Diaphragm liquid pump NF 1.300 EX
Assembly and function
KNF Flodos AG BA_NF1.300EX_EN_05_152146
English translation of original Operating and Installation Instructions
12
5. Assembly and function
Assembly
1
Condenser
2
Outlet
3
Pump head
4
Inlet
5
Motor
6
Motor base plate
7
Pump rating plate
8
Motor rating plate
Fig. 1: Diaphragm liquid pump
1
Outlet valve
2
Inlet valve
3
Working chamber
4
Diaphragm
5
Eccentric
6
Connecting rod
7
Pump drive
Fig. 2: Operating principle
The diaphragm liquid pumps are based on reciprocating displace-
ment pump technology. The elastic diaphragm (
4
) is moved up and
down by the eccentric (
5
) and the connecting rod (
6
). In the down-
ward stroke it aspirates the medium to be transferred via the inlet
valve (
2
). In the upward stroke, the diaphragm pushes the medium
out of the pump head via the outlet valve (
1
). The diaphragm
hermetically seals off the working chamber (
3
) from the pump
drive (
7
).
NF 1.300 version (fixed flow rate)
This pump type represents this product in its simplest form and
transfers medium at the fixed flow rate.
NF 1.300 .27 version (fixed flow rate with overpressure limit-
ing)
If the diaphragm liquid pump is operating against a closed system,
the delivery pressure quickly exceeds the maximum permissible
values. To prevent this happening, an overflow valve is integrated
in the top part of the pump head. If the pressure exceeds the
variable limit range (min. 1.5 to max. 4.0 bar
g
), the valve opens
and the liquid circulates from the pressure side to the suction side
via an internal bypass system. This prevents any further rise in
pressure.
Summary of Contents for NF 1.300 EX
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