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•
Check the coil springs are in place in the seal
housings.
•
Fit the Quad ring (83) to the seal face and
lubricate the bore in the seal housings with a
suitable lubricant compatible with the pumped
fluid and process. Ensure the Quad ring does
not roll during fitting.
•
DO NOT use mineral-based lubricants on
EPDM elastomer joints; silicone grease is
suitable.
•
Align one slot in the rear of the static seal
face with the pin in the seal housing and push
the face back firmly against the coils springs.
It should be free to 'spring' backwards and
forwards.
•
To fit the seat to the rotor, first fit a new cup
rubber (83) to the seal face. Ensure the seal
face is the correct way round, i.e. the smooth
working face exposed.
Note – the back (non-working) face of the seal is
identified with a groove or white mark.
•
Lubricate the outside diameter of the cup
rubber with a suitable lubricant (As noted
previously), and press the face evenly into the
rotor.
•
Use a soft sleeve made from Nylon, as shown
in Figure 23, and fit it into the end of the tool
as shown in Figure 26.
Alternatively use your fingers to do this in
order to avoid damage to the seal face.
Figure 26 - L Cup insertion tool
•
When correctly fitted the seal face should be
'flush' with the back face of the rotor and
MUST NOT be tilted. Any 'run-out' of the seal
face could cause seal leakage.
•
The cup rubber SHOULD NOT stand 'proud'
of the back face of the rotor.
•
6.4 MECHANICAL SHAFT SEALS -
SINGLE FLUSHED
Pumps fitted with flushed seals have lip seals
fitted in order to retain a flushing or barrier fluid.
To service lip seals it is necessary to remove the
rotor case (51) (6.7 ROTOR CASE)
Removal:
•
Remove the seal housings (89) from the back
of the rotor case. (see 6.6 SEAL HOUSINGS).
•
Press the lip seals out of the housings.
•
Check that the surface of the shaft where the
lip seal runs is smooth and is not grooved.
Note for HP32 and HP34 models Check that
the surface of the sleeve where the lip seal runs
is smooth and not grooved.
Where necessary replace the sleeve by lightly
heating the sleeve which will break the bond of
the adhesive. With a soft lever, prise the sleeve
off the shaft.
Re-Fitting HP 4-6:
•
Push the new lip seals into the housings.
Assemble the spacer collar, wave spring and
drive plate as shown in Figure 30. (Also see
6.6 SEAL HOUSINGS)
•
When re-fitting the seal housings, align the 3
slots in the outer edge of the drive plate with
the 3 pins. When fitted, ensure the drive plate
can slide freely against the spring pressure.
•
You may wish to insert the O-ring (83a) and
static primary seal seats at this point (see 6.3
PRIMARY SEALS).
•
When re-fitting the rotor case to the bearing
housing, take care that the lip seals and
mechanical seals (80) are not damaged by the
shaft splines or shaft ends.
27
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