4Operation
Pay attention to possible faults. Study the instructions carefully.
The items refer to the parts list and service kits section.
4.2 Troubleshooting
NOTE!
Study the maintenance instructions carefully before replacing worn parts - see page 15!
Problem
Cause/result
Repair
External product leakage Worn or product affected lip
seal and/or O-ring
- Replace the seals
- Replace with seals of a
different rubber grade
Internal product leakage - Worn or product affected
plug seal
- Replace the seal
- Replace with a seal of a
different rubber grade
- Product deposits on
the seat and/or plug
- Frequent cleaning
- Product pressure exceeds
actuator specification
- Replace with a high pressure actuator
- Use auxiliary air on the spring side
- Reduce product pressure
Water hammer The flow direction is the
same as the closing direction
The flow direction should be
against the closing direction
The valve does not
open/close
Product pressure exceeds
actuator specification
Reduce product pressure
12
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