GE AKTA avant User Manual page 350

7 Maintenance
7.8 Replacement procedures
7.8.8 Replace pump head check valves
Step
2
3
4
5
6
350
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.
Replace the upper check valve with a new one.
Tighten the nut until fully finger-tight and then use the adjustable wrench
to tighten a further 180 degrees.
Place the new metal ring onto the new upper check valve, and screw the
new purge valve.
ÄKTA avant User Manual 29035184 AE