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Overview:
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Material: CFR PP //
- Sealless Construction //
- Reducing air entrapment and improving suction performance //
- Triple gas seal mechanism //
- Ressitance to wide range of chemicals //
- Resistnace to heat
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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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Examples of Use:
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Parts Description & Dimensional Drawing:
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