4PV72EN - 4/2022
12
6.5 Troubleshooting
Table 7.
Troubleshooting.
Problem
Possible reason
Action
Leakage from flange
connection
Flange connection is loose
Tighten the flange connection bolts to correct torque
Pipeline flanges and valve are misaligned
Check that the flanges are parallel and concentric with the valve
Sleeve lifetime is short
Damaged valve body
Check valve body for scrapes and sharp edges and change if damaged
Unsuitable sleeve material for process
Check with Neles
Damaged pusher
Check pusher for scrapes and sharp edges and change if damaged
Valve does not open/
close or valve is not tight
Fault in actuator or control system
Check and fix actuator operation
Too low pneumatic supply pressure
Fix air supply
Damaged sleeve or pusher
Check and change damaged parts
Valve does not open/
close smoothly
Insufficient lubrication
Lubricate the actuator.
* Manually operated valves are actuated with normal hand force
