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15 Troubleshooting
Error
The product doesn't open or doesn't open
fully
The product leaks downstream (doesn't
close or doesn't close fully)
The product doesn't close or doesn't
close fully
Connection between valve body and
piping leaking
Valve body leaks
Increased switching noises when opening
the product
Actuator does not open or does not open
correctly
Actuator leaking at the mounting flange
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Possible cause
Actuator defective
Operating pressure too high
Foreign matter in the product
The actuator design is not suitable for the
operating conditions
Flange dimensions do not comply with
specifications
Inside diameter of piping too small for
nominal size of product
Operating pressure too high
The actuator design is not suitable for the
operating conditions
Foreign matter in the product
Incorrect installation
Threaded connections / unions loose
Sealing material faulty
Valve body leaks or is corroded
Incorrect installation
When the disc is in the closed position,
this may cause a higher breakaway
torque
Control medium not connected
End positions incorrectly set
Stroke limiter (optional) incorrectly set
Contaminated control medium
Actuator damaged
Valve body damaged
Unions loose
Incorrect assembly
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15 Troubleshooting
Troubleshooting
Replace the actuator
Operate the product with operating
pressure specified in datasheet
Remove and clean the product
Use an actuator that is designed for the
operating conditions
Use correct flange dimensions
Install product with suitable nominal size
Operate the product with operating
pressure specified in datasheet
Use an actuator that is designed for the
operating conditions
Remove and clean the product
Check installation of valve body in piping
Tighten threaded connections / unions
Replace sealing material
Check valve body for damage, replace
valve body if necessary
Check installation of valve body in piping
Use the product regularly
Connect the control medium
Correctly set the end positions (see
"Setting the end positions")
Correctly set the stroke limiter (optional)
Disassemble and clean the actuator,
install a filter upstream
Check the actuator for potential damage,
replace the actuator if necessary
Check valve body for potential damage,
replace valve body if necessary
Tighten unions
Check actuator mounting on the valve
body
GEMÜ R481
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