Diaphragm liquid pump NF 25, NFB 25
Assembly and function
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions
9
5. Assembly and function
Assembly
1
Outlet
2
Inlet
3
Connecting plate
4
Drive
5
Connecting leads
6
Head plate
7
Intermediate plate
Fig. 1: Micro diaphragm liquid pump NF 25
1
Outlet valve
2
Inlet valve
3
Working chamber
4
Diaphragm
5
Eccentric
6
Connecting rod
7
Pump drive
Fig. 2: Pump assembly
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
).
NFB 25 Version
(double-headed pump, see Fig. 3)
This pump type has two NF25 pump heads that can be operated
individually or in parallel connection (see Chapter 0).
Fig. 3 : NFB 25
(double-headed pump)
