9.1.3 Cleaning the Leakage Cavity
On the mixproof butterfly valve, two connections for flushing are provided at the
deepest point of the housing to enable cleaning of the leakage cavity.
A special sealing mechanism allows the valve to be operated without any
additional shut-off valves.
•
Cleaning liquid is flushed into the leakage cavity through one of the flushing
connections.
•
The second flushing connection is used for discharging medium and as a
leakage indicator in the event of sealing damage.
•
When the pipe is cleaned, it is recommended to completely open and close
the flap twice per minute (at least 6 times per cleaning operation) so that
medium flows around it, in order to clean the areas underneath the flap.
The leakage cavity can be flushed via the leakage connections when the flap is
closed. The recommended admission pressure for the cleaning medium supply at
the inlet valve to the leakage cavity is 2.5 bar ± 0.5 bar. Pressure build-up
between the seals on the valve disk should always be avoided. Non-pressurized
discharging at the outlet valve is therefore required. Generally also ensure a
positive pressure difference from the product chamber to the leakage cavity. We
recommend also cleaning the leakage cavity as part of all cleaning steps using
the relevant cleaning media.
The duration of the entire washing process depends on the type of soiling and
typically ranges between 10 and 90 seconds.
Flow rates for cleaning the leakage cavity
Size
DN
50 2"
OD
2.5" OD DN 65 3" OD DN 80
DN 100 4"
OD
Kvs
values
(l/h)
194 198 178 203 188 163
The table lists the values for the duration and number of rinsing operations.
Medium Duration (s)
Number of
rinsing
operations
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
Milk 2...5 3
Cleaning
Cleaning
430BAL010337EN_7
36 29.07.2021
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