Diaphragm liquid pump NF 100
Assembly and function
KNF Flodos BA_NF100_EN_10_067676.docx
Translation of original Operating and Installation Instructions
10
5. Assembly and function
1
Outlet
2
Inlet
3
Connecting plate
4
Motor
5
Leads
6
Head plate
7
Intermediate plate
Fig. 1: Diaphragm liquid pump NF 100
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 100 version (fixed flow rate)
This pump type represents this product in its simplest form and
transfers media at the fixed flow rate.
NF 100.27 version (fixed flow rate with overpressure limiting)
If the diaphragm liquid pump is operating against a closed system,
the delivery pressure quickly exceeds the maximum permissible
value. To prevent this from happening, an overflow valve is inte-
grated in the top part of the pump head. If the pressure exceeds
the adjustable limit range (min. 1.5 to max. 6.5 bar
g
), the valve
opens and the liquid circulates from the pressure side to the suc-
tion side via an internal bypass system. This prevents any further
pressure rise.
