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4.4.3 Double Mechanical Seal
The flushed Double Mechanical Seal uses the same
Stationary Seal Faces (primary & secondary)
and
Stationary Seal O-rings
(primary & secondary)
as the Single Mechanical Seals discussed in section 2.1.2. The Drive Collar and Rotating Seal Face are
different, however. The flushed Double Mechanical Seal is not available for
UNIBLOC
200-0, 200, 250, and 275. See section 3.3
for more information about flushing systems.
4.4.3.1 Double Mechanical Seal Removal
Disconnect the flush tubing from the
Flush Housings
. Loosen the
Drive Collar
set screws by inserting an allen wrench into the
flush housing port holes. Loosen the stud nuts (item 43 in Figure 4.4.1). Remove the rotor housing (item 1 in Figure 4.4.1) by
pulling on the ports or by tapping gently with a rubber mallet and lay it rotor cavity down so that the seals face up. Do not rock
the housing back and forth excessively or let it come in contact with the shaft splines. The seals may break. The entire Seal
Package, with the Flush Housings attached, will come off with the rotor housing. Unscrew the
Bolts
to remove the
Flush
Housings
, the
Stationary Seal Faces (secondary)
,
Flush Housing O-Rings,
and
Stationary Seal O-Rings (secondary)
. The
remaining seal components may now be removed. To avoid damage, handle and store the loose Seal Faces so that their lapped
sealing surfaces do not get scratched. Remove the
Stationary Seal Faces (primary)
by pulling them out of the rotor housing seal
bores. Remove the
Stationary Seal Faces (secondary)
by pushing them out of the
Flush Housings
.
Double Mechanical Seals
