Replacement of mechanical seal V(S)F 24/32/45/65 - DP pumps

Replacement of
mechanical seal
V(S)F 24/32/45/65
CONTENTS
page
1. Introduction ............................................................................................................................2
2. Removing the seal (situation A + B) .......................................................................................3
3. Situation A: Replacement without a flat ring..........................................................................4
4. Situation B: Replacement with a flat ring...............................................................................7
5. Instructions situation A (without flat ring) ...........................................................................10
6. Instructions situation B (with flat ring) ................................................................................11
Subject to revision without prior notice.
Article: BE00000206
Date: october 2007

1. Introduction
This instruction describes the replacement order of the mechanical cartridge
seal of the V(S)F 24/32/45/65 pump.
Since there are two types of cartridge seals, make sure you use the right
instruction. The major difference is the presence (or lack) of a white flat ring
and the seal disc.
❒ If the seal is assembled without a white flat ring, use instruction A.
❒ If the seal is assembled with a flat ring, use instruction B.
For instruction A, see chapter 2 + 3, for instruction B see chapter 2 + 4.

2. Removing the seal (situation A + B)
P = 0
A1, B1 A2, B2
A3, B3 A4, B4

3. Situation A: Replacement without a flat ring
A5 A5
A6, 7, 8, 9 A6, 7, 8, 9

A10 A10
A11 A11, 12
4 x 10 Nm
3 x 5 Nm

A13 A14
4 x 70 Nm
A15 A16

4. Situation B: Replacement with a flat ring
B5 B5
B6, 7, 8, 9 B6, 7, 8, 9
4x
NEW

B10 B10
B11 B11
4 x 10 Nm

B12 B13
4 x 70 Nm
3 x 5 Nm
B14, 15 B16

5. Instructions situation A (without flat ring)
A1. Check if pump is pressure-less and if not, make it pressure-less.
A2. Remove coupling protections, disassemble the coupling halves and the
coupling pin.
A3. Unscrew the three bolts partly and the four bolts completely.
A4. Lift the cartridge seal from the shaft. (Place a screwdriver between the
seal disc and the top bracket if necessary)
A5. Unscrew the bolts completely and remove the cartridge ring and the seal
disc from the cartridge bush.
A6. Remove the old static part of the mechanical seal from the seal disc. Wet
the seal disc with water or a soap solution and place the new static part.
A7. Remove the old rotating part of the mechanical seal from the cartridge
bush. Clean the cartridge bush and check for damages.
A8. Wet the cartridge bush with water or a soap solution and place the new
rotating part.
A9. Remove the O-rings from the cartridge bush and the seal disc and replace
them by new ones.
A10. Slide the seal disc on the cartridge bush followed by the cartridge ring and
screw the bolts partly.
A11. Wet the shaft with water or a soap solution and place the new cartridge
seal. Screw the four bolts into the topbracket.
A12. Make sure that the shaft is in its bottom position, and tighten the three
bolts equally.
A13. Assemble coupling pin and coupling halves on the shaft. Screw on the
socket-head screws loosely by hand.
A14. The pump shaft and coupling can move vertically approximately 5 [mm]
and must be set in the middle of its total travel range to properly set the
impellers and mechanical seal. Adjust the shaft to the correct position A
by means of a large flat blade screwdriver underneath the coupling halves.
Make sure the coupling can move smoothly over the motor shaft, so that
the motor shaft will not be lifted out of the bearing.
A15. When the pump shaft is at the right level, retighten the socket-head
screws cross-wise and equally. Couplings need to have an equal opening
on both sides.
A16. Mount the coupling protections with screws on the top bracket.

6. Instructions situation B (with flat ring)
B1. Check if pump is pressure-less and if not, make it pressure-less.
B2. Remove coupling protections, disassemble the coupling halves and the
coupling pin.
B3. Unscrew the three bolts partly and the four bolts completely.
B4. Lift the cartridge seal from the shaft. (Place a screwdriver between the
seal disc and the top bracket if necessary)
B5. Unscrew the bolts completely and remove the cartridge ring, the flat ring
and the seal disc from the cartridge bush.
B6. Remove the old static part of the mechanical seal from the seal disc. Wet
the seal disc with water or a soap solution and place the new static part.
B7. Remove the old rotating part of the mechanical seal from the cartridge
bush. Clean the cartridge bush and check for damages.
B8. Wet the cartridge bush with water or a soap solution and place the new
rotating part.
B9. Remove the O-rings from the cartridge bush and the seal disc and replace
them by new ones.
B10. Slide the seal disc on the cartridge bush followed by the new flat ring and
the cartridge ring and screw the bolts partly.
B11. Wet the shaft with water or a soap solution and place the new cartridge
seal. Screw the four bolts into the topbracket.
B12. Assemble coupling pin and coupling halves on the shaft. Screw on the
socket-head screws loosely by hand.
B13. The pump shaft and coupling can move vertically approximately 5 [mm]
and must be set in the middle of its total travel range to properly set the
impellers and mechanical seal. Adjust the shaft to the correct position A
by means of a large flat blade screwdriver underneath the coupling halves.
Make sure the coupling can move smoothly over the motor shaft, so that
the motorshaft will not be lifted out of the bearing. Use a pen or pencil to
make position Amin and Amax visible.
B14. When the pump shaft is at the right level, retighten the socket-head
screws cross-wise and equally. Couplings need to have an equal opening
on both sides.
B15. Tighten the three bolts equally.
B16. Mount the coupling protections with screws on the top bracket.

10-2007
BE00000206