Replacing The Valves - BRAND Dispensette TA Operating Manual

Dismantling instrument
2.
Replacing the filling valve
a) Pull out the recirculation tube and the telescoping filling tube
(Fig. 1).
b) Use the mounting tool to unscrew the filling valve (Fig. 2).
c) If the sealing ring is contaminated or damaged, carefully
remove it with a pair of curved forceps (Fig. 3).
d) Insert cleaned or new sealing ring.
e) Screw in the cleaned or new filling valve, first by hand, then
tighten it with the mounting tool.
3.
Replacing the discharge valve
The discharge valve is incorporated in the discharge tube.
Mount cleaned or new discharge tube see page 28.
4.
Replacing the SafetyPrime™ recirculation valve
Mount cleaned or new recirculation valve see page 28.
Note:
If the instrument does not fill up, and if some elastic resistance is
evident when the piston is pulled upward, then it is possible that the
ball valve is merely stuck.
In this case, loosen the ball valve using light pressure, for example,
with a 200 µl plastic pipette tip (see the figure at the side).
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