ARI Armaturen PREDU 700 EN - Manual (Page 16)

Page 2-16 Rev. 0040701000 1714
Operating and installation instructions
PREDU
®
Leakage too high when
valve is closed. Sealing surfaces of seat/plug eroded or
worn. Change valve or, if necessary,
seat/plug.
Sealing edge of seating damages or
worn. Change valve or, if necessary, seat/
plug, fit strainer if necessary.
Seat/plug leaking due to dirt. Clean internals of valve, fit strainer
if necessary.
Change valve or, if necessary,
seat/plug.
Unsafe rise in downstream
pressure. Safety valve not present in downstream
pressure system.
Fit safety valve.
Safety valve too small / wrong size. Reset safety valve and replace
if necessary.
Fault Possible cause Corrective measures