Troubleshooting / Fault Clearance - Gemü DN 15 - 100 Montageanleitung

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Troubleshooting / Fault clearance

Fault
Ball valve doesn't open or
doesn't open fully
Ball valve doesn't close or
doesn't close fully
Ball valve leaks between
operator and ball valve
body
Ball valve body
connection to piping leaks
Ball valve body leaks
Possible cause
Operating pressure too high
Operator design not suitable for
operating conditions
Seat and fl ange seals incorrectly
mounted
Hand lever locking device engaged
Foreign matter in the ball valve
Operating pressure too high
Operator design not suitable for
operating conditions
Seat and fl ange seals incorrectly
mounted
Hand lever locking device engaged
Foreign matter in the ball valve
Ball valve faulty
Seals faulty
Incorrect installation
Flange bolting loose /
threads leaking
Flange seals faulty
Incorrect installation
Seat and fl ange seals incorrectly
mounted
Wrong seat and fl ange seals
mounted
Seat and fl ange seals faulty
Ball valve body faulty or corroded
Fault clearance
Operate ball valve with operating pressure
specifi ed in data sheet
Use operator designed for the operating
conditions
Replace seat and fl ange seals or mount them
correctly (see chapter 12.3)
Disengage hand lever locking device
Disassemble and clean ball valve
Operate ball valve with operating pressure
specifi ed in data sheet
Use operator designed for the operating
conditions
Replace seat and fl ange seals or mount them
correctly (see chapter 12.3)
Disengage hand lever locking device
Disassemble and clean ball valve
Check ball valve for damage, if necessary
replace ball valve
Replace seals
Check installation of ball valve body in piping
Retighten flange bolting / reseal threads
Replace flange seals
Check installation of ball valve body in piping
Mount seat and fl ange seals correctly (see
chapter 12.3)
Replace seat and fl ange seals (see chapter 12.3)
Replace seat and fl ange seals (see chapter 12.3)
Check ball valve body for damage, if necessary
replace ball valve body
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