Richter SCK-S - Manual (Page 5)

Series MNK-S, MNK-SB, SCK-S, “Self-priming“ design Page 5
9230-062-en Revision 02
TM 6566 Edition 08/2006
1.2 Tightening torques
Screws lubricated, tighten in diametrically opposite
sequence
Volute housing hex. screws 901/22
No. x size Nm
24 x M 10 40
Feed elbow hex. screws 901/20
No. x size Nm
8 x M 12 40
Draining cover hex. screws 901/21
No. x size Nm
8 x M 10 20
Blind cover stud screws 902/1
No. x size Nm
8 x M 10 20
1.3 Type plate
The stainless steel type plate is firmly riveted to the
housing:
If the operator attaches his identification, it must be
ensured that the pump matches the application in
question.
Example of type plate:
2 Safety, transport, storage and disposal
As regards safety, transport, storage and disposal, the
relevant chapters in the adjacent installation and op-
erating manuals apply. This supplementary installation and operating
manual is only valid in conjunction with the following
installation and operating manuals, depending on the
design selected:
MNK
long-life grease lubrication 9230-050-en
MNK oil bath lubrication 9230-051-en
MNK-B close-coupled design 9230-055-en
SCK long-life grease lubrication 9220-050-en
SCK oil bath lubrication 9220-055-en
3 Product description
In contrast to normal-priming centrifugal pumps, the
self-priming pump is able to vent its suction line itself.
It produces a vacuum in the suction line and so the
medium is drawn in until finally the entire suction line
is full and conveyance of the medium can commence.
Here, it must be ensured that the maximum geodetic
suction lift and the maximum geodetic back pres-
sure are not exceeded and that the vapour pressure
of the medium in the pump is not undershot during
the venting process.
The housing of the self-priming pump can be seen in
the sectional drawing in Section 8.1. 3.1 Mode of operation
Before it is switched on, the pump must be filled at
least up to the lower edge of the suction nozzle.
After the pump has been switched on, the liquid in
the feed elbow is conveyed by the impeller through
the volute housing into the pump housing.
Driven by the pressure generated by the impeller,
the medium is injected from here through the valve
seat back into the impeller again.
This jet of medium passes over the inlet openings of
the vanes of the rotating impeller and so air pockets
are produced by the medium in the vanes. The im-
peller vanes are thus flushed with medium, which is
why this venting principle is also called the impeller
vane flushing method.