Set other valve parameters
To set the parameters Hold backpressure and Boost in the PCV instruction settings,
follow the steps described below:
ActionStep
Set Hold backpressure to 0.5 bar over the buffer pressure.
Note:
The valve adjusts the pressure to the Inlet A Hold back tank pressure param-
eter, so it must not be set lower than the buffer pressure.
1
Set the Boost parameter to 5% or 6%.
Tip:
Boost, when added to the PCV signal, minimizes pressure spikes when the
pump starts. Although 5% or 6% is usually preferred, this should be adjusted
according to requirements.
2
PCV close limits
Pressure control valves must never be completely closed during a run.
The UNICORN control system will fully open the PCV when the system is in End mode.
When the system is in Run or Pause mode UNICORN will set the PCV to its Close_limit.
The Close_limit for the PCV must be entered in UNICORN according to the flow rate to
be used.
If the Close_limit is set to 0.0 the PCV will close completely. As the limit setting
depends on the flow rate used, however, it should be noted that a Close_limit
of 0.5 may also result in a closed PCV.
Note:
WARNING
Never operate ÄKTAprocess with pressure control valves (PCVs)
completely closed. A pressure increase may result, and cause
leakage.
122 ÄKTAprocess Operating Instructions 29-0252-49 AA
5 Operation
5.1 Prepare the system
5.1.4 Set pressure control valve parameters
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