Flow Rate Curves - Pepperl+Fuchs Bebco EPS 5500 Series User Manual

5500 S M  P
erieS anual
2.4.2

Flow Rate Curves

The enclosure pressure vs. flow rate curves below represent the EPV-5500....-01, 02,
and 03 vents. This corresponds to the enclosure pressure and is independent of the
valve used, provided the valve can deliver the flow rate that is required.
The curves below represent completely sealed enclosure, which may not be
representative of the customer's enclosure. More flow may be required to reach the
enclosure pressure in the enclosure due to leakages from gaskets, seals, windows,
etc.
The EPV-5500-...-01 is best suited for large enclosures because it has a higher flow
rate and lower back pressure within the enclosure than the other versions. This can
reduce the purging time while keeping the enclosure pressure low, which is important
for a large enclosure. However, this vent leaks more pressure through its flow control
mechanism.
The EPV-5500-...-02 provides a better seal at the vent than the EPV-5500-...-01. The
flow rate for purging is less for the same enclosure pressure of the '-01' version.
The EPV-5500-...-03 provides the best seal for pressurization and should be
selected for a smaller enclosure, bottled air, or inert gas sources, and for increased
conservation of the protective gas source. The flow rate is less than the '-01' and '-02'
versions but provides very low leakage.
There is no restriction on the enclosure size for each vent, but leakage rate, flow rate,
and enclosure pressure should be considered when applying these vents and the
purge time 166 min.
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