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Double
Ball - Bearing Pedestal
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The bearing pedestal
is sturdily built with the bearing-houses and is cast in one piece. Both
the bearing houses are bored in the same operation, ensuring perfect concentricity.
The casing and bearing pedestal brackets are connected by close tolerance
spigot and socket flanges.
Deep-groove
ball bearings are properly spaced to provide rigid support to the impeller.
Impeller overhang is reduced to the minimum by extending the impeller hub
quite close to the pedestal. The bearings are oil-lubricated. However,
pumps with grease-lubricated bearings can also be supplied on request.
Back repelling
vanes are provided on the impeller so that pressure on stuffing box and
leakage through gland are minimized.
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Eccentric
Locking
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The impeller is
firmly locked in position by a long threaded nut, which is held firmly
in position by an eccentric screw.
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Impeller
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It is a two/three-vane,
non-clogging enclosed type impeller with wide passage capable of carrying
soft solids and other non-string materials. Semi-open type impellers can
also be supplied on request.
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Balancing
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Hydraulic balancing
of the impeller is achieved by means of back vane which also relieves the
pressure on the stuffing box to a large extent.
In order
to ensure smooth running and freedom from vibrations, every pump impeller
is carefully balanced.
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Stuffing
Box
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The stuffing box
is of versatile design, open to many adaptations to meet varying service
conditions.
The gland
packing is normally grease-lubricated. However, it can be fed easily with
pressurised run-through water. Water can be injected through the hole where
the grease pipe is normally connected and water can be taken-off from the
opposite side. This is especially useful when pump is required to handle
hot liquids.
If so desired,
externally pressurized water lubrication can be provided.
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