Troubleshooting - Gemü 550 Betriebsanleitung

14 Troubleshooting

Error
Control medium escaping from vent hole*
in the actuator cover for control func-
tion NO / connector 2* for control func-
tion NC
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
* see chapter "Spare parts"
www.gemu-group.com
Error cause
Control piston leaking
Spindle seal leaking
Gland packing faulty
Control pressure too low (for control
function NC)
Control medium not connected
Control piston or spindle seal leaking
Actuator spring faulty (for control func-
tion NO)
Operating pressure too high
Foreign matter between seat seal and
seat
Valve body leaks or is damaged
Seat seal faulty
Actuator spring faulty (for control func-
tion NC)
Union nut loose
Sealing washer faulty
Actuator/valve body damaged
Incorrect installation
Threaded connections / unions loose
Sealing material faulty
Valve body leaking or corroded
83 / 92
14 Troubleshooting
Troubleshooting
Replace the actuator and check control
medium for impurities
Replace the actuator and check control
medium for impurities
Replace the actuator
Operate the product with the control pres-
sure specified in the datasheet
Connect control medium
Replace actuator and check control me-
dium for impurities
Replace the actuator
Operate the product with operating pres-
sure specified in datasheet
Remove actuator, remove foreign matter,
check seat seal for damage and replace
seat seal if necessary
Check valve body for damage, replace
valve if necessary
Check seat seal for damage and replace
seat seal if necessary
Replace actuator
Retighten union nut
Check sealing washer and the respective
sealing surfaces for damage and replace
parts if necessary
Replace the 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 550