly valves are used to balance
the air or gas flow at each burner.
720
Adjustable Limiting
Orifice
Adjustable limiting orifices are used for fine
adjustment of gas flow.
728/730
Pressure Switch
A switch activated by rise or fall in pressure.
A manual reset version requires pushing a
button to transfer the contacts when the
pressure set point is satisfied.
840
Pressure Gauge A device to indicate pressure. 940
Check Valve
A check valve permits flow only in one
direction and is used to prevent back flow of
gas.
780
Strainer
A strainer traps sediment to prevent blockage
of sensitive components downstream.
Flexible Connector
Flexible connectors isolate components from
vibration, mechanical, and thermal stresses.
Heat Exchanger
Heat exchangers transfer heat from one
medium to another.
500
Pressure Taps Pressure taps measure static pressure.
Symbol Appearance Name Remarks
Bulletin/
Info Guide
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