GEM 643 Series, Installation, Operating And Maintenance Instructions

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19 Troubleshooting / Fault clearance
Fault Possible cause Fault clearance
Medium escapes from
leak detection hole*
Valve diaphragm faulty
Check valve diaphragm for damage, replace diaphragm if
necessary
Valve doesn't open or
doesn't open fully
Bonnet faulty Replace bonnet
Valve diaphragm incorrectly
mounted
Remove bonnet, check diaphragm mounting, replace if
necessary
Valve leaks
downstream (doesn't
close or doesn't close
fully)
Operating pressure too high
Operate valve with operating pressure speci fi ed in data
sheet
Foreign matter between valve
diaphragm and valve body
weir
Remove bonnet, remove foreign matter, check valve
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
Valve diaphragm faulty
Check valve diaphragm for damage, replace diaphragm if
necessary
Valve leaks between
bonnet and valve body
Valve 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
Valve diaphragm faulty
Check valve diaphragm for damage, replace diaphragm if
necessary
Valve body / bonnet damaged Replace valve body / bonnet
Valve body connection
to piping / tank leaks
Incorrect installation Check installation of valve body in piping / tank
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
Threaded spindle seized
Regrease the threaded spindle dependent on the
operating conditions; replace bonnet if necessary
(see chapter 13)
* see chapter 20 "Sectional drawing and spare parts"
Note for returns:
Legal regulations for the protection
of the environment and personnel
require that the completed and
signed goods return declaration
is included with the dispatch
documents. Returned goods can
be processed only when this
declaration is completed.
18 Information
Note on Directive 94/9/EC
( ATEX Directive ) :
A supplement to Directive 94/9/EC
is included with the product if it was
ordered according to ATEX.
Note on sta ff training:
Please contact us at the address
on the last page for sta ff training
information.
Should there be any doubts or
misunderstandings in the preceding text,
the German version of this document is the
authoritative document!