Troubleshooting / Fault Clearance - GEM 565 Installation, Operating And Maintenance Instruction

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Troubleshooting / Fault clearance

Fault
Control medium escapes
from vent holes and leak
detection holes*
Working medium escapes
from vent holes and leak
detection holes*
Valve doesn't open or
doesn't open fully
Valve leaks downstream
(doesn't close or doesn't
close fully)
Valve leaks between
eactuator and valve body
Valve body connection to
piping leaks
Valve body leaks
* see chapter 20 "Sectional drawing"
565
Possible cause
Actuator* faulty
Isolating diaphragm* faulty
Control pressure too low
Control medium not connected
Actuator* faulty
Positioner faulty
Positioner not connected
Operating pressure too high
Foreign matter between
regulating cone* and seat
Valve body leaky or damaged
Regulating cone* faulty
Actuator* faulty
Union nut* loose
Isolating diaphragm* faulty
Valve body / actuator damaged
Incorrect installation
Threaded connections /
clamp is loose
Sealing material faulty
Valve body leaks or is corroded
Fault clearance
Check control medium for impurities, send valve to
GEMÜ for repair if necessary
Send valve to GEMÜ for repair
Set control pressure in accordance with data sheet
Connect control medium
Send valve to GEMÜ for repair and check control
medium for impurities
Replace positioner
Replace positioner
Operate valve with operating pressure specified in
data sheet
Send valve to GEMÜ for repair
Send valve to GEMÜ for repair
Send valve to GEMÜ for repair
Send valve to GEMÜ for repair
Tighten union nut with a pin wrench (pin size 6 mm)
Send valve to GEMÜ for repair
Send valve to GEMÜ for repair
Check installation of valve body in piping
Tighten threaded connections / clamp
Replace sealing material
Check valve body for damage, send valve to GEMÜ
for repair if necessary
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