Grundfos JP Booster PT - 5 Ejector Valve; Ejector Valve Setting; Shaft Seal Run-In; 6 Start-Up

English (GB)
10
5. Ejector valve
The ejector valve is supplied separate with the
pump.
Remove the plug (V), see fig. 1, and fit the ejector
valve into the hole.
Fig. 1 Ejector valve
5.1 Ejector valve setting
The ejector valve in the plug hole (V) can be turned
to two positions. See fig. 3.
Figure 2 shows an example of how the ejector valve
position may affect the QH curve.
Fig. 2 QH curve and ejector valve positions
Pos. 1
Turn the valve to the left (out).
Select pos. 1 when the suction pipe is empty and the
pump is to be primed.
Select also pos. 1 when a small quantity of water and
a high pressure are required.
Pos. 2
Turn the valve to the right (in).
Select pos. 2 when the pump has been primed, and
a large quantity of water and a low pressure are
required.
Fig. 3 Ejector valve positions
6. Start-up
6.1 Shaft seal run-in
The seal faces are lubricated by the pumped liquid,
meaning that there may be a certain amount of
leakage from the shaft seal.
When the pump is started up for the first time, or
when a new shaft seal is installed, a certain run-in
period is required before the leakage is reduced to
an acceptable level. The time required for this
depends on the operating conditions, i.e. every time
the operating conditions change, a new run-in period
will be started.
Under normal conditions, the leaking liquid will
evaporate. As a result, no leakage will be detected.
Note
The O-ring must be fitted to the ejector
valve.
Tighten the valve using fingers only.
TM00 5495 4995TM00 7474 1396
V
S
P
T
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Q [m³/h]
0
5
10
15
20
25
30
35
40
45
H
[m]
0.00 0.25 0.50 0.75 1.00 Q [l/s]
JP 5
IS O 9906 Annex A
P
o
s
.
1
P
o
s
.
2
Pos. Ejector valve Direction
1
Left
(out)
TM04 2299 2308
2
Right
(in)
TM04 2300 2308
Caution
Do not start the pump until it has been
filled with liquid. See the quick guide.
Note
We recommend to fit a non-return valve
on the suction side of the pump.