- MAGDOS DE/DX
- MAGDOS LC
- MAGDOS LT
- MEMDOS MR
- MEMDOS GMR
- Model 1210
- Model 1270
- Model 1710
- Model 1730
- Model 1740
- Model 5701
- Model 5710
- Model 5720
- Model 5730
Double diaphragm metering pumps of the MEMDOS
GMR series can be supplied as single or duplex metering
pumps. The pumps are used to meter large quantities
at relatively low back pressures. They are frequently
used in waste-water treatment to meter pH-regulating
chemicals or flocculents.
The metering pumps are available in three sizes as single
metering pumps for 2000 to 4000 l/h. Different metering
heads can be connected to the duplex metering pumps.
The metering heads are then operating in a reciprocating
mode and the quantity
metered is set for both heads at the same time.
Standard designs are: Single metering pump with lefthand
metering head arangement. Type designation GMR Symbol
Duplex metering pumps with two metering heads. Type
designation ZGMR Symbol
The characteristic feature is the duplex diaphragm (7+8).
The eccentric (5) guides the diaphragm (7) almost following
the sine wave over the constant stroke. Since the large
supporting disks always carry the whole surface of the
diaphragm (7) in the maximum eccentric positions, a
piston-like displacement effect is achieved. This results
in a very high metering accuracy for diaphragm metering
pumps independent of the back pressure.
The front supporting disk for the suction stroke must
not get into touch with the medium because of chemical
resistance and the possible abrasivity. Therefore, a
second diaphragm (8) is provided, which has a merely
separating function and is therefore neutral in respect
to forces. The medium side of the EPDM separating diaphragm
(8) is coated with PTFE.
A precisely dimensioned glycerin filling (6) acts as
hydraulic push rod and thus the distance between the
two diaphragms remains constant. Also the rear diaphragm
chamber is partly filled with glycerin for
lubrication purposes. The suction (12) and discharge
valves (13) are single-ball valves. The suction (11)
and discharge connections (10) are available in plastic
or stainless steel design.