QM-Nr: FB_BMA_01-R-0804engl_3
Erstellt/
Prepared
: am/
on:19/11/2015
Genehmigt/
Approved: am
/
on19/11/2015
15 / 16
by ROFI S.A.R.L.
7. Troubleshooting table
Fault
Possible cause
Corrective measures
No flow
Flange covers have not been removed
Remove flange covers
Flow too low
Piping clogged
Check piping system
Flange broken between unit
and piping
Bolts tighten unevenly
Mating flanges not properly aligned
Re-align piping and fit new valve.
Relief the pressure in the system first !
Leaks across the gate
Solid particles in the medium
Deformation of the seat faces due to
excessive tightening of the valve or due
to thermal stress
Erosion or corrosion caused for instance
by incorrect selection of valve size or
material
Re-grind seats, use spare parts
only
by qualified personnel !
Leaks through Bonnet and
Flange
Extreme temperature fluctuation or
vibration
Excessive pressure stresses on the
Bonnet Flange bolting
Inadequate maintenance
External influences
Failure of seal as result of insufficient
resistance to temperature or medium
Re-tightening of connection bolts
Replacement of the seal
Leaks through gland
Inadequate maintenance
Wear of packing material
Failure of gland caused by the use of a
packing material without sufficient
resistance to temperature of the medium.
Retighten, repack or replace packing
Failure of actuators
Please see and check the manual of the
manufacturer
For causes of trouble and remedial action, refer
to the manual supplied by the actuator
manufacturer. We strongly recommend that limit
switches or torque limiters are reset by properly
skilled personnel only.