4 Description of the pump
Operating manual mzr-2509 Ex/ mzr-2909 Ex / mzr-4609 Ex / mzr-7209 Ex
Last update: October 2016
Technische Änderungen ohne Vorankündigung vorbehalten.
23
4.2
Construction
The micro annular gear pumps mzr-2509 Ex, mzr-2909 Ex, mzr-4609 Ex and
mzr-7209 Ex consist out pump head, coupling assembly and motor with cable
gland. The micro annular gear pump has a bracket to the simple fastening.
cable gland
motor
bracket
coupling assembly
pump head
outlet
inlet
figure 13
Design of the micro annular gear pumps mzr-2909 Ex and mzr-4609 Ex (mzr-7209 Ex similar illustration)
4.3
Materials and liquids
Wetted parts
mzr-2909 Ex, mzr-4609 Ex
mzr-7209 Ex
Pump housing
stainless steel 316 L (1.4404, 1.4435) stainless steel 316 L (1.4404, 1.4435)
Rotors, shaft, bearing
tungsten carbide Ni-based
tungsten carbide Ni-based
Shaft sealing
graphite-reinforced PTFE,
316L spring
graphite-reinforced PTFE,
316L spring
Static sealing
FKM,
optional: EPDM, FFKM
FKM,
optional: EPDM, FFKM
table 10
Construction materials of the wetted parts
!
The liquid resistance of the materials has to be checked and guaranteeing
before the operation by the operator.
The liquid resistance has to be checked in every individual case. The feeding of
non-lubricant liquids reduces the service life of the micro annular gear pump.
This is also true for liquids containing particles.