UNIBLOC-PD Operation & Service Manual: PD200-576 27
4.4.6 Double O-Ring Seal
This type of seal uses two o-rings, or optional quad rings, to seal against a rotating shaft. It is most frequently used when the
liquid viscosity is greater than 2,000 cPs or is sticky. The maximum shaft rotational speed for this seal is 350 rpm and the maxi-
mum service pressure should not exceed 8 bar (115 psig). The seal must be lubricated by an external method such as grease or a
flushing system as discussed in section 3.3. If seal is grease filled, the
Flush Housing
should be check weekly to ensure that it is
adequately lubricated. Add grease via the
Grease Nipples
if necessary.
Retaining Ring O-Rings
Seal O-Rings
Flush Housings
Bolts
Threaded Studs
Rotor Housing
Seal O-Rings
Grease Nipples
4.4.6.1 Double O-Ring Seal Removal
If using a flushing system as discussed in section 3.3, disconnect it from the
Flush Housings
. Loosen the stud nuts (item 43
in Figure 4.4.1). Remove the
Rotor Housing
by pulling on the ports or by tapping gently with a rubber mallet. All seal parts
will come off with the housing. Remove the
Flush Housings
by unscrewing the
Bolts
. The
Retaining Ring O-Rings
and
Seal
O-Rings
can now be removed.
4.4.6.1 Double O-Ring Seal Installation
Check the shafts or optional sleeve for wear. If grooves are noticeable, they may have to be replaced. Otherwise, the
Seal
O-Rings
may not seal properly or may fail prematurely. Place new
Seal O-Rings
into the grooves of the
Flush Housings
. Attach
the
Flush Housings
to the
Rotor Housing
with the
Bolts
. Coat the o-rings and the shafts with a lubricant approved for use with
the pumped product.
See section 4.4.7 for completing the installation
.
It is imperative that the cavity between the o-rings is
filled with grease or the flushing system is reconnected before operation is resumed.
UNIBLOC-PD Double O-Ring Seals
Summary of Contents for 54001010P20H6010T12E
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