Alfa Laval Unique Mixproof 3-body, Инструкция по эксплуатации

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4 Operation
The valve is designed for cleaning in place (CIP).
Study the instructions carefully and pay special attention to the warnings!
NaOH = Caustic soda.
HNO
3
= Nitric acid.
Step 7
Valve pneumatic operation during in-place cleaning
Each valve seat shall be lifted during the length of the cleaning cycle.
Seat lift durations shall not exceed 10 seconds.
These pneumatic functions include:
1. Upper valve seat lift (takes place during cleaning of upper valve body)
2. Lower valve seat push (takes place during cleaning of lower valve body)
The following chart presents an overview of these functions together with the recommended time durations at 1.5 bar (21psi) CIP
pressure. It is recommended to do seat lift/push in the middle of each step in the CIP sequence.
CIP event @ length Valve function
Valve
solenoid no.
Solenoid
mode
Actual opening
time
Number of lifts/push
in each CIP step
Upper seat lift
3
Energized
*0.5 sec 1
Lower seat lift 2
Energized
*0.5 sec 1
SpiralClean vent - -
*5 sec 3
Warm pre-rinse @
3 minutes
OD cleaning - -
*5 sec 2
Upper seat lift
3
Energized
*0.5 sec 2
Lower seat lift 2
Energized
*0.5 sec 2
SpiralClean vent - - *5 sec 3
Hot alkaline wash
@ 10 minutes
OD cleaning - - *5 sec 2
Upper seat lift 3 Energized *0.5 sec 1
Lower seat lift 2 Energized *0.5 sec 1
SpiralClean vent - - *5 sec 3
Cold post wash @
3 minutes
OD cleaning - - *5 sec 2
Upper seat lift
3
Energized
*0.5 sec 1
Lower seat lift 2
Energized
*0.5 sec 1
SpiralClean vent - -
*5 sec 3
Cold acidified rinse
@ 3 minutes
OD cleaning - -
*5 sec 2
Upper seat lift
3
Energized
*0.5 sec 1
Lower seat lift 2
Energized
*0.5 sec 1
SpiralClean vent - -
*5 sec 3
Final rinse @
3 minutes
OD cleaning - -
*5 sec 2
*Time stated is the actual opening time for the valve. Programmed duration is depended on the access to compressed air and response
time from PLC.
Variations caused by compressed air are typically:
- Long compressed air supply hoses.
- Small ID on air supply hoses.
- Limited availability of compressed air.
- Some products may require additional number of seat lifts/pushes.
- Duration of seat lift/push depend on available CIP pressure.
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