Troubleshooting / Fault Clearance - GEM 507 Installation, Operating And Maintenance Instructions For The Installer And The User

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Troubleshooting / Fault clearance

Fault
Medium escapes from the
valve spindle* (underneath
handwheel)
Valve doesn't open or
doesn't open fully
Valve leaks downstream
(doesn't close or doesn't
close fully)
Valve leaks between
bonnet and valve body
Valve body connection to
piping leaks
Valve body leaks
Handwheel cannot be
turned
* see chapter 20 "Sectional drawing and spare parts"
Possible cause
Gland packing faulty
Bonnet faulty
Operating pressure too high
Foreign matter between seat
seal* and seat
Valve body leaky or damaged
Seat seal* faulty
Bonnet loose
Gasket* faulty
Valve body / bonnet damaged
Incorrect installation
Threaded connections / flange
bolting loose
Sealing material faulty
Valve body leaks or is corroded
Bonnet faulty
Control function code L:
Counter nut fixes valve position
29 / 32
Fault clearance
Replace bonnet
Replace bonnet
Operate valve with operating pressure specified
in data sheet
Remove bonnet, remove foreign matter, check
seat seal for damage and replace if necessary
Check valve body and replace if necessary
Check seat seal for damage and replace if
necessary
Retighten bonnet retaining nut*
Check gasket and the respective sealing surfaces
for damage and replace parts if necessary
Replace valve body / bonnet
Check installation of valve body in piping
Retighten threaded connections / flange bolting
Replace sealing material
Check valve body for damage, replace valve body
if necessary
Replace bonnet
Loosen counter nut
507