Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G
Design and Function
Translation of original Operating Instructions, English, KNF 121416-121419 07/18
11
Function diaphragm stabilization system
(only N 920 AP.18 and N 920 AP.29.18)
1
Balancing connection for
vacuum chamber
2
Vacuum chamber
3
Stabilization diaphragm
Fig. 4: Function diaphragm stabilization system
An additional diaphragm, the so-called stabilization diaphragm (
3
),
separates the underside of the working diaphragm from the “crank”
space of the pump (see fig. 4). The space between the two dia-
phragms, called a vacuum chamber (
2
), is connected with the
suction side of the pump via an balancing connection (
1
). This way,
the vacuum chamber has approximately the same pressure as the
working space of the diaphragm pump. The pressure difference
between the upper and underside of the diaphragm approaches
zero. The working diaphragm remains stable, independent of the
inlet pressure of the pump. This improves the suction speed of the
pump significantly, over its entire working range.
Summary of Contents for N920 AP.18
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