Danfoss APP Series Installation, Operation And Maintenance Manual page 32

Operation guide
32 | 180R9346 | AQ240486503020en-001702
Installation, Operation and Maintenance APP 53-92 pumps
High pressure safety or relief valve:
i) As the Danfoss APP pump begins to create
pressure and flow immediately after
start-up and regardless of any counter
pressure, a safety or pressure relief valve (8)
should be installed after the non-return
valve to prevent system damage and to
avoid high pressure peaks.
Note: If a non-return valve is mounted in the inlet
line, a low-pressure relief valve is also required
between the non-return valve and
pump as protection against high-pressure peaks.
Media filter
PI
PI
Feed
Fresh water
permeat flush
PI PI
PT
PI
Permeate
PI
Brine
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