Knauer WellChrom HPLC Pump K-1001 Handbuch Seite 36

36
SOP 30 Cleaning check valves
Fig. 28
3. Remove the bushing from the outlet side {3.6}.
4. Remove the upper check valve {3.10} using a pair of tweezers.
1. Place the valve in a suitable cleaning solution. Use an ultrasonic bath to
clean the valve. If malfunction persists, use steps 2 to 5 of this SOP
2. Using a knife or a similar, remove the valves seals carefully from the
housing.
3. Remove the individual components by gently tapping the housing on the
table.
Valve ball and seating are adjusted in pairs. An exchange of these parts
leads to malfunction of the check valve. Therefore take care, that any
exchange will be avoided, when cleaning more than one check valves
simultaneously.
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. 28 and assemble the
check valve properly. Wrong assembly can lead to damage and leakage
of the check valve.
flow direction
Check valve, single parts
6. Put the check valves considering the flow direction into the bushing holes
3.5 and 3.6. Screw in the bushings by hand. Tighten the bushings
carefully with a spanner by about ½ - ¾ turns.
To avoid destruction of the ceramics tighten the screws of the ceramic
gasket holder (item {3.5} and {3.6}) with 8 Nm using a torque wrench.
outer view
housing
transparent
valve seal
seating (glossy side)
ball guide
valve ball
seating (lustreless side)
90° turned
Easy Maintenance