Astralpool 21257 Manuel D'installation Et D'entretien page 3

If not all the outlets of the valve are necessary, never cover any of the outlets as the valve will stop working. In these
cases, join 2 or more outlets to feed one branch installing them alternatively, never adjacent. It is recommended to
install them as indicated in Fig. 2.
If the installation requires more than 6 outlets, several valves can be combined in parallel at the outlet of the pump,
ensuring that the minimum required flow of 10m3/h reaches each valve (Fig. 3).
The total surface area of the nozzle outlet of each branch should be similar to maintain the pressure and flow in the
different branches.
It is advisable to place the configuration S1 of the nozzle on the upper step of the ladder to avoid splashing (Fig. 4).
Choosing the pump
For optimum operation of the system, it is important to correctly configure the nozzles and install the correct pump.
To choose a pump, you need to know the flow required for each nozzle and pressure drops of the installation.
The following table shows the optimum flows for each nozzle outlet configuration to ensure the system works
properly. For further details see the action radius graph in Fig. 5.
Output Combination
S1
S2
S3
S4
Once you know the flow required, you must find out the pressure drop. The pressure drop of the nozzles and
distributor valve can be found in figures 6 and 7.
These 2 parameters, required flow and pressure, are sufficient to search for the correct pump in a graph or table.
The final result should meet the working specifications of the valve indicated in the following table.
Flow (m
Inside valve pressure (bars)
For general use, in 2-nozzle branches, place outlet S4 with a total flow of 10m
outlet S4 with a total flow of 15m3/h.
Details of pressure drops of the installation:
Nozzles Configuration
per of nozzle
branch outlet
2 S4
3 S4
* Guidance values. Use as an example only for simple installation pools and with a distributor valve near the pool.
It is recommended to calculate this value in each installation.
Summary table to choose the pump:
Nozzles per branch
* Guidance values. Use as an example only for simple installation pools and with a distributor valve near the pool.
It is recommended to calculate this value in each installation.
Flow x nozzle m
B+D 2
A+D 3
B+C 4
A+C 5
3
/h)
Flow m3/h
Nozzle Branch
5 10
5 15
Nozzle
outlet
2
3
3
/h Cleaning length in m.
0,50
1,00
1,50
1,80
Minimum
10
0.5
Pressure drop (mca)
Nozzle Valve
6.5 1.8
6.5 6
3
Flow (m /h)
S4 10
S4 15
3
Output surface mm²
50
100
150
200
Maximum
15
1.4
3
/h and in 3-nozzle branches, place
Remaining
Total
installation
4.7 *
5.5 *
Pump pressure
(mca)
13 *
18 *
13
18