APV DELTA DA3+ SLD, Operating Manual

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7
UK
DELTA DA3SLD-UK0.qxp / 12.2007
Double Seat Mixproof Valve with Seat Lift Detection
DELTA DA3+SLD
Operating Manual: Rev. 0
5. Cleaning
For cleaning of the DELTA DA3+ valve, one has to distinguish
between three areas:
5.1 The flow areas
The upper and lower passages are cleaned by the passing
cleaning liquid during cleaning of the connected pipelines.
5.2 The seal surfaces
The seal surfaces of the upper area (upper shaft and seat seal)
and the lower area (lower shaft and seat seal) are flushed and
cleaned by cleaning liquid during the lifting of the individual valve
shafts during cleaning of the respective passage.
5.3 The leakage chamber
The Cleaning of the leakage chamber is undertaken by CIP
spraying. CIP cleaning connection
(C) .
The valve shafts being lifted, the CIP liquid also cleans the
leakage chamber.
Spraying does not produce pressure build-up in the leakage
chamber and can be carried out in closed and in open valve
position. The conduct of the cleaning liquid provides for a
biologically perfect cleaning of the whole leakage chamber.
Under normal conditions
15 valves DN 40 - 100 / 1,5” - 4”
10 valves DN 125 - 150 can be cleaned via one spray
distribution line DN 25.
5.4 Cleaning recommendation:
- The lifting cycles refer to a cleaning pressure of p = 2 - 5 bar.
- Depending on the pressure ratio, cleaning temperatures, cleaning
steps and degree of soiling, different cycles must be adjusted.
- Flushing quantities per CIP spraying cycle:
DN 40 -100 / 1,5” - 4” ca. 1,2ltr/10s
DN 125, 150 ca. 5ltr/10s
- Cleaning pressure at CIP cleaning connection: min. 2 bar.
max. 5 bar.
cleaning step
pre-flushing
caustic flushing 80 oC
intermediate flushing
acid flushing
subsequent flushing
CIP spraying
3 x 10 sec.
3 x 10 sec.
2 x 10 sec.
3 x 10 sec.
2 x 10 sec.
lifting cycle
3 x 5 sec.
2 x 5 sec.
3 x 5 sec.
2 x 5 sec.
C
fig. 5.3
CIP - spraying
free drain
CIP liquid