Diaphragm metering pumps of the MEMDOS
MR series have been developed for a broad range of applications
in metering technology. Thus they are used in the industrial
sector, in process engineering and very frequently in
water and waste water treatment.
Diaphragm metering pumps are leakproof. Standard versions
are metering pumps with the head located on the left-hand
Upon request, metering pumps with the head on the right-hand
side can be supplied.
Duplex metering pumps are available with the head combinations
shown in the following tables. The heads are arranged
The power of the motor is the same for simplex and duplex
metering pumps because the diaphragms operate in a push-pull
The heads are available in polypropylene and stainless
steel. Special materials upon request. Suction and discharge
valves are double-ball valves up to the MR 290 version;
for the bigger pumps, springloaded flat-seat valves
are used. For viscous media of 400 mPas and more, spring-loaded
single-ball valves are recommended for the suction and
the discharge side.
The opening pressure of the valve is about 0.1 bar.
The diaphragm flanges have been designed so that, in
the case of a diaphragm rupture due to wear, no chemical
can escape randomly from the pump or enter the gear.
The leakage is routed downwards through a drain pipe.
The diaphragm flanges thus function as a separating
chamber and are protected against aggressive media by
means of powdery epoxy coating. The escaping leakage
can be detected by a leakage probe causing the pump
to be stopped
The drive unit consists of an oil-filled worm gear.
The stroke is generated by an eccentric which moves
back and forth a spring-loaded plunger fixed to the
The metering stroke is achieved by the pushing force
of the eccentric, the resetting of the spring causes
the suction stroke. The stroke length is set by limiting
the plunger return by means of a manually adjustable
eccentric disk used as a stop.