Dislodging A Stick Valve Ball - BRAND Titrette 4760141 Operating Manual

6. Cleaning/replacing the filling valve
b.
c.
d.
e.

12.3 Dislodging a stick valve ball

997469
a.
Remove the rear housing shell and take out the assem-
bly tool.
b.
Pull out the telescopic filling tube and the recirculation
tube.
c.
Use the assembly tool to unscrew the filling valve.
d.
If the sealing ring is contaminated or damaged, care-
fully remove it using a pair of angled tweezers.
e.
Clean the filling valve and sealing ring (ultrasonic bath)
or replace them.
f.
Insert the cleaned or new sealing ring, if necessary.
g.
Screw in the filling valve first by hand and then tighten
it with the assembly tool (1/4 turn is sufficient!).
If the instrument does not fill up, and if some elastic resis-
tance is evident when the piston is pulled upward, then it is
possible that the valve ball is stuck.
In this case, dislodge the valve ball using light pressure; for
example, with a 200 µl plastic pipette tip.
12 Cleaning
75
Operating manual