ActionStep
Unscrew the purge valve by turning it counter-clockwise, and lift off the
metal ring.
2
Unscrew the plastic nut of the upper check valve using an adjustable wrench,
and gently lift off the upper check valve.
3
Replace the upper check valve with a new one.4
Tighten the nut until fully finger-tight and then use the adjustable wrench
to tighten a further 180 degrees.
5
Place the new metal ring onto the new upper check valve, and screw the
new purge valve.
6
350 ÄKTA avant User Manual 29035184 AE
7 Maintenance
7.8 Replacement procedures
7.8.8 Replace pump head check valves
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