Hawle HAWIDO 1405, Manual

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C. Fault finding
Symptoms Possible cause Action
Valve does not open One-way flow restrictor blocked Replace or unscrew the set
screw several times until the
valve functions properly
One-way flow restrictor closed
too far Loosen the grub screw until the
valve functions properly
Valve does not close One-way flow restrictor blocked Replace or screw the grub set
fully in and out several times,
and then reset
Filter in control circuit blocked Clean the filter
Air in the control lines or valve
chamber Vent system
Foreign matter in the main valve Carry out a service, and remove
any foreign matter
Diaphragm defective Carry out a service, and replace
the diaphragm
Valve spindle jammed by
encrustation Carry out service, and remove
any encrustation
Loud noises Unsatisfactory operational
conditions Change pressure conditions by
0.1 to 0.2 bar. Slightly open or
close the one-way flow
restrictor. Contact Hawle
customer service department.
Wrong valve diameter Calculate correct valve
diameter. (If necessary contact
Hawle)
Erratic operation One-way flow restrictor
incorrectly set Reset (according to Chapter:
Resetting the reaction speed)
Original pressure values no
longer reached Pressure gauge faulty Check or replace pressure
gauge
Changed operating conditions Reset accordingly (see Chapter:
Recommended installation)
Epoxy-coating damaged Transportation damage,
installation damage Repair using Hawle two-
component repair kit for
coatings