17
180R9265 / IOM APP 16-22 Appendices - v02 / 01.2013
2. System design The design of the system must ensure that
self-emptying of the pump during standstill is
avoided.
The inlet pressure of the pump must never
exceed the outlet pressure. This may typically
occur in boosted or open-ended systems with
direct water supply.
2.1 Open-ended systems with direct
water supply
The pump is supplied with water direct from a
feed pump.
In order to eliminate the risk of cavitation, a
positive inlet pressure of at least 2 bar(29 psi) is
always to be maintained, but it must not exceed
5 bar (72.5 psi) continuously.
1. Place the lter (1) in the water supply line in
front of the pump.
2. Place a monitoring pressure switch (3)
between lter and pump inlet - set at min.
2 bar (29 psi) inlet pressure. The monitoring
pressure switch must stop the pump at
pressures lower than 2 bar (29 psi ) inlet
pressure.
3. Install a low pressure safety valve or a low
pressure relief valve (4) in order to avoid
system or pump damage in case the pump
stops momentarily ( high pressure peaks )
or starts spinning backwards.
Note: If a non return valve (2) is mounted in the
inlet line, a low pressure relief valve is also
required between non return valve and pump
as protection against high pressure peaks.
Inlet
Out l et
1
2
3
PS
4
Instruction APP pump instruction APP 11-13 and APP 16-22
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