Troubleshooting - GEM 650 Special function J Operating Instructions Manual
Pneumatically operated diaphragm valve
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18 Troubleshooting
18 Troubleshooting
Error
Control medium escaping from a vent
hole in the actuator cover
Control medium escaping from leak de-
tection hole
Working medium escaping from leak de-
tection hole
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
Connection between valve body and pip-
ing leaking
Valve body leaking
GEMÜ 650 / 687 Special function
J
Error cause
Actuator membrane faulty
Spindle seal leaking
Shut off diaphragm faulty
Control pressure too low (for control
function NC)
Pilot valve faulty
Actuator defective
Control medium not connected
Shut-off diaphragm incorrectly mounted
Operating pressure too high
Foreign matter between shut-off dia-
phragm and valve body
Valve body leaking or damaged
Shut off diaphragm faulty
Actuator spring faulty (for control func-
tion NC)
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 leaking or corroded
44 / 52
Troubleshooting
Replace the actuator
Replace the actuator
Check shut off diaphragm for potential
damage, replace diaphragm if necessary
Operate the product with the control pres-
sure specified in the datasheet
Check and replace pilot valve
Replace the actuator
Connect control medium
Remove the actuator, check the dia-
phragm mounting, replace the shut-off
diaphragm if necessary
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 valve body for potential damage,
replace valve body if necessary
Check shut off diaphragm for potential
damage, replace the shut off diaphragm
if necessary
Replace actuator
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 for damage, replace
valve body if necessary
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