750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
1-7
1.4 — Steam Controls (All Fuels)
1.4.6 — Water Column Drain Valve
Provided so that the water column and its piping can be flushed regularly to assist in maintaining cross-connecting
piping and in keeping the float bowl clean and free of sediment. A similar drain valve is furnished with auxiliary
low-water cutoff for the same purpose.
1.4.7 — Water Gauge Glass Drain Valve
Provided to flush the gauge glass.
FIGURE 1-4. Water Column Assembly & LWCO
1.4.8 — Vent Valve
Allows the boiler to be vented during filling, and facilitates routine boiler inspection as required by ASME Code.
1.4.9 — Stack Temperature gauge
Indicates flue gas outlet temperature.
1.4.10 — Auxiliary Low-Water Cutoff
Breaks the circuit to stop burner operation in the event boiler water drops below the master low-water cutoff point.
Manual reset type requires manual resetting in order to start the burner after a low-water condition.
1.4.11 — Safety Valve(s)
Prevents buildup over the design pressure of the pressure vessel. The size, rating, and number of valves on a boiler
is determined by the ASME Boiler Code. The safety valve and the discharge piping are to be installed to conform
to the ASME Code requirements. The installation of a valve is of primary importance to its service life. A valve
must be mounted in a vertical position so that discharge piping and code required drains can be properly piped to
CB LEVEL MASTER
(HIGH PRESSURE STEAM)
LOW PRESSURE STEAM
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