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Figure 27 - Single flushed mechanical seal
Re-Fitting HP3:
•
Push the new lip seals into the seal housings.
•
Fit the O-rings into the grooves in the outside
diameter of the housings
•
Assemble the seal housings (89) into the rear
of the rotor case (51) and clamp in position
using the four clamp washers (84) and screws
(85).
•
If the shaft sleeves have been removed, fit
the new sleeves. These will need to be glued
to the shaft by spraying the area of the shaft
were the sleeve is to fit and also the inside
bore of the sleeve itself with LOCTITE TM
Activator 7471.
•
Then smear a generous amount of LOCTITE
TM 635 to the area of the shaft where the
sleeve is to fit. Slide the sleeves onto the
shafts up to the shoulder on the shaft; note
that the sleeve cannot be pushed fully against
the shoulder because of the radius in the
corner. The sleeve should be fitted with the
chamfered end towards the front of the pump.
•
Rotate the sleeve on the shaft to ensure that
the LOCTITE TM forms a seal as well as a
bond. Leave for 5 minutes to allow the
bonding process to occur.
•
Continue by following the instructions in
section 6.6 for assembly of the mechanical
seal.
6.5 SECONDARY MECHANICAL
SEALS – DOUBLE
(Refer to 6.3 PRIMARY SEALS - for servicing of
primary Seals.)
Pumps fitted with double seals have secondary
seals in order to retain a flushing or barrier fluid.
To service primary seals refer to 6.03 Primary
Seals.
To service secondary seals it is necessary to
remove the rotor case (6.7 ROTOR CASE).
Note: Not available on HP32 and HP34 pumps.
Figure 28 - Double mechanical seal
Removal:
•
Remove the static faces from the housings.
(95)
•
If fitting new O-rings (93) prise them out of
the housing (95).
•
Pull the rotary seats (92) off of their shafts.
Take care not to scratch or damage the
smooth faces of the seals. Keep each seal
with its respective shaft to ensure correct
mating of the seal faces on re-assembly – you
may wish to label the components at this
stage.
•
If fitting new O-rings (93) prize those out of
their seal face (92). It is not normally
necessary to remove the seal housings (95)
from the back of the rotor case except to
check condition of springs (82) and drive
plates (81) (See 6.6 SEAL HOUSINGS).
Re-Fitting:
•
To re-assemble, place the O-ring (93) in the
double seal housing (95), lubricate the
outside of the static seat with a suitable
lubricant compatible with the barrier fluid.
Align the slots in the seal face with tabs of
drive plate (94) in the seal housing, (Figure
28) and push the seat fully in. The seat
should slide freely against the plate (94) and
wave spring (82).
•
If fitting double seals to a pump for the first
time, e.g. retrofitting a single seal pump,
gently tap or press the support ring (92b)
square up against the shoulder on each shaft.
28
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