Application
To minimise risk of tank damage due
to implosion and overpressure.
Applicable as an option to dead weight or
spring
regulated safety valves. Please see separate PD
leaflets.
Construction
The combined safety valve
comprises a vacuum valve housing
with an overpressure safety valve on top.
The valve is
available with the overpressure design in the
following
versions:
. Bursting disc
. Spring loaded overpressure valve
or remote controlled
Pressure Exhaust (PE) valve
. Dead weight pressure
relief valve
Please see separate PD leaflets.
Available sizes:
3" / DN80 70 mm 50 or 80 mm 11⁄2" or 2" 2" or 3"
4" / DN100
100 mm 80 or 100 mm 11⁄2", 2" or 3" 2", 3" or 4"
6" / DN150 150 mm 80 or 100
mm 11⁄2", 2" or 3" 2", 3", 4" or 6"
8" / DN200 200 mm 80 or 100 mm 11⁄2", 2"
or 3" 2", 3", 4" or 6"
Size and choice of valve type should be made based on
the
tank design data and process requirements.
Materials:
All metallic parts:
Stainless steel AISI 304
(or acc. to customer specifications)
Valve
bodies: PP
Valve gasket: NBR. Non-toxic food grade materials.
Bursting
discs: Graphite
The vacuum valve housing is supplied with a built-in
CIP
nozzle that ensures complete cleaning inside the housing.
CIP
connection: 1/4" BSP socket.
Operation
The anti vacuum valve
operates as standard at 50-75 mm
W.G. depending on valve size.
The pressure relief
valve/bursting disc ensures pressure
exhaust if pressure in the tank exceeds
the preset opening
value.
Cleaning
The vacuum valve housing can be
cleaned during tank CIP
cycle by connecting CIP nozzle to main CIP
supply.
When the tank is cleaned pressureless a small volume of
cleaning
fluid will pass the vacuum valve body and clean the
seat. To ensure thorough
flushing of valve seat, force opening
of the valve is necessary - this is
also done when the tank is
pressureless.
The use of a drain collector is
recommended to prevent
detergent from running over tank top.
Mounting
The unit is as standard
delivered with a 90 bend ending in a
liner and nut. The valve house should
be placed in an upright
position.
Maintenance
Requires routine check of
function. Replacement of valve
joints is recommended every 2-3 year depending
on CIP procedure.
Benefits
. Design ensures operational
reliability
. Low vacuum set points
. Fully cleanable with CIP system
.
Compact design and easy mounting
Special Versions
The vacuum valve housing
is available with a flanged tank
connection and can also be supplied with
horizontal mounting
pipe end. If only anti vacuum safety is required the
upper
valve part can be blanked off.
Extra Equipment
. For bursting disc:
Protecting cover
. For spring loaded
overpressure valve: Adjustable
spring, proximity switch and
force opener.
. For PE valve: CIP bypass
.
For vacuum valve: Drain collector, proximity switch, force
opener and
stainless steel CIP pipe for
CIP nozzle.
. Heating elements.
