Valve default positions
When the system is powered up and connected to compressed air, the default positions
for the various valves are given in the table below. If no control signal is present, for ex-
ample if the mains power is shut off, the valves will revert to Closed positions.
Default positionValves
ClosedInlet valves
ClosedOutlet valves
ClosedSample inlet valves
ClosedCIP/AxiChrom column packing valves
InlineAir trap valves
BypassFilter valves
Bypass_BothColumn valves
Inlet valves should always be closed when not in use. This is essential to ensure
gradient accuracy and to prevent buffers from mixing.
Note:
Air trap valves
The air trap valve blocks are directly connected, either to the optional filter valve blocks
or to tubing going to the pre-column air sensor, in order to minimize the dead volume
that is caused by connecting valve blocks with tubing.
The layout of the air trap valves is illustrated below.
62 ÄKTAprocess Operating Instructions 29-0252-49 AA
3 System description
3.3 Standard components
3.3.7 Valves
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