Operating manual
AQUA S.p.A.
ENGLISH
Page 9
PDM series mechanical Diaphragm metering pumps have a spring return mechanism. Their movement is generated by an electric motor through a
gearbox which allow the rotation of an eccentric shaft that axially push a pushing rod connected to the diaphragm, thus generating the Discharge
phase and compressing the spring at the same time. While the rotation of the eccentric continues, the spring extends, letting the rod to go back to its
original position, thus generating the Suction phase. Alternative motion produced by this mechanism allows suction and discharge of the chemical
trough the liquid end with a movement so similar to a syringe piston, while the resulting action of the check valves defines the flow direction. The drive
distance of the pushing rod, and consequently the quantity of dosed chemical, can be modified through the adjustment located behind the pump body.
Theorical flow rate match with pumping part inducted volume. Actual flow rate is lower cause of the volumetric efficiency of the pump, and depends
by pump type and dimensions, liquid nature and viscosity and working pressure.
USE REST RICTI ONS
Admittable project temperature
Ta
for all pump types is comprehended between
-10 °C and +40°C.
Maximum temperature of pumped fluid depends
by the liquid end material (as well as the fluid own characteristics)
NOTE: Periodically check the respect of temperatures limits!
Motor power mentioned in the motor plate refers to operation at altitude below 1000m a.s.l. and ambient temperatures b5°C and
+40°C. In case of installation above 1000m a.s.l., motor power will decrease proportionally, as shown in the below picture:
PREDI CTED USE
PDM metering pumps are designated to liquid dosing ( ambient temperature or heated).
Any other use must be considered “IMPROPER USE” and it is not admitted.
AQUA decline any responsibility for any eventual damage.
PDM metering pumps are suitable for a
non-continuous duty 12/24 h/day
and can be used for the following applications:
-
Water and waste water treatment;
-
Pharmaceutical manufacturer;
-
Food industrial and agro industrial;
-
Paper mills;
-
Cleaning products manufacturing and dosing;
-
CIP plants;
-
Potabilization plants.
RATIONALLY PREDICT ED WRONG USE
Following uses of PDM pumps have to be considered incorrect:
