3
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Product
description
0870169324
_VD
0025
‐
0100G_
‐
0006_IM_en
9
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46
3.4
Function
principle
3.4.1
Vacuum
system
VD
Gas
delivery
from
the
vacuum
vessel
is
effected
by
the
single
‐
stage
rotary
vane
vacuum
pump.
Pressure
gas
is
exhausted
against
the
atmosphere.
The
target
values
are
set
to
the
desired
switch
‐
on
and
switch
‐
off
values
on
the
contact
vacu
‐
um
gauge
on
the
vacuum
vessel.
When
the
lower
switching
point
is
reached,
the
vacuum
pump
is
switched
off.
When
the
vacuum
in
the
vacuum
vessel
is
used
up,
the
pressure
in
the
vessel
increases
and
when
the
upper
switching
point
is
reached,
the
vacuum
pump
is
switched
on
again
and
evacuates
the
vacuum
vessel.
3.4.2
Rotary
vane
vacuum
pump
R5
RA
Fig.
3:
Operating
principle
of
the
rotary
vane
vacuum
pump
R5
RA
The
vacuum
pump
R5
RA
works
according
to
the
rotary
vane
principle.
The
oil
seals
the
spaces,
lubricates
the
sliders
and
discharges
the
compression
heat.
The
oil
fil
‐
ter
cleans
the
circulating
oil.
Then
the
exhaust
filters
separate
the
oil
from
the
discharged
gas.
3.4.3
Gas
ballast
valve
The
vacuum
pump
is
equipped
with
a
gas
ballast
valve.
The
gas
ballast
valve
is
used
for
the
addition
of
a
limited
quantity
of
ambient
air
to
the
process
gas,
to
counteract
the
condensa
‐
tion
of
vapor
in
the
vacuum
pump.
The
gas
ballast
valve
reduces
the
final
pressure
of
the
vac
‐
uum
pump,
see
“Technical
data”
in
chap.
15.
3.5
Intended
use
The
vacuum
system
was
designed
for
conveying
air
and
other
dry,
non
‐
aggressive,
non
‐
toxic
and
non
‐
explosive
gases.
Conveying
any
other
media
leads
to
increased
thermal
and/or
mechanical
stress
of
the
vacu
‐
um
system
and
is
only
permitted
in
coordination
with
Busch.
The
vacuum
system
is
designed
for
operation
in
a
non
‐
hazardous
area.
The
vacuum
system
can
be
operated
continuously
at
final
pressure
and
is
suitable
for
continuous
operation.
The
permitted
ambiance
conditions
can
be
found
in
the
technical
data
(chap.
15).
The
vacuum
system
is
designed
for
indoor
use;
for
outdoor
installation,
contact
Busch
to
make
special
arrangements
if
necessary.
