KNF N963, Operating And Installation Instructions

Page: 11 / 32

Diaphragm Pump N936 Design and function
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 11
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.