Troubleshooting / Fault Clearance - Gemü R690 Original Einbau- Und Montageanleitung

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Troubleshooting / Fault clearance

Fault
Control medium escapes
from vent hole* in the
actuator cover (for control
function NC) or from
connector 2 (see chapter
11.2 "Control functions" for
control function NO)
Control medium escapes
from leak detection hole*
Working medium escapes
from leak detection hole*
Control medium escapes
at the actuator membrane
Valve doesn't open or
doesn't open fully
Valve leaks downstream
(doesn't close or doesn't
close fully)
Valve leaks between
actuator and valve body
Valve body connection to
piping leaks
Valve body leaks
* see chapter 20 "Sectional drawing and spare parts"
Possible cause
Actuator membrane* faulty
Spindle seal leaking
Valve diaphragm faulty
Connecting bolts between actuator
cover and base are loose
Control pressure too low
(for control function NC)
Pilot valve faulty
Control medium not connected
Valve diaphragm incorrectly mounted
Actuator spring faulty
(for control function NO)
Operating pressure too high
Control pressure too low (for control
function NO and control function DA)
Foreign matter between valve
diaphragm and valve body weir
Valve body weir leaking or damaged
Valve diaphragm faulty
Actuator spring faulty
(for control function NC)
Valve diaphragm incorrectly mounted
Bolting between valve body and
actuator loose
Valve diaphragm faulty
Actuator / valve body damaged
Incorrect installation
Threaded connections / bolting loose
Sealing material faulty
Valve body faulty
Fault clearance
Replace actuator
Replace actuator and check control medium
for impurities
Check valve diaphragm for damage, replace
diaphragm if necessary
Retighten bolts professionally diagonally
Operate valve with control pressure specified
in data sheet
Check and replace pilot valve
Connect control medium
Remove actuator, check diaphragm mounting,
replace if necessary
Replace actuator
Operate valve with operating pressure
specified in data sheet
Operate valve with control pressure specified
in data sheet
Remove actuator, remove foreign matter,
check valve diaphragm and valve body weir for
damage and replace if necessary
Check valve body weir for damage,
if necessary replace valve body
Check valve diaphragm for damage, replace
diaphragm if necessary
Replace actuator
Remove actuator, check diaphragm mounting,
replace if necessary
Retighten bolting between valve body and
actuator
Check valve diaphragm for damage, replace
diaphragm if necessary
Replace actuator / valve body
Check installation of valve body in piping
Tighten threaded connections / bolting
Replace sealing material
Check valve body for damage, replace valve
body if necessary
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R690