Design and function
Diaphragm pump N87.9 EX
16
Translation of Original Operation and Installation Instruction, english, KNF 323252 04/21
Function of a diaphragm pump
1
Outlet valve
2
Inlet valve
3
Transfer chamber
4
Diaphragm
5
Eccentric
6
Connecting rod
2
1
4
3
6
5
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 pumping chamber
(3) is separated from the pump drive by the diaphragm.
