4Operation
The valve is adjusted and tested before delivery.
Study the instructions carefully and pay special attention to the warnings!
Pay attention to possible faults.
The items refer to the parts list and service kits section.
4.2 Fault finding and repair
NOTE
Study the maintenance instructions carefully before replacing worn parts.
Problem
Cause/result
Repair
Leakage between sealing element (79)
and lower plug (7
5)
Worn/product affected o-rings/ lip seal
(76/77/78)
- Replace the o-rings/lip seal
- Change rubber grade
- Lubricate correctly
Leakage at the leakage outlet - Particles between valve seats and plug
seals (56/74)
- Worn/product affected plug seal rings
(56/74)
- Plug not assembled correctly
-Removetheparticles
- Check the plug seals
- Replace the plug seals
- Change rubber grade
- Assemble plug, see step 3 section 5.5
Valve assembly
Leakage at sealing element (48)/upper
plug (55)
Worn/product affected o-rings/lip seal
(sizes 38/
39/46/49)
- Replace the o-rings/lip seal
- Change rubber grade
- Clean and if necessary replace guide
ring (45)
Leakage at clamp (64) - Too old/product affected o-rings (76
and 47) (and 52 if clamped valve body)
- Loose clamp (64)
- Replace the o-rings
- Change rubber grade
-Tightentheclamp
CIP leakage Worn o-rings (40/67/71)
Replace the o-rings
Leakage at spindle clamp (43) Damaged o-ring (39) W orn/product
affected lip seal (57) or spray nozzle (58)
- Replace the o-ring
- Replace the plug seals
- Change rubber grade
Lower plug not returning to closed
pos
ition
- Wrong rubber grade
- Wrongly fitted gasket
- Mounted incorrectly (see section 2.3)
- Change rubber grade
- Fit new gasket correctly
- Correct installation
Plug returns with uneven movements
(slip/stick effect)
- Wrong rubber grade
- Wrongly fitted gasket
- Mounted incorrectly (see section 2.3)
- Change rubber grade
- Fit new gasket correctly
- Correct installation
18
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