Dionex As - Replacing the Prep Syringe Valve

5•Service
Doc. 065051-03 1/08 167
5.14 Replacing the Prep Syringe Valve
1. Disconnect the liquid lines from the existing valve.
2. Remove the existing valve (see Section 5.12
).
3. When the valve is
removed, the syringe
drive shaft is visible.
When the syringe is in
the initial position (the
position selected when
the valve was
removed), the slot in
the drive shaft should
be in the 11 o’clock
position (see
Figure 5-34
).
Figure 5-34. Prep Syringe Drive Shaft
Initial Position
If the slot in the drive shaft is not in this position, the syringe drive may need
replacing. Contact Dionex for assistance. Do not attempt to manually turn the
drive shaft.
4. Check the back of
the new prep
syringe valve
(P/N 054243).
The valve drive
shaft should be
perpendicular to
valve ports N and
D (see
Figure 5-35
).
Figure 5-35. Prep Syringe Valve Drive Shaft
Initial Position (Back View)
If it is not, rotate the valve rotor until the drive shaft is in the correct position.
To check the position, insert the end of a paper clip into valve port N. If the
drive shaft is in the correct position, you will be able to insert the paper clip
Prep Syringe
Drive Shaft
(Initial Position
)
Drive Shaft
(Initial Position)
Port N
Port D
Back View o
f
Valve
(On top of valve.
Not visible in drawin
g
.
)
(On bottom of valve.
Not visible in drawing.)