8
APV_DE3_UK-7_082017.indd
UK
Double Seat Valve
DELTA DE3
Instruction manual: UK - rev. 7
APV
6. Cleaning
6.3.
Shaft surfaces outside the flow passages (option)
The DE3 valve provides for the areas of the upper and lower
shaft rod which are not subject to cleaning, to be flushed
(fig. 6.3.)
.
The valve is prepared for shaft flushing.
(see chapter 15).
Shaft flushing is recommended with sensible products to
increase product safety and the service life of seals.
The connection of the flushing device is done according to the
pattern described on the left via flushing connections.
6.3.1. Flushing and sterilisation of shaft surfaces
The following flushing liquids are permissible:
- hot water
- (slightly sour to avoid lime residues):
max. 85
o
C
- common CIP liquids:
max. 80
o
C
supply pressure at CIP cleaning
connection:
min. 1 bar
max.
3
bar
flushing quantity per CIP cycle:
about 1.2ltr. / 10s
cleaning
period:
30s
interval:
1x / day (e.g. milk)
depending on product and
operating frequency:
1x / week (e.g. beer)
The free discharge of cleaning liquids must be ensured.
The upper and lower shaft flushing may only be carried
out if product is not imminent in the appertaining part of the
housing.
6.3.2. Installation of hoses:
upper shaft flushing
identification
on spring cylinder
cleaning liquid supply at
B3
IN
cleaning liquid discharge at
B4
OUT
lower shaft flushing
cleaning liquid supply at
B2
cleaning liquid discharge at
C
at drain pipe
B3 IN
B4 OUT
B2 IN
C
fig. 6.3.