GEM R693, Installation, Operating And Maintenance Instructions

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R693
20 Troubleshooting / Fault clearance
Fault Possible cause Fault clearance
Working medium escapes
from leak detection hole*
Shut off diaphragm faulty
Check shut off diaphragm for damage,
replace diaphragm if necessary
Valve doesn't open or doesn't
open fully
Shut off diaphragm incorrectly
mounted
Remove actuator, check diaphragm
mounting, replace if necessary
Actuator faulty Replace actuator
Voltage is not connected Connect voltage
Incorrect assembly
Check assembly and wiring of the electrical
connection
Valve leaks downstream
(doesn't close or doesn't close
fully)
Operating pressure too high
Operate valve with operating pressure
specified in data sheet
Foreign matter between shut off
diaphragm and valve body weir
Remove actuator, remove foreign matter,
check diaphragm and valve body weir for
damage and replace if necessary
Valve body weir leaking or
damaged
Check valve body weir for damage, if
necessary replace valve body
Actuator faulty Replace actuator
Voltage is not connected Connect voltage
Incorrect assembly
Check assembly and wiring of the electrical
connection
Shut off diaphragm faulty
Check shut off diaphragm for damage,
replace diaphragm if necessary
Valve leaks between actuator
and valve body
Shut off diaphragm incorrectly
mounted
Remove actuator, check diaphragm
mounting, replace if necessary
Bolting between valve body and
actuator loose
Retighten bolting between valve body and
actuator
Shut off diaphragm faulty
Check shut off diaphragm for damage,
replace diaphragm if necessary
Valve body / actuator damaged Replace valve body / actuator
Valve body connection to
piping leaks
Incorrect installation Check installation of valve body in piping
Bolting loose Tighten bolting
Sealing material faulty Replace sealing material
Valve body leaks
Valve body faulty
GEMÜ 698: Valve body corroded
Check valve body for damage, replace valve
body if necessary
* see chapter 21 "Sectional drawing and spare parts"