Alfa Laval MMPX 303SGP-11, Руководство пользователя

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3.2 Design and function 3 Separator Basics
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Clarifier disc
In the clarification mode, the gravity disc is
replaced by a clarifier disc which seals off the
water outlet. In this case no water seal is required
and consequently there is no oil/water interface in
the bowl. The clarifier disc is an optional disc with
a hole diameter of 40 mm. This disc is not shown
in the nomograms.
3.2.5 Sludge discharge function
Sludge is discharged through a number of ports
(L) in the bowl wall. Between discharges these
ports are covered by the sliding bowl bottom (M),
which forms an internal bottom in the separating
space of the bowl. The sliding bowl bottom is
pressed upwards against a sealing ring (m) by
force of the closing water underneath.
The sliding bowl bottom is operated hydraulically
by means of operating water supplied to the
discharge mechanism from an external
freshwater line. Opening water is supplied directly
to the operating system in the bowl while closing
water is supplied to the built-in closing water tank,
and pumped to the operating system through the
bowl spindle.
The opening and closing only takes a fraction of a
second, therefore the discharge volume is limited
to a certain percentage of the bowl volume. This
action is achieved by the closing water filling
space above the upper distributor ring and
pushing the sliding bowl bottom upwards.
Simultaneously, the water in the chamber below
the operating slide is drained off through the
nozzles in the bowl body.
G
0
11
2
4
11
Sludge discharge mechanism
L Sludge
ports
M Sliding bowl bottom
m Sealing ring
N Upper distributing ring
O Operating slide
P Lower distributing ring
R Bowl body
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