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17 Information
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18 Troubleshooting / Fault clearance
Fault
Working medium escapes from
leak detection port* and / or
threaded handwheel spindle
(dependent on mounting position)
Valve doesn't open or doesn't
open fully
Valve leaks downstream (doesn't
close or doesn't close fully)
Valve body connection to piping
leaks
Handwheel cannot be turned
* see chapter 10 "Construction"
** see chapter 11.3 "Setting the seal adjuster"
C67
Possible cause
Diaphragm faulty
Bonnet faulty
Operating pressure too high
Foreign matter between diaphragm
and valve body weir
Valve body weir damaged
Diaphragm faulty
Travel stop** incorrectly set
Incorrect installation
Union nuts loose
Bonnet faulty
36 / 40
Fault clearance
Replace valve
Replace valve
Operate valve with operating pressure
specified in data sheet
Replace valve
Replace valve
Replace valve
Correctly adjust travel stop
Check installation of valve body in piping
Tighten union nuts
Replace valve
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