Alfa Laval UltraPure Series, Instruction Manual

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4 Operation
Pay attention to possible faults. Study the instructions carefully.
The items refer to the Parts list and service kits section.
4.2 Troubleshooting
Problem Possible cause Repair
Manual valve does not open when
actuator is turned counter-clockwise. 1. Diaphragm has stuck.
2. Diaphragm is not properly mounted
on the actuator.
3. Actuator is broken.
4. Incorrect flow direction in combination
with high fluid pressure.
1. Inspect diaphragm and replace it if
required.
2. Correct mounting. Some force must
be used to push the actuator into the
diaphragm.
3. Inspect and replace if required.
4. Correct flow direction or lower fluid
pressure.
Manual valve does not close when
actuator is turned clockwise. 1. Incorrect flow direction in combination
with high fluid pressure.
2. Actuator is broken.
1. Correct flow direction or lower fluid
pressure.
2. Inspect and replace id required.
Pneumatic valve does not open when
opened via a solenoid valve. 1. Diaphragm has stuck.
2. Diaphragm is not properly mounted
on the actuator.
3. Actuator is broken.
4. Compressed air supply is too low.
5. Pneumatic hose is damaged.
6. Solenoid valve fault or forced in wrong
position manually.
7. Incorrect flow direction in combination
with high fluid pressure.
1. Inspect diaphragm and replace it if
required.
2. Correct mounting. Some force must
be used to push the actuator into the
diaphragm.
3. Inspect and replace is required.
4. Check compressed air supply
pressure.
5. Replace pneumatic hose.
6. Check that the solenoid valve is not
operated manually. Replace solenoid
valve.
7. Correct flow direction or lower fluid
pressure.
Pneumatic valve is open all through
closed via the solenoid valve. 1. Solenoid valve fault.
2. Electrical cable is damaged.
3. Pneumatic system does not ventilate.
4. Incorrect flow direction in combination
with high fluid pressure.
1. Inspect and replace if required.
2. Replace electrical cable.
3. Check ventilation of pneumatic
system.
4. Correct flow direction or lower fluid
pressure.
Cleaning in CIP is not satisfactory. 1. Cleaning chemicals wrong type or too
low concentration.
2. Flow too low.
3. Poor draining.
4. Flow obstructed.
5. Diaphragm broken.
1. Analyse for correct chemicals and
concentration.
2. Increase flow.
3. Check drainabillity and turn valve if
required.
4. Check flow path.
5. Replace diaphragm.
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