KNF N630.12, Translation Of Original Operating And Installation Instructions

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Product description and function Diaphragm pump N630.12
18 Translation of Original Operating and Installation Instruction, english, KNF 318761-318764 02/22
Function of double diaphragm pump
1 Outlet valve
2 Inlet valve
3 Transfer chamber
4 Working diaphragm
5 Innerspace
6 Hole for pressure moni-
toring of the innerspace
(
5 )
7 Safety diaphragm
8 Eccentric
9 Connecting rod
2
1
4
3
9
8
7
5
6
Fig.4 Function principle of double diaphragm pump
Double diaphragm pumps transfer, compress (depending on the version) and
evacuate gases and vapors.
The elastic working diaphragm (4) is moved up and down by the eccentric (8)
and the connecting rod (9). In the downwards stroke, it aspirates the gas to be
transferred via the inlet valve (2). In the upwards stroke, the working di-
aphragm presses the medium out of the pump head via the outlet valve (1).
The transfer chamber (3) is separated from the pump drive by the working di-
aphragm.
Located below the working diaphragm is a second diaphragm (safety di-
aphragm (7)), which is under less mechanical stress during pump operation.
Should the working diaphragm be damaged, no gas can escape from the
pump.
The closed innerspace (5) between the two diaphragms can be monitored for
pressure change with the help of the hole(s) (6) provided for this purpose.
Damage to the working diaphragm and safety diaphragm can thereby be de-
tected immediately.