GEM 613 - Fault Clearance; 20 Troubleshooting;

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613, 618
20 Troubleshooting / Fault clearance
Fault Possible cause Fault clearance
Working medium escapes
from leak detection hole*
Valve diaphragm faulty
Check valve diaphragm for damage,
replace diaphragm if necessary
Valve doesn't open or doesn't
open fully
Valve diaphragm incorrectly mounted
Remove actuator, check diaphragm
mounting, replace if necessary
Actuator faulty Replace actuator
Voltage is not connected Connect voltage
Incorrect assembly
Check assembly and wiring of the
electrical connection
Valve leaks downstream
(doesn't close or doesn't close
fully)
Operating pressure too high
Operate valve with operating pressure
specifi ed in data sheet
Foreign matter between valve
diaphragm and valve body weir
Remove actuator, remove foreign
matter, check valve diaphragm and
valve body weir for damage and replace
if necessary
Valve body weir leaking or damaged
Check valve body weir for damage,
if necessary replace valve body
Actuator faulty Replace actuator
Voltage is not connected Connect voltage
Incorrect assembly
Check assembly and wiring of the
electrical connection
Valve diaphragm faulty
Check valve diaphragm for damage,
replace diaphragm if necessary
Valve leaks between actuator
and valve body
Valve diaphragm incorrectly mounted
Remove actuator, check diaphragm
mounting, replace if necessary
Bolting between valve body and
actuator loose
Retighten bolting between valve body
and actuator
Valve diaphragm faulty
Check valve diaphragm for damage,
replace diaphragm if necessary
Valve body / actuator damaged Replace valve body / actuator
Valve body connection to
piping leaks
Incorrect installation
Check installation of valve body in
piping
Threaded connections loose Tighten threaded connections
Sealing material faulty Replace sealing material
Valve body leaks
Valve body faulty
GEMÜ 618: valve body corroded
Check valve body for damage, replace
valve body if necessary
* see chapter 21 "Sectional drawings and spare parts"