19
3M
TM
6889 Exhalation Valve Disk (Figure 30)
fig. 30
1.
Remove external drink tube from tab on exhalation valve cover, quick disconnect coupling from
retainer in exhalation valve cover and exhalation valve cover (see previous instructions for 3M FR-
M40-104 exhalation valve cover).
2.
Remove old exhalation valve by grasping the valve disk and pulling straight away from the facepiece.
Discard exhalation valve.
3.
To install the exhalation valve disk, center the stem of the new exhalation valve disk over the center hole
in the exhalation valve body.
4.
Press straight down on the exhalation valve disk until the shoulder of the stem slips through the hole
in the exhalation valve body and is fully engaged.
5.
Check that the exhalation valve disk lies flat and smooth and has continuous contact with the
exhalation valve body seat.
6.
Rotate the exhalation valve disk with your finger to make sure it is properly seated.
7.
Reinstall the exhalation valve cover by gently pulling the cover over the flanges at the top of the
exhalation valve housing, seating the cover in the grooves at the sides of the exhalation valve housing,
and, finally, by pulling the tab on the cover and stretching it gently over the bottom of the valve
housing–seating it completely.
8.
Install the drink tube quick disconnect coupling securely in the retainer and fasten the external drink
tube to the drink tube retainer at the bottom of the exhalation valve cover.
Do not use mask assembly if inhalation valve body, inhalation valve disk or exhalation valve disk are
missing. The mask assembly will leak and may result in sickness or death.
3M™ FR-M40-106 Internal Drink Tube (Figure 31)
fig. 31
