Troubleshooting - GEM 671 Operating Instructions Manual

13 Troubleshooting

13 Troubleshooting
Error
The product does not open or does not
open fully
The product is leaking downstream (does
not close or does not close fully)
The product is leaking between actuator
and valve body
Valve body connection to piping leaking
Valve body of the GEMÜ product is leak-
ing
Handwheel cannot be turned
GEMÜ 611/671
Error cause
Actuator defective
Shut-off diaphragm incorrectly mounted
GEMÜ 671: Grooved pin (anti-twist sys-
tem) not engaged
Operating pressure too high
Foreign matter between shut-off dia-
phragm and valve body
Valve body leaking or damaged
Shut off diaphragm faulty
GEMÜ 671: Grooved pin (anti-twist sys-
tem) not engaged
Shut off diaphragm incorrectly mounted
Bolting between valve body and actuator
loose
Shut off diaphragm faulty
Actuator/valve body damaged
Incorrect installation
Threaded connections / unions loose
Sealing material faulty
Valve body of the GEMÜ product is faulty
or corroded
Actuator defective
GEMÜ 671: Handwheel clamp locked
GEMÜ 671: Threaded spindle seized
34 / 41
Troubleshooting
Replace the actuator
Remove the actuator, check the dia-
phragm mounting, replace the shut-off
diaphragm if necessary
Remove the actuator, check the com-
pressor mounting (see chapter "General
information"), engage grooved pin (anti-
twist system)
Operate the product with operating pres-
sure specified in datasheet
Remove the actuator, remove foreign
matter, check diaphragm and valve body
for potential damage, replace actuator if
necessary
Check valve body for potential damage,
replace valve body if necessary
Check shut off diaphragm for potential
damage, replace the shut off diaphragm
if necessary
Remove the actuator, check the com-
pressor mounting (see chapter "General
information"), engage grooved pin (anti-
twist system)
Remove the actuator, check the dia-
phragm mounting, replace the shut off
diaphragm if necessary
Tighten bolting between valve body and
actuator
Check shut off diaphragm for potential
damage, replace the shut off diaphragm
if necessary
Replace actuator/valve body
Check installation of valve body in piping
Tighten threaded connections / unions
Replace sealing material
Check valve body of the GEMÜ product
for potential damage, replace valve body
if necessary
Replace the actuator
Unlock handwheel clamp
Dependent on the operating conditions,
regrease the threaded spindle; replace ac-
tuator if necessary.
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