Application
To minimise risk of implosion of
tanks exposed to vacuum
(e.g. during emptying, cool rinsing after
hot-cleaning
(max. 85 °C) or caustic cleaning in a CO2 atmosphere). To
be
applied on any closed tank.
Construction
The dead weight
anti vacuum valve is available in two
versions:
. Integrated in to a
SCANDI BREW® tank top system
. Mounted on its own counter flange
The
advantages of an integrated anti vacuum valve are lower
initial costs,
superior hygiene and smaller area required to
seat valve.
The valve is
available in the following sizes:
The size and setting of the anti vacuum
valve is based on the
tank design data, cleaning procedure and process
requirements.
The anti vacuum valve is produced in a sanitary and
robust
design.
Materials
All metallic
parts: Stainless steel AISI 304
(or acc. to customer specification)
O-ring
seal: NBR, 45° shore
All other parts: Non-toxic food grade materials
It is
very important to note that if the cleaning procedure
includes hot-cleaning
(max. 85 °C) the valve should be
dimensioned with the purpose of preventing
implosion from
the vacuum that appears when flushing with cold
water.
Diameter Operation Range
80 mm 100 mm - 300 mm
W.G.
100 mm 100 mm - 300 mm W.G.
150 mm 75 mm - 200 mm W.G.
200 mm 75
mm - 150 mm W.G.
250 mm 50 mm - 100 mm W.G.
300 mm 50 mm - 100 mm
W.G.
400 mm 25 mm - 75 mm W.G.
450 mm 25 mm - 50 mm W.G.
The size and setting of the anti vacuum valve is
based on the
tank design data, cleaning procedure and process
requirements.
The anti vacuum valve is produced in a sanitary and
robust
design.
Materials
All metallic parts: Stainless
steel AISI 304
(or acc. to customer specification)
O-ring seal: NBR, 45°
shore
All other parts: Non-toxic food grade materials
It is very important
to note that if the cleaning procedure
includes hot-cleaning (max. 85 °C) the
valve should be
dimensioned with the purpose of preventing implosion
from
the vacuum that appears when flushing with cold water.
Other factors to be considered when sizing the valve
include:
tank size and dimensions as well as maximum emptying
speed.
Heating elements are available for valves exposed to
subzero
temperatures. A heating tape is supplied for the flange
mounted
valves whereas valves integrated in a tank top
system are heated
by means of heating blocks mounted on
the tank top system close to the
valve.
Operation
The anti vacuum valve is
delivered with counter weight set for
an individual opening vacuum to suit
the tank design data.
When a vacuum in the tank is lower than the preset
opening
value, the valve opens and lets in atmospheric air.
Cleaning
The anti vacuum valve is
cleaned, when closed, by the tank
cleaning head, but this will not include
the valve disc.
To include the valve disc in the cleaning cycle a CIP
device
can be mounted on the valve.
The CIP device uses the CIP pressure
to open the valve and
cleaning liquid flushes the valve disc and drains back
in to the
tank.
The CIP device is supplied with a splashguard to
catch
reflecting sprays.
Note: Applying the CIP device provides that
cleaning takes
place in a pressure less tank.
Benefits
. Valve seat design ensures
operational reliability
. Sensitive vacuum set points for precise
operation
. Fully cleanable with CIP system
. Minimal and low-cost
maintenance demand
Mounting
The anti vacuum valve should be
seated horizontally.
An inclination of max. 10° is acceptable but the lever
arm
must then point in to the centre of the cylindro-conical tank
top.
Maintenance
Requires periodic manual
cleaning of the valve assembly and
test of the function. O-ring replaced
every 3-5 years. With
heating elements the O-ring is replaced every 2-3
years.
Extra equipment
. Heating elements for
valves exposed to sub-zero
temperatures
. CIP force opening device with
splashguard incl. stainless
steel CIP feeding pipe
. Pneumatic force
opener
. Proximity switch with mounting fitting for signalling if
the
valve has been open
. Weather cowl with spray catcher
