8 Trouble-shooting
25 of 32
COBRA-TDC01/03
8194.8/02-EN
8 Trouble-shooting
WARNING
Improper remedial work on the valve
Risk of injury!
▷
For any work performed in order to remedy faults on the valve observe the
relevant information given in this operating manual and/or the product
literature provided by the accessories manufacturers.
If problems occur that are not described in the following table, consultation with the
service is required.
Table 9:
Trouble-shooting
Problem
Possible cause
Remedy
Valve noise
Unfavourable installation position
causing unfavourable flow around
or inside the valve (e.g. insufficient
distance from a downstream elbow,
etc.)
Change installation position.
Valve operated beyond its design
limits
Check design data and/or operating
data; change flow resistance of valve.
Valve cannot be actuated.
Foreign matter jammed in the seat
area
Flush valve, dismantle, if necessary, and
remove foreign matter.
Gearbox is blocked.
Deblock.
Electric actuator is not connected.
Make electrical connection.
Unfavourable flow conditions and
restricted movement
Change installation position.
Leakage at the seat/disc interface
Valve not fully closed
Fully close the valve.
Sealing element damaged or worn
Replace the sealing element.
Cavitation inside the valve
Valve operated beyond its design
limits
Valve unsuitable; replace with suitable
valve or change operating conditions.
Operating data changed
Leakage at the body
Defective sealing elements
Replace sealing elements.
High external forces
Replace body; check for water hammer.
High actuating forces
Deposits at valve seat
Flush valve, dismantle, if necessary, and
clean seat area.
Dry piping environment, i.e. valve is
not in contact with fluid handled.
Verify contact with fluid handled.
Summary of Contents for COBRA-TDC01/03
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