Imovilli Pompe S.r.l.
Reggio Emilia – Italy
www.imovillipompe.it
Manuale d’officina – Pompe a membrana 5/11
6.0 Diaphragm control and replacement
6.1 For the diaphragm replacement operation,
position the pump as shown, unscrew the diaphragm
locking pin and remove the diaphragms.
After having thoroughly cleaned them, proceed to
check:
a) If they are swollen even without cuts or
tears, they must be replaced because they are
affected by the pumped products;
b) If in the upper part (the one in contact with
the product) there is a clear cut (a "U") in
correspondence with the intake valve or an
incision that coincides with the diameter of
the return washer, it is a symptom that the
pump has operated in conditions of
excessive depression (dirty or insufficient
filter, suction from more than 3 m depth,
obstructions in the suction line) that must be
checked;
c) If in the part in contact with the oil there are
cuts or circular erosions corresponding
approximately to the diameter of the piston,
it is a symptom of contact with the piston
itself and the causes can be:
- Stop and start the pump without having canceled
the pressure
- Oil leaks from segments (because they are faulty
and / or worn)
- Cylindrical scratches in the area from the supply
holes (PMI) to the edge of the cylinder, due to
debris and impurities caused by the operation of the
pump without oil
- Pump operation (at maximum pressure) with
rotation less than the minimum indicated on the
nameplate and instruction booklet.
d) IN CASE OF swelling of the membranes
even without breakages, it is advised, after
removing the cylinders, to empty the oil and
to wash with diesel or kerosene inside the
pump.
e) e) IN CASE OF breaking even one
membrane, it is necessary to completely
disassemble all the crank mechanism for an
accurate control of its components.
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