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2 tightening torques, 3 type plate, 2 safety, transport, storage and disposal – Richter SCK-S User Manual

Page 5: 3 product description, 1 mode of operation, Tightening torques, Type plate, Mode of operation, 3product description, Series mnk-s, mnk-sb, sck-s

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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
.

This manual is related to the following products: