Alfa Laval LKB - Troubleshooting Common Issues

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4 Operation
Pay attention to possible breakdown.
Read the instructions carefully.
LKB-F: With flange connection.
NC = Normally closed. NO = Normally open. A/A = Air/air activated.
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:
:
1. Manual flow regulation because of infinite locking positions.
2. Loosen the handle, rotate it and tighten again.
Closed valve
Open valve
Open valve
Closed valve
4.2 Troubleshooting
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!
!
Read the maintenance instructions carefully before replacing worn parts. - See chapter 5.1 General maintenance
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- External leakage
- Internal leakage by closed valve
(normal wear)
- Worn seal ring
- Worn flange seal ring (LKB-F)
Replace the seal ring and the bushes
- External leakage
- Internal leakage by closed valve (too
early)
- High pressure
- High temperature
- Aggressive liquids
- Many activations
- Change rubber grade
- Change the operating conditions
- Difficult to open/close
- Damage to disc connection (high
torque)
Incorrect seal ring (swelling)
Replace by a seal ring of a different rubber
grade
Difficult to open/close
- 90° displacement of the actuator
- Incorrect actuator function (NC,NO)
- Worn actuator bearings
- Dirt penetration into the actuator
- Fit correctly (see chapter 3.4 Fitting
actuator/bracket/handle on the valve
(optional extras))
- ChangefromNCtoNOorviceversa
- Replace the bearings
- Service the actuator
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