Maintenance and Care
37
P 2.1S/P 4.1S user manual V6870, version 3.1
Removing the Check Valves
The pump head is equipped with two check valves.
Prerequisite:
The pump head has been purged.
The capillary and tubing have been removed.
The pump head has been removed.
Tools:
Open-end wrench, size 13
Next steps:
Clean the check valves.
Cleaning the Check Valves
1. Fill a beaker with solvent.
2. Place the valve in the beaker.
3. Put the beaker in an ultrasonic bath for at least 10 minutes.
Fig. 24
Check valve
Process
Figure
1. Unscrew and remove the capillary
connector
1
.
2. Loosen the outlet fitting
2
with
the open-end wrench.
3. Remove the first check valve.
4. Loosen the inlet fitting
3
with the
open-end wrench.
5. Remove the second check valve.
Fig. 25
Check valve in pump head
2
3
1
