
20 UNIBLOC-PD Operation & Service Manual: PD600-677
WEAR SLEEVE
SEAL CARTRIDGE O-RINGS
ROTORS
SEAL CARTRIDGE
WEAR SLEEVE O-RINGS
ROTOR HOUSING
SHAFTS
BEARING HOUSING
RETAINING RINGS
REAR VEW- ROTOR HOUSING
FRONT VEW- ROTOR & BEARING HOUSING
REAR ROTOR HOUSING STUD NUTS
RETAINING RING BOLTS
(6 or 8 Bolts Per Seal)
fig. 4.8
The
Rotating Seal Faces (primary)
must be pressed in evenly so that the
Rotating Seal Face O-rings
(primary)
do
not come off. They have been installed correctly if they do not fall out when tilting the rotors. Do not use objects that
will scratch the
Rotating Seal Faces’
surface to push them in. Place a product compatible lubricant on the sealing
surfaces of the
Stationary Seal Faces (primary)
and
Rotating Seal Faces (primary)
. Slide the
Rotors
on the
Shafts
. Proceed to section 4.4.6 to complete the installation.
4.4.4 Triple O-Lip
®
Seal- MODELS: PD600 to PD677
(reference figs. 4.1, 4.8)
This type of seal is most frequently used with liquids that are very difficult to seal because of high viscosity. The seal
comes as a single cartridge that is easily serviced. The maximum shaft rotational speed for this seal is 500 RPM and
the maximum service pressure should not exceed 10 bar (150 psig). The seal does not require external lubrication
and can be run dry for short periods. As an option, the seal can also be flushed providing an added barrier of protec
-
tion. Flushing systems may be arranged as shown in figures 3.4-3.6. The seal can be serviced without removing the
rotor housing.
4.4.4.1 Triple O-Lip
®
Seal Removal
(reference figs. 4.1, 4.8)
Slide the
Rotors
off the
Shafts
. If the rotors will not slide off they can be removed simultaneously with the
Rotor
Housing
. Unless they are being replaced,
DO NOT USE PLIERS OR CHANNEL LOCKS TO REMOVE THE RO-
TORS. THEY WILL BE DAMAGED.
Push the
Seal Cartridges
out of the
Rotor Housing
bores. Remove the
Seal
Cartridge O-rings
. Slide off the
Wear Sleeves
. If servicing the
Bearing Housing
, remove the
Rotor Housing
by
first disconnecting the flushing system, if applicable, and loosening the
Rear Rotor Housing Stud Nuts
. Use a hoist
and eye bolt to support the
Rotor Housing
. Tap on the ports with a rubber mallet and pull the
Rotor Housing
off. The
Retainer Rings
do not have to be removed to service the seal.
4.4.4.2 Triple O-Lip
®
Seal Installation
(reference figs. 4.1, 4.8, 4.15)
Clean all components prior to installing the seals. If the
Rotor Housing
was removed, assemble it to the
Bearing
Housing
first. Make sure
Retainer Rings
are attached to the
Rotor Housing
. Using an eye bolt, hoist the rotor
housing on the
Dowel Pins
(see fig. 4.15 on pg. 24) and slide it on, while at the same time threading on the
Rear
Rotor Housing Stud Nuts
. Tap the
Rotor Housing
with a rubber mallet to seat it properly against the
Bearing Hous-
ing
. Tighten the
Rear Rotor Housing Stud Nuts
in a cross pattern. Check the
Wear Sleeves
for excessive wear. If
grooves are noticeable, the sleeves may have to be replaced, otherwise the seal may not function properly or may fail
prematurely. Coat all
O-rings
,
Shafts
, and the seal surface of the
Wear Sleeves
with a lubricant that is acceptable for
contact with the product. Slide the
Wear Sleeves
on the
Shafts
and locate on the
Anti-Rotation Pins
. Slide mounting