7
APV_DE3_UK-7_082017.indd
UK
Double Seat Valve
DELTA DE3
Instruction manual: UK - rev. 7
APV
6. Cleaning
Cleaning DELTA DE3 valves, one has to distinguish between
three areas:
6.1.
The flow areas
The upper and lower passages are cleaned by the passing
cleaning liquid during the cleaning of the connected pipelines.
6.2.
The lekage chamber (fig. 6.2.)
The cleaning of the leakage chamber is undertaken by CIP
spraying. CIP cleaning connection
(B1)
.
CIP must generally be undertaken.
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 perfect cleaning
of the whole leakage chamber.
Under standard conditions
15 valves DN 40 - 100, 1,5" - 4"
10 valves DN 125 - 150, 6” can be cleaned
via one spray distribution line DN 25.
6.2.1. Cleaning recommendation on intervals and spraying liquids
under standard operating conditions and with common
CIP liquids
cleaning step
CIP cycle
pre-flushing
3 x 10 sec.
caustic flushing 80° C
3 x 10 sec.
intermediate flushing
2 x 10 sec.
acid flushing
3 x 10 sec.
subsequent flushing
2 x 10 sec.
Depending on the pressure ratio, cleaning temperatures and the
degree of soiling, different cycles must be adjusted.
The compatibility of the individual cleaning processes and liquids
with the respective seal materials must be verified.
7.2.2. Flushing quantities:
per CIP cycle DN 40 - 100, 1,5” - 4”
about 1.2ltr. / 10s
DN 125-150, 6"
about 5ltr. / 10s
7.2.3. Cleaning pressure at
CIP cleaning connection (B1):
min. 2bar
max.
5bar
B1
fig. 6.2.