MPB
MNK-S, MNK-SB, SCK-S
emptying waste-water basins
Emptying with overflow
A - Filling
B - Venting
A volume of liquid in the suc-
tion line permits self-priming
with a peripheral pump.
Application example for a liquid
similar to water, 20°C. Venting
time approx. 5 minutes.
As shown in the diagram, no
additional valves are required if
it is always ensured that the
pump is not siphoned after it is
switched off. It is siphoned
when the discharge line
remains open after the pump is
switched off and the medium
column on the discharge side
can flow back through the
pump. Here, too much medium
is entrained out of the pump
housing and so the pump can
no longer be primed when
started up again! The
siphoning of the pump
can
be prevented if, after the end
of conveyance, the shut-off
valve on the discharge side is
closed first and then the pump
switched off. It is recom-
mended to switch off the pump
before air enters the suction
line, i.e. the suction line end
should always lie at the low
level of the medium.
As the diagram shows, no
additional valves are required
for the pump for emptying with
overflow. The sequence of
activation of the shut-off valve
and the start-up of the pump is
arbitrary for the
start-up and
shutdown operations.
.
2.5.5.4
Supply lines
Supply lines should vent towards the reservoir and are therefore to be laid with a constant down-
ward gradient towards the pump. Should the piping internals upstream of the pump be horizontal, a
low point can, of course, be located upstream of these internals. From here the pipe is then laid
with an upward gradient to the pump so that the gas bubbles which form here can escape through
the pump. Valves which disrupt the course of flow should not be installed directly upstream of the
pump.
Safety and installation instructions for Richter pumps
Richter Pumpen /
pumps
Installation > Piping
21
