Arena Service Manual
14.4 POST BLOOD LEAK DETECTOR FLOW RESTRICTOR
Refer to Figure 14-3 for the physical location, and to Figure 14-5
for the location in the fluid path.
This is a flow restrictor or false check valve. A flow restrictor is
externally the same as a true check valve. The difference is inside
the valve. A flow restrictor has a hole in the center of the valve
which allows a free flow in the direction indicated by the arrow on
the body of the restrictor, and a flow restriction in the opposite
direction.
This flow restrictor does not in any way affect the operation of the
BLD; however, it is covered in this section due to the close
connection to the BLD.
This flow restriction ensures that there is always positive pressure
on one side of the output pressure equalizer. Notice that
Instruments with the OLHDF option will have a flow restrictor
with a 5 (PSI) label on the body, and should be replaced by the
same kind of flow restrictor. If there is no number on the body,
then it is a 3 PSI valve (used for non-OLHDF instruments).
14-8 157-1278-921 Rev A
April 2004
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