Fig. 5: Flexible pressure pipeline connection
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Installation and operating instructions Liftson L
7.3 Connecting the pipes
All pipes must be installed so they are stress-free, noise-insulated and flexible. No pipeline
forces or torques may act on the unit. The pipes (incl. valves) are to be fastened and sup-
ported such that neither tensile nor compressive forces act on the unit.
All line connections must be made with care. Carefully tighten any connections with hose
clips (tightening torque 5 Nm!).
Do not reduce the pipe diameter in the direction of flow.
In the inlet pipe in front of the tank as well as after the non-return valve, a gate valve is
always necessary in accordance with EN 12056-4 (Fig. 10).
7.3.1 Pressure pipeline
CAUTION! Risk of damage!
Occurring pressure surges (e.g. when closing the non-return valve) can sometimes be
several times more than the pump pressure, depending on the operating conditions (to
avoid this, see also sect. 8.2.2 "Setting the pump run time").
• Therefore, in addition to the corresponding pressure resistance, also pay attention to
the longitudinal force fit connection elements of the pipe.
• The pressure pipeline with all installed parts must reliably withstand the occurring
operating pressures.
• Avoid relatively long horizontal pipe sections, since they favour fluid hammer on the
non-return valves and thus dangerous pressure peaks that may exceed the permissible
value and thus present a risk to the system and the pressure pipe. If they are unavoid-
able, appropriate measures shall be taken onsite (e.g. additional valve with counter-
weight, run-on time of the pumps).
To protect against any backflow out of the main public sewer, the pressure pipeline is to
be designed as a "pipe loop", the bottom edge of which must lie at the highest point above
the locally defined backflow level (usually at street level) (see also Fig. 10).
The discharge pipeline is to be installed so that it is frost-proof.
Mount the gate valve (DN 80) to the pressure connection of the unit (available as an acces-
sory, nuts, washers, flat gasket included). Support the weight of the valves.
CAUTION! Risk of damage!
Using other valves than those from the Salmson accessories can lead to malfunctions
or damage to the product.
Afterwards, connect the pressure pipeline directly to the gate valve (flange piece, flexible
hose section, flat gasket and connection elements included).
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7.3.2 Inlet ports
Install the inlet pipes so that they can run empty by themselves.
Main inlet DN 100/DN 150
Only insert the main inlet pipe (DN 100 or DN 150) in the tank at the marked surfaces.
To avoid the transfer of forces and vibrations
between the unit and the pressure pipeline, the
connection should be flexible. Also, keep a dis-
tance between the flange piece and the pressure
pipe (Fig. 5).
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Pressure pipe
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Hose sleeve
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Flange piece
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Keep a distance of approx. 40-60 mm
English
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