Troubleshooting / Fault Clearance - Gemü R677 Original Einbau- Und Montageanleitung

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Troubleshooting / Fault clearance

Fault
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
Valve diaphragm incorrectly mounted
Bonnet faulty
Operating pressure too high
Foreign matter between valve
diaphragm and valve body weir
Valve body weir leaking or damaged
Valve diaphragm faulty
Valve diaphragm incorrectly mounted
Bolting between valve body and
bonnet loose
Valve diaphragm faulty
Bonnet / valve body damaged
Incorrect installation
Threaded connections / bolting loose
Sealing material faulty
Valve body faulty
Bonnet faulty
Fault clearance
Remove bonnet, check diaphragm mounting,
replace if necessary
Replace bonnet
Operate valve with operating pressure specified
in data sheet
Remove bonnet, remove foreign matter, check
valve diaphragm and valve body weir for damage
and replace if necessary
Check valve body weir for damage, if necessary
replace valve body
Check valve diaphragm for damage, replace
diaphragm if necessary
Remove bonnet, check diaphragm mounting,
replace if necessary
Retighten bolting between valve body and
bonnet
Check valve diaphragm for damage, replace
diaphragm if necessary
Replace bonnet / valve body
Check installation of valve body in piping
Tighten threaded connections / bolting
Replace sealing material
Check valve body for damage, replace valve
body if necessary
Replace bonnet
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R677