INOXPA HLR, Installation, Service And Maintenance Instructions

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(A) 2021/11 7.Maintenance 27
7.7.2. Balanced double mechanical seal
Mechanical seals are fragile parts. Take care when handling them.
Do not use any screwdriver or similar tool to pull out the parts.
• Clean all the components of the mechanical seal before placing them.
• Check that the working surfaces are not damaged. INOXPA recommends replacing the entire mechanical seal if one of the
working surfaces has a defect.
• Replace the O-rings during assembly.
Pos. Description
Double mechanical seal
01 Rotary part
02 Stationary part
03 O-ring
04 Washer
05 Static Holder
06 Insert
07 Insert
08 O-ring
09 Grub screw
10 Drive ring
11 Wave Spring
12 Rotary Holder
13 Wave Spring
14 O-ring
Disassembly
Pump size 0: Remove the shaft sleeve (13) mounted on each shaft. Sleeves are not interchangeable.
Remember the shaft each sleeve was mounted on.
Pump size 1, 2, 3, 4: Remove the shims (32) mounted on each shaft. If more than one is mounted on
each shaft, keep them separate to prevent them from getting mixed up.
• Normally the Rotary Assembly (01) remains housed in the lobe rotor during disassembly. Remove them carefully.
• Remove the stationary parts (02 + 05) from the rotor case bores along. Please proceed carefully.
•
Remove the 4 seal washers located to the rear of rotor case. Or, 4 Allen screws at pump size 0.
• Loosen the grub screws (09).
• Remove carefully the rotary holder (12) and the drive ring (10) from the shafts along.
Assembly
Pump size 0: Fit the shaft sleeves (13) on each origin shaft.
Pump size 1, 2, 3, 4: Fit the shims (32) on each origin shaft.
• Lubricate all the O-rings of the mechanical seal with soapy water or oil compatible with the material of the seals.
Note: Pump size 0. Be sure that shaft sleeves (13) are already assembled on the pump before mounting the
mechanical seal.
•
Mount the drive ring (10) and the rotary holder (12) onto the pump shafts as far as they will go and fix them to the shafts
with the grub screws (09).
• Clean the working surfaces with solvent.
• Mount the 4 seal washers located to the rear of rotor case. Or, 4 Allen screws at pump size 0.
• Mount the drive ring (05) into the rotor case bore, taking care to align it with the 4 seal washer located in the back of the
rotor case.
• Fit the stationary part (02) with the drive ring (05) into the rotor case bore, ensuring that the pins of the drive ring (05)
engage with the biggest slots of stationary part (02).
• Mount the rotary assembly (01) to the lobe rotor ensuring that the lobe pins engage with the slots of the rotary face (01),
and it remains perfectly flat.
• Clean the working surfaces with solvent.
• Reassemble the lobe rotor according to
7.5.5 Lobe assembly .
• See paragraph 7.6.3
Lobe/Pump Rotor case adjustment using shims
.