Diaphragm pump N922 EX
Design and function
Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19
15
5 Design and function
Design
1
Pump outlet
2
Pump inlet
3
Pump head
4
Motor
5
Capacitor (only capaci-
tor motor)
6
Terminal box
7
Adjustment valve for
flow rate (only .29 ver-
sions)
Fig. 1 Design N922.29 EX
Function of a diaphragm pump
1
Outlet valve
2
Inlet valve
3
Transfer chamber
4
Diaphragm
5
Eccentric
6
Connecting rod
7
Pump drive
Fig. 2 Function of a diaphragm pump
Diaphragm pumps transfer, compress (depending on the version) and evacu-
ate gases and vapors.
The elastic diaphragm (4) is moved up and down by the eccentric (5) and the
connecting rod (6). In the downwards stroke, it aspirates the gas to be trans-
ferred via the inlet valve (2). In the upwards stroke, the diaphragm presses the
medium out of the pump head via the outlet valve (1). The transfer chamber
(3) is hermetically separated from the pump drive (7) by the diaphragm.
