Pump; Gas Ballast - KNF SC 920G Manual De Instrucciones

Design and Function
1 Outlet valve
2 Inlet valve
3
Transfer chamber
4 Diaphragm
5
Eccentric
6 Connecting rod
7 Pump drive
Fig. 6: Gas ballast switch
16 Translation of original Operating Instructions, English, KNF 334631-334633 07/21

5.4. Pump

Design
Fig. 5: Pump design
Function Diaphragm pump
Diaphragm pumps transfer, compress (depending on pump
version) and evacuate gases and vapors.
The elastic diaphragm (4) is moved up and down by the eccentric
(5) and the connecting rod (6). In the downward stroke it aspirates
the gas to be transferred via the inlet valve (2). In the upward
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.

5.5. Gas ballast

Personal injury caused by poisoning or explosion
and damage to the pump
 Make sure that no reactive or explosive mixtures
will be produced when the gas ballast valve is
WARNING
open.
When transferring vaporous media, opening the gas ballast
valve can minimize the formation of condensation in the pump
heads.
Opening the gas ballast valve deteriorates ultimate vacuum
performance.
The gas ballast valve is opened and closed via the gas ballast
switch (see Fig. 6).
Please contact KNF Service if you require an inert connection for
the gas ballast.
Vacuum Pump System SC 920G