Swing Piston Pumps NPK 25
Design and function
Translation of original Operating and Installation Instructions, english, KNF 121581-121584 08/16
7
5. Design and function
Design
1
Pneumatical outlet
2
Pneumatical inlet
3
Front fan cover
4
Pump housing
5
Base plate
6
Motor
Fig. 1: Swing piston compressor and vacuum pump NPK 25 AC
Function
1
Inlet valve
2
Outlet valve
3
Transfer chamber
4
Retainer plate
5
Piston seal
6
Eccentric
7
Connecting rod
8
Compressor housing
Fig. 2: Function of swing piston pump
The pumps transfer, compress and evacuate air.
The swing piston, consisting of retainer plate (
4
) and piston seal
(
5
), is moved up and down by the eccentric (
6
) and the connecting
rod (
7
). In the downward stroke the swing piston aspirates the
medium to be transferred via the inlet valve (
1
). In the upward
stroke, the swing piston presses the medium out of the pump head
via the outlet valve (
2
). The swing piston is sealed off from the
compressor housing by a piston seal (
5
) and operates oil-free.
