Maintenance; Checking The Shaft Seal; Replacing The Shaft Seal - Apv W+ Bedienungsanleitung

381434 ISS S 01.98
Dismantling the pump
Dismantling the shaft seal
Checking
wearing parts
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Maintenance

5.1 Checking the shaft seal

Check the shaft seal in the pump for leaks on a regular basis. If the
shaft seal is leaking, replace it or its relevant parts as described below.

5.2 Replacing the shaft seal

The general drawing shows the position and structure of the shaft seal
- both ordinary seals and seals with water/steam flushing.
To replace the shaft seal, it is necessary to dismantle the pump as
described below. The general drawing is to be used for reference.
1. Disconnect the power supply in the motor safety switch unit by
removing the fuses and disconnecting the cables.
2. Switch off the steam and flushing water supply.
3. Close the inlet and discharge of the pump, and make sure that
there is no liquid in the pump body.
If the pump is used for hot and/or aggressive liquids, special pre-
cautions must be taken. In such cases, observe the local regula-
tions for personal protection when working with these products.
4. Once the intake and outlet pipes have been closed properly, open
the clamping ring (pos 2), take off the pump body (pos 1) and
remove the impeller (pos 4).
5. Remove the stator ring (pos 11) mounted in the back plate
(pos 7) with your fingers.
6. Remove the O-ring (pos 12) from the stator ring.
7. Use your fingers to remove the rotor ring (pos 10) mounted in the
impeller (pos 4).
8. Remove the O-ring (pos 13) from the rotor ring.
9. Clean the stator and rotor ring chambers, if necessary with air or
water.
9a. In the case of water-flushed/aseptic shaft seals, the back plate
must be removed to dismantle the back shaft seal. The back seal
stator ring (pos 16) is mounted in the holding ring (pos 20) and
the rotor ring (pos 15) is mounted on the shaft (pos 6). These are
removed in the same way as the front seal components.
10. Check O-rings (pos 12,13) for signs of stiffness, lack of elasticity,
brittleness and/or perishing. Replace worn or defective parts.
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