Troubleshooting - GEM 675 Operating Instructions Manual

13 Troubleshooting

13 Troubleshooting
Error
Working medium escapes from leak de-
tection hole
The product doesn't open or doesn't open
fully
The product leaks downstream (doesn't
close or doesn't close fully)
The product leaks between actuator and
valve body
Valve body connection to piping leaks
Valve body leaks
Handwheel cannot be turned
GEMÜ 675
Possible cause
Diaphragm faulty
Actuator defective
Shut off diaphragm incorrectly mounted
Operating pressure too high
Foreign matter between shut off dia-
phragm and valve body weir
Valve body leaks or is damaged
Shut off diaphragm faulty
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 leaks or is corroded
Handwheel defective
Handwheel clamp locked
24 / 27
Troubleshooting
Check diaphragm for potential damage,
replace diaphragm if necessary
Replace the actuator
Remove actuator, check diaphragm
mounting, replace if necessary
Operate the product with operating pres-
sure specified in datasheet
Remove the actuator, remove foreign
matter, check diaphragm and valve body
weir for potential damage, replace actu-
ator if necessary
Check valve body for potential damage,
replace valve body if necessary
Check shut off diaphragm for potential
damage, replace diaphragm if necessary
Remove actuator, check diaphragm
mounting, replace if necessary
Retighten bolting between valve body and
actuator
Check shut off diaphragm for damage, re-
place diaphragm if necessary
Replace actuator/valve body
Check installation of valve body in piping
Tighten threaded connections / unions
Replace sealing material
Check valve body for damage, replace
valve body if necessary
Replace the handwheel
Unlock handwheel clamp
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