GEA VARIVENT 24/7 PMO, Руководство по эксплуатации

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9.1.3 Cleaning the leakage outlet of the mixproof valve type M/ 2.0
The leakage outlet is cleaned by lifting the upper or lower valve disk when the
respective pipe is cleaned. During this process, cleaning fluid flows past the seals
via a metal throttle gap in the leakage outlet and cleans the seal surfaces of the
lifted valve disc and the leakage outlet.
This kind of leakage outlet cleaning process is used for sensitive media, in which
the seal surfaces also need to be cleaned in order to flush away micro-organisms
that may have adhered to them. This kind of cleaning is also recommended for
media that adheres and crystallises.
9.1.4 Cleaning of the lower balancer
Optionally, those surfaces of the lower balancer that come into contact with the
product can be cleaned during seat cleaning.
When the lower valve disk is lifted, the gap between the lower balancer seal and
the valve disk is exposed automatically. This allows the cleaning fluid to enter the
Balancer Cleaning Device and thereby clean the surface of the balancer.
9.1.5 Examples for cleaning by lifting
Examples
Medium Duration
[s] Number of venting
the valve disk Comments
Beer 1-2 2-3 During every
cleaning phase:
1. Prerinse
2.
Hot caustic
3. Intermediate
rinse/
4.
Acid
5. Rinse
Yeast 1-2 2-3
Fruit juice 2-6 3
Milk 2-5 3
Yoghurt 3-5 3
The recommended cleaning pressure is min. 2 bar (29 psi) at a flow speed of
≥1.5m/s.
The component manufacturer can only make a recommendation on the type of
cleaning with respect to cleaning agents, temperature, times and intervals, but no
binding information can be given. This should be determined or defined by the
operating company depending on the process.
Depending on the cleaning method (medium, concentration, temperature and
contact times), the seals are affected to different degrees. This can impair the
function and the service life.
9.2 Passivation
Before commissioning a plant, passivation is commonly carried out for long pipes
and tanks.
Cleaning
Passivation
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