GEM 653 User Manual

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653, 654
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
Bonnet faulty Replace bonnet
Shut off diaphragm incorrectly
mounted
Remove bonnet, check diaphragm mounting,
replace if necessary
Stroke limiter is incorrectly set Reset stroke limiter
With special version "K (MAG /
LOC)" locking device closed
Unlock locking device
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 bonnet, 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
Shut off diaphragm faulty
Check shut off diaphragm for damage, replace
diaphragm if necessary
Seal adjuster is incorrectly set Reset seal adjuster (see chapter 11.3)
With special version "F (MAG /
LOC)" locking device closed
Unlock locking device
Valve leaks between
bonnet and valve body
Shut off diaphragm incorrectly
mounted
Remove bonnet, check diaphragm mounting,
replace if necessary
Bolting between valve body and
bonnet loose
Retighten bolting between valve body and bonnet
Shut off diaphragm faulty
Check shut off diaphragm for damage, replace
diaphragm if necessary
Bonnet / valve body damaged Replace bonnet / valve body
Valve body connection to
piping leaks
Incorrect installation Check installation of valve body in piping
Bolting / threaded connections
loose
Tighten bolting / threaded connections
Sealing material faulty Replace sealing material
Valve body leaks Valve body faulty or corroded
Check valve body for damage, replace valve body if
necessary
Handwheel cannot be
turned
Bonnet faulty Replace bonnet
With special version "B (MAG /
LOC)" locking device closed
Unlock locking device
Threaded spindle seized
Dependent on the operating conditions, regrease the
threaded spindle; replace bonnet if necessary.
See chapter 15.
Proximity switch
continuously responds
Wrong proximity switch used Only use proximity switch that can be mounted flush
* see chapter 21 "Sectional drawing and spare parts"

GEM 653 Specifications

General

Brand	GEM
Model	653
Category	Control Unit
Language	English