Alfalaval Unique Mixproof User Manual

4Operation
The valve is designed for cleaning in place (CIP). CIP = Cleaning In Place.
Study the instructions carefully and pay special attention to the warnings!
NaOH = Caustic Soda. HNO
3
= Nitric acid.
Internal leakage in the valve is externally visible by means of the leakage outlet.
Step 4
Examples of cleani
ng agents:
Use clean water, free from chlorides.
1. 1% by weight NaOH at 70
o
C (158°F) . 2. 0.5% by weight HNO
3
at 70
o
C(158
°
F).
1kg(2.2lb)
NaOH
+
100l(26.4gal)
water
=
Cleaning agent.
0.7 l (0.2 gal)
53% HNO
3
+
100 l (26.4 gal)
water
=
Cleaning
agent.
2.2 l (0.6 gal)
33%NaOH
+
100l(26.4gal)
water
=
Cleaning agent.
Step 5
1. Avoid excessive concentration of the cleaning agent
=> Dose gradually!
2. Adjust the cleaning flow to the process.
Milk sterilization/viscous liquids
=> Increase the cleaning flow!
Step 6
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 va
lve seat lift (takes place during cleaning of upper valve body)
2. Lower va
lve 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 21psi (1.5 bar) CIP
pressu
re. 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 s
eat lift
3Energi
zed
*0.5 se
c
3
Lower seat lift 2 Energized *0.5 sec 3
Spira
lClean vent
--
*0.5 s
ec
3
Warm pre-rinse @
3minutes
OD cleaning
--
*5 sec 2
Uppe
r seat lift
3Ener
gized
*0.5
sec
3
Lower seat lift 2 Energized *0.5 sec 3
Spir
alClean vent
--
*0.5
sec
3
Hot alkaline wash
@ 10 minutes
OD cleaning
--
*5 sec 2
Upp
er seat lift
3Ene
rgized
*0.
5sec
3
Lower seat lift 2 Energized *0.5 sec 3
Sp
iralClean vent
--
*0.
5sec
3
Cold post wash @
3minutes
OD cleaning
--
*5 sec 2
Up
per seat lift
3En
ergized
*0
.5 sec
3
Lower seat lift 2 Energized *0.5 sec 3
S
piralClean vent
--
*
0.5 sec
3
Cold acidified rinse
@3minutes
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.
20

Alfalaval Unique Mixproof Specifications

General

Brand	Alfalaval
Model	Unique Mixproof
Category	Control Unit
Language	English