15
Easy Maintenance
7.
Install the two „Connection capillaries“, Pos. {3.8}, beginning with the
lower „s“-shaped one, and firmly tighten all fittings.
SOP 8
Cleaning and Replacing Check Valves
This SOP refers to the following pump heads:
100 ml stainless steel, KNAUER order number A 4029-1
250 ml stainless steel, KNAUER order number A 4021-1
500 ml stainless steel, KNAUER order number A 4038-1
1000 ml stainless steel, KNAUER order number A 4022-1
If the check valves become dirty they will no longer open and close correctly.
You can remove the check valves for cleaning from the pump head after
loosening and removing the „Inlet valve housing“, Pos. {3.5} and „Outlet valve
housing“, Pos. {3.6}, and then disassemble them according to the following
instructions.
1.
Place the valves in a suitable cleaning solution. Use a ultrasonic bath to
clean the valve. If malfunction persists, use steps 2…5 of this SOP.
2.
Using a knife or similar, carefully remove the valve seal from the housing,
see Fig. 23 on page 41.
3.
Remove the valve ball out of the housing.
4.
Clean the individual parts. We recommend a ultrasonic bath.
5.
Assemble the check valves in reverse order, use Figure Fig. 14.
Housing
Valve seal
Valve ball
Fig. 14
Components of the check valves of all pump heads available
