GE AKTA avant Operating Instructions Manual page 174

7 Maintenance
7.5 Clean pump head check valves
Step
4
5
6
174
Action
Unscrew the purge valve by turning it counter-clockwise, and lift off the
metal ring.
Unscrew the plastic nut of the upper check valve using an adjustable wrench,
and gently lift off the upper check valve.
Unscrew the two white plastic screws located below each pump head. Pull
the plastic connectors to the sides to release the inlet manifold.
ÄKTA avant Operating Instructions 29101556 AB