11
381497 USA 10-2014
APV
2.1 Reminder
The Ws+ pump, like all self priming pumps of its type, requires an initial
volume of liquid in order to form the liquid ring within the pump which is
essential for the self priming function. See below.
2.2 Installation of pump
In the standard Ws+ pump, the priming volume of liquid must be
retained either within the body of the pump or where it can circulate
back to the inlet. To this end the pump must be installed with outlet
vertically upwards and with a length of vertical pipe coupled to it.
A swan neck coupled directly to the pump's inlet prevents loss of that
priming volume down the inlet pipe. To provide space for discharged air,
any non-return valve must be mounted at least 20" downstream of the
specified length of vertical pipe. See table and Fig. 2.
Shorter pipe lengths will adversely affect the time taken for the pump to
self-prime.
Note that the pump should not be left running too long without pumping
(typically 15 minutes, but less if the pumped liquid is hot) as it gets
warm and loses priming liquid by evaporation.
Keep the number of valves, bends and T-pieces on the suction side to
an absolute minimum.
There must be sufficient space around the pump for piping and access
for maintenance.
2. Installation of the pump
20/15
30/30 44/50
Pump Ws+
0.45
0.53
0.98Priming volume gallons
20/15 30/30Pump Ws+
40"
(2" diam.)
60"
(2" diam.)
60"
(3" diam.)
or
80"
(2" diam.)
H min (Fig. 2)
44/50
Swan
neck
20”
min.
8” min.
Fig. 2: Pump installation
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