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2. Add vapor to the battery system if the normal operating pressure
decreases and reaches a preset value
One should mention that, in addition to this vapor regulator, other auto-
matic relief valves are found in the VRU. The system works automatically
and in harmony. The breather valve operates if excessive pressure or vacuum
exists, whereas the manhole relief functions if abnormal pressure or vacuum
is experienced in the system. Values of pressure settings of the different
instruments in the system are illustrated in Figure 5.
Figure 5 Chart for pressure setting for the VRU. (After Chilingar and Beeson.)
Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved.
