Mechanical Seal; Changing The Mechanical Seal - Wilo VeroLine-IPL Notice De Montage Et De Mise En Service

9.2

Mechanical seal

9.2.1 Changing the mechanical seal

(pump version with one-piece shaft)
Dismantling
Installation
9.2.2 Changing the mechanical seal
(pump version with standard motor)
Dismantling
Installation and operating instructions Wilo-IPL...N/DPL...N
• Comply with the commissioning measures, see chapter 8 "Commis-
sioning" on page 37.
There may be a slight amount of drip leakage during the running-in
period. However, a weekly visual inspection is required. If there is
clearly detectable leakage, the seal is to be changed. Wilo offers a
repair kit which contains the necessary parts for replacement.
To change/dismantle the mechanical seal for pumps with a one-piece
shaft, please refer to Fig. 1/2:
• Disconnect the system from the power and secure it against being
switched on.
• Close the shut-off valves in front of and behind the pump.
• Dismantle the motor as described in chapter 9.1.1 "Changing the
motor (pump version with one-piece shaft)" on page 39.
• Remove the circlip (Item 7) from the shaft.
• Remove the impeller (Item 2) from the shaft.
• Remove the spacer ring (Item 6) from the shaft.
• Remove the mechanical seal (Item 5) from the shaft.
• Push the counter ring of the mechanical seal out of seating in the
motor flange and then clean the seating surfaces.
• Clean the seating surfaces of the shaft carefully.
To install the mechanical seal for pumps with a one-piece shaft,
please refer to Fig. 1/2:
• Insert the new counter ring.
• Push the new mechanical seal (Item 5) onto the shaft.
• Push the spacer ring (Item 6) onto the shaft.
• Push the impeller (Item 2) onto the shaft.
• Push the new circlip (Item 7) onto the shaft.
• Insert a new O-ring (Item 8).
• Install the motor as described in chapter 9.1.1 "Changing the motor
(pump version with one-piece shaft)" on page 39.
• Comply with the commissioning measures, see chapter 8 "Commis-
sioning" on page 37.
To change/dismantle the mechanical seal for pumps with a standard
motor, please refer to Fig. 3:
• Disconnect the system from the power and secure it against being
switched on.
• Close the shut-off valves in front of and behind the pump.
• Depressurise the pump by opening the bleed valve (Item 9).
WARNING! Danger due to extremely hot or extremely cold pressur-
ised fluid!
Depending on the temperature of the fluid and the system pres-
sure, when the venting screw is opened completely, extremely hot
or extremely cold fluid in liquid or vapour form may escape or shoot
out at high pressure.
• Always exercise caution when opening the venting screw.
• Dismantle the motor as described in chapter 9.1.1 "Changing the
motor (pump version with one-piece shaft)" on page 39.
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