(GB-IST-BBZPM-0413) 8/25
“BARDIANI reserves the right to modify without notice its products, including products already ordered”.
5. Operation
6. Troubleshooting
6. PRE-USE CHECK VALVE BEFORE OPERATION:
- Supply air to the valve.
- Supply el to the valve (see positioner GEMU instruction
manual).
- Open and close the valve several times.
- Check that the valve functions operate correctly and smoothly.
1. TROUBLESHOOTING VALVE:
Always study operation and maintenance
instructions carefully before troubleshooting.
2. REPLACING WORN VALVE PARTS:
- See page 13 for spare parts ordering.
Check and
replace gaskets!
Problem
Possible cause
Possible remedy
External leakage
Worn out gasket
Replace gasket
Internal leakage withh closed
valve, caused by normal wear
External leakage
Too high pressure
Replace with gasket of different elastomer
type
Too high temperature
Internal leakage with closed
valve occurring earlier than
normal wear
Aggressive fluids
Modify operation conditions
Too many active control
Difficult opening and closing
Incorrect elastomer type of
gaskets
Replace with gasket of different elastomer
type
Incorrect positioning of actua-
tor
Assemble actuator correctly
Incorrect operation of actuator
Change from normally open (NO) to nor-
mally closed (NC) or vice versa
Dirt in actuator
Check and service actuator
Incorrect positioning of valve
body
Disassemble and reposition valve body
Corrosion risk of
stainless steel!
Air
Electrical connections
positioner GEMU
