en – Original Instructions
e-SHE, e-SHS
– Additional Installation, Operation and Maintenance Instructions 21
Figure 4: Suction lift installation
1. Pump unit
2. Anti-vibration joint
3. Overpressure safety on-off valve
4. On-off valve
5. Pressure gauge
6. Check valve
7. Electrode probes or float
8. Automatic relief valve
9. Foot check valve with filter
10. Electric panel
11. Filling on-off valve.
General guidelines
1. Refer to the hydraulic diagrams.
2. Do not install the unit at the lowest point of the system, to avoid the accumulation of
sediments.
3. Support the pipes independently to prevent them from weighing on the unit.
4. Fit dampers between the unit and the surface on which it is installed, to reduce the
transmission of vibrations from the unit to the system and vice versa.
5. Remove any welding residues, deposits and impurities in the pipes that could damage the
unit; install a filter if necessary.
6. Install an automatic relief valve at the highest point of the system to eliminate air bubbles.
Guidelines for the suction side
To reduce flow resistance, the piping must be:
• As short and as straight as possible
• For the section connected to the unit, straight and without bottlenecks, covering a
length equal to at least six times the diameter of the suction port
• Wider than the suction port; if necessary, install an eccentric reducer that is horizontal on
top
• Without bends; if this cannot be avoided, bends of a radius as wide as possible
• Without traps and 'goosenecks'
• With on-off valves with a low specific flow resistance.
In addition:
1. Install a device to prevent the absence of liquid, for example a float or probes, or a
minimum pressure device.
2. Submerge the end of the pipe in the liquid, in order to prevent any air from penetrating
through the suction vortex when the level is at the minimum
3. In case of positive suction head installation, install a pressure gauge
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