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Translation of the original instructions with installation instructions Pi 370 / Pi 3700, Filtration Group GmbH, 28.06.2020, Mat. No. 72412144, Version 06
6.2 Main components of the duplex filter
Fig. 2:
Diagram of the main components
1 Maintenance indicator (optional)
2 Vent screw (filter 1)
3 Inlet
4 Filter head
5 Switch-over handle with integrated pressure
compensation lever and safety catch
6 Filter housing (filter 1)
7 Drain plug on dirty side (filter 1)
(standard with NG 250, 300, 400 and 450, optional
with NG 40 - 160)
8 Drain plug on dirty side (filter 2)
(standard with NG 250, 300, 400 and 450, optional
with NG 40 - 160)
9 Filter housing (filter 2)
10 Outlet
11 Vent screw (filter 2)
12 Filter element (filter 1)
13 Filter element (filter 2)
6.3 Operating principle of the duplex filter
Fig. 3:
Operating principle
1
Dirty fluid flows in through the inlet.
2
The medium is guided to the left or right filter side,
depending on the position of the switch-over handle. The
lever position indicates the non-operational filter side.
3
The fluid flows through the filter element to the clean side.
4
The filtered fluid exits the duplex filter via the outlet.
5
When a maximum differential pressure is reached, the
switch-over handle must be shifted to the other side and
the dirty filter element replaced with a new FG element.
Wire cloth elements* can be cleaned (refer to
section 13.6).All other elements must be exchanged and
disposed of correctly.
The filtration process does not need to be interrupted.
Optional
If a maintenance indicator is used, a signal is output when
the maximum differential pressure is reached.
* Wire cloth filter elements are not used to filter fuels in
maritime applications. Section 13.6 is only relevant if you
are using wire cloth elements!
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