2.09 TEMPERATURE-CONTROL
JACKETS
Pumps are available with an optional
jacketed end cover (Pumps without end
cover pressure relief valve fitted), pump
head jackets fitted to top and bottom of
endcover (can be used with end cover
pressure relief valve) or jackets fitted to the
sides of the rotor case (Hy~Line pumps
only). These allow hot or chilled water, hot
oil or steam to be piped to the pump to
maintain product temperature in the pump or
to heat the pump prior to starting.
Application limits are:
Jacket Pressure: 2 bar (30 psi).
Temperature: 130ºC (265ºF).
2.10 SEALS AND FLUSHING
Three basic types of mechanical face shaft
seal are available on the Hy~Line and
Ultima pumps. The correct type should
have been selected when the pump was
originally selected but you must establish
that the seal fitted is suitable for the
application before starting pump. (See
Section 8.01 to identify seal type by pump
model number). Provide flushing system as
required.
There are also 3 types of seals which are
not mechanical face type, these are the
Single O-ring seal, Double O-ring seal
and the Multi Lip Seal.
Single O-ring Seals utilise a single Viton O-
ring on each shaft which are working under
dynamic conditions. This type of seal
requires a constant supply of pumped
product in order to avoid burning up of the
O-rings by dry running. They do not require
any additional services or special
installation. If dry running will be
experienced then the double O-ring seal
should be used. See below...
The Double O-ring Seal is similar to the
single O-ring seal, above, but have two
Viton O-rings per shaft. They can be treated
in the same way as a flushed mechanical
seal i.e. will need the provision of a flushing
system, See Flushed Mechanical Seals
below.
An alternative to flushing the Double O-ring
seal is to grease pack the area between the
O-rings. This ensures that the O-rings can
be run without product in the pump chamber
i.e. run dry, as they will be lubricated by the
grease. A method for 'topping up' the grease
will be required e.g. grease nipples.
Multi Lip Seals are supplied complete with
a grease injection system and require no
additional services.
The Single Mechanical Seal is suitable for
many clean fluids which do not require a
more sophisticated seal type. (See Figure
3).
Page 9
Hy~Line and Ultima Lobe Pumps
07/03
Figure 3:
Single
Mechanical
Seal
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