Date: 23/02/2021
5 of 7
Subject to change without notice
Fig. 1
Components of the duplex filter
Pos.
Description
Pos.
Description
Pos.
Description
1
Drain screw
6
Clamp (F101D)
11
Seal
2
Housing
7
Hexagon nut (F101D)
12
Hexagon nuts (F101DS)
3
Strainer insert
8
Hexagon head bolt (F101D)
13
Studs (F101DS)
4
Cover
9
Change-over lever
14
N1 Inlet
5
Vent valve
10
Stopcock plug
15
N2 Outlet
Table 2
Components of the duplex filter
Operating principle and function
The medium flows through the upper connection N1 inlet (14) into the duplex filter.
The medium flows through the strainer insert from the inside to the outside.
The cleaned medium leaves the duplex filter through the lower connection elbow N2 outlet (15).
Start-up
It must be ensured that all connecting and locking elements are correctly installed and firmly tightened before start-up.
Initial condition for the start-up: All valves (inlet, outlet and vent valves) are closed.
1.
Bring the Change-over lever into the operating position (in the direction of the filter bowl to be put into operation).
2.
Open the vent valve.
3.
Open the inlet valve slowly.
Avoid sudden opening as this may damage the filter housing and strainer insert.
4.
Close the vent valve as soon as the medium discharges (in the case of dangerous or aggressive liquids, appropriate
measures must be taken to prevent spraying out).
5.
Check the entire system for possible leaks under pressure load. Rectify leaks if necessary. In the event of leaks:
a)
Shut off the inlet.
b)
Carefully relieve the pressure via the bleed or drain screw.
c)
Empty the duplex filter.
d)
Check the duplex filter for damaged parts.
e)
Repeat the start-up procedure.
6.
Open the outlet valve slowly to avoid pressure surges.
7.
Adjust the desired throughput slowly.
5
Operation
Flow through the duplex filter as evenly as possible. Pressure surges, intermittent pumping and interruption of the flow can result
in damage to the strainer inserts used.
Check the duplex filter at regular intervals. The following should be noted:
1.
Vent the duplex filter at regular intervals.
Air pockets in the filter can render part of the filter surface ineffective.
2.
Check the duplex filter regularly for leaks.
3.
Check the operating pressure and the operating temperature regularly.
4.
Check the current differential pressure / degree of soiling of the strainer insert regularly.
If this is within the range of the maximum value specified by the owner for replacement or cleaning, the filter must be taken out of
service and serviced.
(13)
(6)
(4)
(3)
Filter A
Filter B
(5)
(2)
(1)
(7)
(8)
(11)
(10)
(14)
(9)
(12)
(15)
