Troubleshooting - GEM 650TL Operating Instructions Manual

17 Troubleshooting

Error
Control medium escaping from vent
(GEMÜ 650 1TL/2TL) / vent hole
(GEMÜ 650 0TL)
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
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Possible cause
Piston faulty
Spindle seal leaking
Diaphragm faulty
Control pressure too low (for control
function NC)
Pilot valve faulty
Actuator defective
Control medium not connected
Shut-off diaphragm incorrectly mounted
Stroke limiter is incorrectly set (only for
GEMÜ 650 1TL and 650 2TL)
Handwheel is in the closed position
Operating pressure too high
Foreign matter between shut-off dia-
phragm and valve body
Valve body leaks or is damaged
Shut-off diaphragm faulty
Actuator spring faulty (for control func-
tion NC)
Seal adjuster is incorrectly set (only ef-
fective when control medium is applied to
the actuator)
Handwheel open when control medium is
applied
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
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17 Troubleshooting
Troubleshooting
Replace the actuator
Replace actuator and check control me-
dium for impurities
Check 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
Reset stroke limiter
Move the handwheel to the open position
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
Reset seal adjuster
Move the handwheel to the closed posi-
tion
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
GEMÜ 650TL