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Vacuum prime
pumps are units which use a vacuum pump to accelerate
priming: the initial phase of pumping during which air
is removed from the suction line to draw liquid into the
pump. They are also called "dry prime" units, in that it
is not necessary to fill the pump casing with liquid.
Vacuum prime units can also easily handle large
quantities of air mixed with water during pumping, for
example when using wellpoint systems or during
dewatering of trenches on "snore".
The patented "Duo"
system enables two pumps, one for water and the other
for air, to work together in harmony, separating the
elements at the suction port of the unit so that they
can follow different paths. It can easily handle solids
in suspension in the pumped liquid.
Duo is the fruit
of over 50 years experience in designing, manufacturing
and operating contractors' pumps, and offers real
advantages for construction companies, their personnel
and the general public.
Duo vacuum prime pumps open
up a new era in the relationship between the workplace
and the environment, reducing the environmental impact
of civil engineering and construction sites while
offering considerable savings in operating
costs. |
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V
series internal gear rotary pumps are suitable
for pumping liquids of any viscosity. Solids cannot be
handled, but the pumps can cope with abrasive particles.
The vast range of fields of application includes:
Chemicals:
solvents, acids, alkalis, alcohols,
pharmaceuticals, isocyanate, polyol, sodium
silicate
Petroleum
products: gasoline, diesel fuel, fuel oil,
lubricating oil, additives, crude oil
Soap
and detergents: surfactants, personal hygiene products,
liquid detergents
Adhesives:
glue, epoxy resins
Paint
and ink: varnish, coatings, printing
ink
Pulp
and paper: liquor, coatings, lye
High
temperature liquids: bitumen, tar, asphalt, heat transfer
liquids
Foodstuffs:
molasses, chocolate, cocoa butter, glucose,
animal feed, vegetable oils, fat.
WORKING
PRINCIPLE
V pumps are internal gear positive
displacement rotary pumps. The flow is
generated by two gears: the rotor and idler,
one inside the other, separed by a crescent. As the
gears rotate, liquid is drawn into the spaces created
between the gears and the crescent. When the gears
mesh,the liquid is forced out of the pump. The result
are a smooth flow of liquid and high capacity combined
with compact size. |
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Heavy duty
casing in ductile iron, steel or stainless steel with
flanged ports.
Casing with optional integral heating
jacket available for ductile iron versions.
Rotor and
idler gears in ductile iron or stainless
steel.
Anti-galling surface treatment for versions
for solvents. Bushes in cast iron, bronze, graphite or
tungsten carbide.
Packed gland (SP) or single
(ST4,ST5,ST6) or double (ST8) mechanical seal.
Shaft
and idler pin in hardened steel or stainless
steel.
Large bearings absorb axial and radial thrust.
Lock rings for precise rotor positioning even when the
pump is installed.
Optional
heating (+R1) or flushing of the packed gland (SP1)
available on many models.
By-pass relief valve (+Y)
mounted on the pump available on request
(advisable)Heated (+YR) or double (+YY) by-pass relief
valves available for some models
The pumps
can be certified in accordance with the ATEX
standards. |
