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Scandi Brew Anti Vacuum Valve

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Scandi Brew Logo Scandi Brew Anti Vacuum Valve

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


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