WORKING PRINCIPLE
The MJDW series are self-primng centrifugal pumps
suitable for suction from deep wells.Self-priming is achieved
using an ejector,housed in the jet body,which can be installed
directly on the pump body (only for 4 ejector) or more often
lowered in a well and connected to the pump body by two pipes.
The total delivery produced by the closed centrifugal impeller
is sent only partly to the delivery opening.The
remaining(driving)water is recirculated the pump body by two
pipes.The total delivery suction chamber where it generates
the necessary vacuum to the delivery opening.The remaining
(driving)water is recirculated through the e jector,which is
conncted to the diffuser with recirculating water from the
pump,thus increasing its pressure at the expense of the
recirculating water ,and is drawn into the pump through the
suction pipe.
When the jet body is directly installed on
the pump body(only for 4"ejector) the MJDW series works like the MJSW series.
PUMP INSTALLATION AND
APPLICATIONS
These pumps are suitable for pumping
clean water and fluids which are not chemically aggressive to
the pump components.
The MJDW series installed above ground
with the jet body submerged guarantees functioning even when
the static level of the well falls as far as 45 meter below
the level of the installed pump.For this reason these pumps
are extremely reliable, economical and simple to use and find
many usesin domestic applications and the automatic
distribution of water from small and medium-sized surge tanks,
watering gardens,etc.In all cases where the suction depth
exceeds the normal capacity (9 meters) for surface pumps.
Always install a retention valve on the jet body opening.It is
advisable to install a valve on the pump delivery opening,to
ensure adequate counter pressure.when working.Fill the pump
body and the piping connecting the pump to the jet body with
water before starting up.Only 4 ejector can be installed
directy onto the pump body.In this case,when first staring up
fill thepump body with water,without bothering to fill the
suction piping.
These pumps should be installed in a
covered area,protected agains the weather.
PERFORMANCE
The wide range of pumps in
the MJDW series satisfies the most varied
requirements with features such as:
¡ù high heads compared
required power leves;
¡ù high tolerance of the presence of
entrained air in the fluid to be pumped;
¡ù suction depth
down to 45 meters in installations with submerged jet
systems.
In order to enhance performance in installations
with different suction depths and well diameters.pumps can be
supplied with:
¡ù 3different ejectors for depths down to
15m(P10) ,20m(P20) and 45m(P30) for 4?wells;
¡ù ejector for
depths down to 45m and 2"wells.
STRUCTURAL CHARACTERISTICS
¡ù cast iron
pump body,
¡ù cast iron jet body.
¡ù brass impeller with
centrifugal radial flow type(technopolymer on request).
¡ù
stainless steel shaft
¡ù stamles steel mechaaical seal
(graphite to SiC).
¡ù with thermal overload protector in
single phase motor
¡ù protection IP44.
¡ù NSK bearing or
local bearing
WARRANTY:1 YEAR(according to our general sales
conditions)
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