Speck pumpen VZ 11 B Series, Operating Instructions Manual

Page: 20 / 48

OPERATING INSTRUCTIONS
20
may be omitted, if the vacuum pump will be
run only a few minutes and if the liquid in the
system cools down to ambient temperature
during the period before it is used next.
5.5.3 Continuous cooling
The continuous cooling is effected, if sufficient
liquid is available, for which it is not important
being recycled as operating liquid.
The setting up is to be effected according to
illustr. 5a. The connection U
U
will be sealed.
The operating liquid B consists of clean liquid
F. The required pressure of clean liquid should
not considerably exceed 0 bar (atmospherical
pressure).
If the pressure of clean liquid is considerably
fluctuating (from time to time an over pressure
of 0,2 bar will be exceeded), it is useful to
provide a pressure reducing valve r
F3
(illustr.
3b) or to lead the clean liquid into a container b
with float valve r
F1
. The pump primes the
operating liquid B out of this container (illustr.
5b). The level of the liquid should be in the
middle of the shaft.
In case the gas and the liquid have not to be
discharged separately, a liquid separator may
be omitted. It would then be sufficient to install
a pipe I
D
, leading to a discharge sink.
5.5.4 Execution with gas ejector
In order to achieve certain operating points the
vacuum pump will be provided with a gas
ejector pump.
5.6
Setting up of the unit
A side mounted liquid separator has to be
installed thus that the liquid discharge is at the
same level as the shaft.
The liquid separator is mounted to the dis-
charge nozzle of the pump. Select an appro-
priate operating mode such that as little fresh
liquid as possible is needed.
Setting up schema
Descriptions to illustrations 3a – 5c
A waste liquid
B operating liquid
F clean liquid
K cooling liquid
T expanding agent
U circulating liquid
N liquid level
S medium suction side
D medium discharge side
P liquid ring vacuum pump
P
B
circulating pump
a liquid separator
b clean liquid container
g gas ejector pump
h ventilating device
w heat exchanger
V
F
shut-off valve
V
K
shut-off valve
V
S
non-return valve
r
B
regulating valve
r
F
regulating valve
r
F1
regulating valve (float valve)
r
F2
regulating valve (thermostatic)
r
F3
regulating valve (reducing regulator)
I
B
pipe for operating liquid
I
F
pipe for clean liquid
I
G
pipe for cavitation protection
I
K
pipe for cooling liquid
I
S
suction pipe
I
D
discharge pipe
I
U
circulating pipe
m
B
Mano vacuum meter
m
D
manometer A discharge liquid
m
t
thermometer
m
t1
temperature probe to r
F2
U
A
liquid discharge
U
B
connection for operating liquid
U
N
connection for control valve
U
S
connection for suction pipe
U
D
connection for discharge pipe
U
U
connection for circulating liquid
U
e
discharge
U
se
connection for draining pipe
U
L
connection for ventilation device