SIMDOS diaphragm metering pump
Structure and operation
KNF Flodos BA_SIMDOS_EN_02_160044.docx
Translation of original operating manual
11
5. Structure and operation
5.1. Metering pump structure
1
STOP button
2
START button
3
Display
4
Control knob
5
Inlet
6
Pump head
7
Outlet
8
Power supply plug
9
External drive plug
(RC version only)
Fig. 2: Diaphragm pump
5.2. Operating principle
1
Exhaust valve
2
Inlet valve
3
Working chamber
4
Diaphragm
5
Eccentric
6
Connecting rod
7
Pump drive
Fig. 3: Pump structure
Diaphragm fluid pumps are based on reciprocating displacement
pump technology. An elastic diaphragm (
4
) is moved up and down
by the eccentric (
5
) and the connecting rod (
6
). During the down
stroke, the diaphragm sucks in the medium through the inlet valve
(
2
). During the up stroke, it forces medium out of the pump head
through the exhaust valve (
1
). The diaphragm hermetically seals
off the working chamber (
3
) from the pump drive (
7
).
SIMDOS
®
diaphragm metering pumps are fitted with a patented
drive system. The suction stroke is always driven at maximum
speed, but the exhaust process is varied according to the selected
speed, ensuring maximum possible uniformity of discharge during
the entire stroke (see Fig. 4). This results in a low-pulsation, quasi-
continuous pumping process. This is the key difference between
SIMDOS
®
metering pumps and diaphragm metering pumps with
linear magnet diaphragm drive or with conventional eccentric
diaphragm drive.
