Knauer Smartline Pump 1000 Handbuch Seite 42

Simple Maintenance
SOP 32
SOP 33
Fig. 32
Replacing check valves
Remove the connection from the pump head to the solvent reservoir.
1. Remove the bushing on the inlet side (item {3.5}). The lower check
valve (item {3.10}) can now be removed together with the bushing.
2. Remove the complete capillary connection (item {3.22}) between
the two pump chambers. Loosen the screw fittings by alternating
from one to the other, to avoid bending the capillary.
3. Remove the bushing from the outlet side (item {3.6} in Fig. 4on
page 8).
4. Remove the upper check valve (item {3.10}) using a pair of
tweezers.
Cleaning check valves
1. Place the check valve in a suitable cleaning solution. Use an
ultrasonic bath to clean the check valve. If malfunction persists,
use steps 2 to 5 of this SOP.
2. Using a razor blade or similar, remove the check valve seals
carefully from the housing.
3. Remove the individual components by gently tapping the housing
on the table.
The valve ball and seating are adjusted in pairs. An exchange of one
these parts leads to malfunction of the check valve. Therefore care
must be taken when cleaning more than one check valve
simultaneously so that the matched parts do not become
disordered.
4. Clean the individual parts. We recommend an ultrasonic bath.
5. Assemble the check valves in reverse order. Be sure to that the
glossy side of the seating is facing the valve ball, see Fig. 32 and
assemble the check valve properly. Wrong assembly can lead to
damage and leakage of the check valve.
flow direction
Check valve, single parts
outer view
housing
transparent
valve seal
seating
ball guide
valve ball
90° turned
41