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Features:
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Gas Seal Mechanism |
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The gas seal mechanism
prevents contamination inside the pump chamber by sealing has produced
from the chemical within the pump. This mechanism also places a dry
seal made of rubber in the shaft to protect the motor and the atmosphere
of an operational environment.
During operation, the tip of the dry seal lip moves by centrifugal
force, and rotates without contact. At the same time, it prevents
the leakage of gas and the lip closely adheres during stop to seal
gas. Moreover, any leaked gas is immediately released by ventilation,
and the oil seal firmly guards the motor bearing. In this way, the
service life of the pump and operation environment is protected from
gas contamination by the triple gas seal mechanism. |
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Resistance to Chemicals |
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The main body of DRYFREE is composed of a
carbon fiber reinforced polypropylene (CFR PP) resin, which resists
corrosion from a wide range of chemicals. It is also constructed keep
metallic parts from contacting the liquid. This unique design combined
with the resin construction enables the pump to withstand a much wider
range of chemicals than conventional vertical pumps. |
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Resistance to Heat |
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CFR PP is not only resistant to corrosion
but is also resistant to heat. DRYFREE, which uses this resin for
the main body, stands out as an excellent heat-resisting performance
pump among the high corrosion resisting chemical pumps. |
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Sealless Construction |
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The key to sealing liquid in a pump
without incorporating a seal in the liquid that passes inside
the pump and the impeller construction. We have successfully
developed "Liquid Seal" by utilizing viscosity, pressure
and frictional resistance of the liquid, and by balancing the
pressure with the unique impeller construction.
The impeller construction is designed
so that the pumping blades are located on the front of the impeller
main plate, seal blades on the rear, and the protrusion rings
on the outside of the seal blades. In addition, the outside
diameter of the impeller main plate is larger than the diameter
of the protrusion rings. The liquid, which moves to the shaft
by the internal pressure during operation, is stopped by pressure
in the opposite direction of the protrusion ring and seal blade,
and works as liquid seal. When a great resistance is applied
on the suction side, air is liable to be sucked from the axial
direction. However, liquid frictional resistance is produced
between the pressure-balanced liquid and the impeller main plate,
the protrusion ring and casing fixed, wall, which prevents air
from being sucked to obtain a high vacuum. |
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Reducing Air Entrapment and Improving
Suction Performance |
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The problem of "air lock",
liable to conventional sealless pumps, has been successfully
solved in the DRYFREE through the adoption of a new impeller
design. First, minimizing the size of the seal blade has reduced
the loss resistance. Second, providing barrier walls such as
protrusion rings have further reduced air entrapment. This new
construction is useful in increasing the airtightness within
the pump, and in improving stable suction performance.
The new construction has other additional advantages. It is
capable of pumping high temperature fluids that were difficult
to pump because of maximum vapor tension, and can cope with
suction side piping that has great loss resistance. |
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Strong Against Dry Running |
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Constructed without parts
such as mechanical seal and bushing, DRYFREE will not generate
heat when it runs dry. The pump has no consumable parts and
is even capable of handling small amounts of slurry. |
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