5
Please observe the illustrations, too, which are contained as an attachment at the
end of the present operating instructions. The numeric and other details included
in brackets below refer to these illustrations.
5.2.
Installation of the suction line
The intake of the suction line has to be equipped with a check valve (or
non-return valve) and an intake filter (Fig. 2).
Please use a suction line (2) having the same diameter as the
suction port (1) of the pump. If the suction height (HA) exceeds
4 m, however, it is recommendable to use a 25% larger diame-
ter - including appropriate reducer elements for the connectors.
The intake of the suction line has to be equipped with a check
valve (3) - or non-return valve - and an intake filter (4) (Fig.2).
The filter will keep away larger dirt particles contained in the
water which might clog or even damage the piping. The check
valve will prevent the pressure to escape after the pump has
cut out. Moreover, it simplifies the venting of the suction line by
enabling water to be filled in. The check valve with the intake fil-
ter - i.e. the entirety of the intake section of the suction port - must be immersed
by at least 0.3 m below the surface of the liquid to be pumped (HI). This will pre-
vent air from being taken in. In addition, please ensure a sufficient distance of the
suction line from both the ground and the sides of water courses, rivers, ponds
etc in order to prevent stones, plants etc from being sucked in.
5.3.
Installation of the pressure line
The pressure line (11) conveys the liquids to be discharged from the pump to the
point of withdrawal. To avoid dynamic flow losses, one should use a pressure
line having at least the same diameter as the pressure port (5) of the pump. To
protect the pump from damage caused by pressure surges it is advisable to
equip the pressure line with a check valve (6) to be installed directly downstream
the pump outlet.
Also, to facilitate maintenance work, it is recommendable to install a shut-off cock
(7) after the pump and check valve. This is a useful feature since it can be closed
when the pump has to be dismantled and will thus prevent the pressure line from
draining to empty.
Fig.2
22
Summary of Contents for HWA 6000 EPF
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