Troubleshooting - GEM R677 Operating Instructions Manual

14 Troubleshooting

14 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 R677
Possible cause
Shut-off diaphragm incorrectly mounted
Actuator defective
Operating pressure too high
Foreign matter between shut-off dia-
phragm and valve body
Shut off diaphragm faulty
Valve body leaking or damaged
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
58 / 64
Troubleshooting
Remove the actuator, check the dia-
phragm mounting, replace the shut-off
diaphragm if necessary
Replace the actuator
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 damaged
parts if necessary
Check shut off diaphragm for potential
damage, replace the shut off diaphragm
if necessary
Check valve body for potential damage,
replace valve body if necessary
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
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