A
rot
or is the metal corkscrew looking item that
rot
ates inside the stator.
A
stat
or is the
stat
ionary part that the rotor rotates inside.
Stator Adjustment / Replacement
The
stator
allow
s
the tightening of some bolts to squeeze together two flanges, which in turn reduce the
diameter of the inside of the stator allowing a tighter fit around the rotor giving renewed ability to
produce higher pressures, similar to when the unit was new.
The procedure for tightening stator bolts can
be found in the
pre operation pressure test
manual.
Additionally, a step by step procedure for replacing
the rotor-stator can be found there as well.
Wear issues
Never run the rotor-stator dry.
A screw pump can only work reliably if there is adequate and appropriate lubrication. The lubricant
reduces the friction between the rotor and the stator. If this lubricating film is damaged, high temperatures
are reached and the elastomer wears within a very short time. Even if dry running lasts only a few seconds
with new parts, the effect resembles that of a wheel spin on a car tire, dramatically affecting length of
service.
The use of simple dish soap or specific water based lubricants mixed with water whilst hose cleaning or
pump priming can dramatically reduce the negative effects of dry running and help prolong the natural life
of the rotor and stator.
Please note -
Rotor stator wear is directly related to the amount of work that the unit has to perform. A
low-pressure job with a smooth mix will cause less wear than a high-pressure job with smooth mix. A low-
pressure job with a course mix will wear more than a low-pressure job with a smooth mix.
The life of a rotor stator combo will need to be determined on a job-by-job basis, being dependent upon the
coarseness of the mix and the amount of pressure required.
ROTOR AND STATOR PUMP ADJUSTMENTS
Refer to the Pre Operations Pressure Test Manual for information on adjusting or replacing the rotor-stator.
EZG Manufacturing 1-800-417-9272
www.ezgmfg.com
Rev000 5/24/2022 25
