GA 02.200/8.02 - 10/02
Description
3
1 Description
1.1 Design and Principle of
Operation
The E series comprises single-stage rotary piston
pumps, and the DK series consists of two-stage rotary
piston pumps. Their pumping capacity ranges from 200
to 250 m
3
· h
-1
.
E and DK series pumps can pump gases and vapours
and evacuate vessels or vacuum systems in the medium
vacuum range.Those of standard design are not suitable
for pumping higher than atmospheric concentrations of
oxygen or extremely aggressive or corrosive media.
1.1.1 Principle of Operation
In the pump body (2/14), the piston (2/1) is guided by the
eccentrically mounted cam (2/2) along the wall of the
pumping chamber, without contacting it. The piston divi-
des the chamber into two sections that change in size.
The piston has a hollow neck (2/11) with a slot on the
side.
The gas being pumped comes through the inlet port
(2/10) into the piston neck.
When the slot in the piston neck is opened by the slide
valve (2/12), the gas flows into the expanding section of
the pumping chamber (right-hand section in Fig. 2). The
gas is encapsulated in the pumping chamber, then com-
pressed during the next revolution of the piston (left-hand
section in Fig. 2) and expelled at the exhaust valve (2/5).
Fig. 1 Rotary Piston Pump E 250
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