“BARDIANI reserves the right to modify without notice its products, including products already ordered”.
(GB-IST-YPA-0910)8/21
5. Operation
6. Troubleshooting
6. PRE-USE CHECK VALVE BEFORE OPERATION:
- Supply air to the valve.
- Supply el to the valve (with Giotto top
®
).
- 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 12 for spare parts ordering.
Air
Electrical connections
Giotto-Top
®
Check and
replace gaskets!
Check and
service actuator!
PROBLEM
POSSIBLE CAUSE
POSSIBLE REMEDY
External leakage
Worn out gasket
Replace gasket
Internal leakage withh closed
valve, caused by normal wear
Internal leakage
Too high pressure
Verify operation conditions
Too high temperature
Replace with gasket of different elastomer type
Metal bellows defect
Replace the bellow
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
Dirt/foregin materials between valve seat
and bellows
Clean the valve housing and the bellows
Incorrect positioning of actuator
Assemble actuator correctly
Incorrect operation of actuator
Change from normally open (NO) to normally closed (NC)
or vice versa
Dirt in actuator
Check and service actuator
Incorrect positioning of valve body
Disassemble and reposition valve body