System Components
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9 System Components
9.1 Box Flow
The general box flow is described below. When circulation is on, gas is drawn by the blower
from the box, through the column, and then back into the box. When the box requires a more
positive pressure, valve ‘GA’ opens enabling working gas to enter the circulation loop prior to
the column. This allows the gas to be purified before entering the box. When the box requires
less pressure, valve ‘VA’ opens enabling the gas from the box to be drawn out by the vacuum
pump. The remaining valves are for system regeneration purposes.
Figure 61 General Box Flow
9.1.1 Piping and Valves
All piping and tubing is stainless steel unless otherwise specified. All electromagnetic valves are
stainless steel with brass bases unless otherwise specified. All electro pneumatic valves are
stainless steel unless otherwise specified.
9.1.2 Column
The column contains the material that purifies the box gas, a heater for regeneration purposes,
and a set of either manual or automatic valves that switch on or off the circulation of the box
through the column. Construction is of stainless steel.
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