23
Pump NB/FB/WP/SM/F
Version: 27216 - E
Schmalenberger GmbH + Co. KG
D-72072 Tübingen / Germany
4.2.5
Mechanical Seal (GLRD)
The mechanical seals used in the centrifugal pumps are not wear-free. Before removing
the pump, check the mechanical seals for damage. Always completely replace damaged
mechanical seals.
Note also the instructions below.
Three different versions of mechanical seals are installed in the pumps. Please observe
the pump specification.
1. Standard design without SKS (catchment chamber system)
2. SKS without sealing pressure (GLRD Tandem), (see Chap. 7)
3. SKS with sealing pressure (GLRD Back to Back), (see Chap. 7)
Standard without SKS
In the standard design, the mechanical seal is inserted between the motor and pump. This
design is available in two forms.
•
Without pressure relief, max. perm. pressure 13 bar
•
With pressure relief, max. perm. pressure 25 bar
4.2.6
Reassembling the Pump
Assembly is essentially disassembly in the reverse order.
To prepare for assembly, please note:
•
Thoroughly clean contamination from all individual parts.
•
Check all parts for wear. Damaged parts must always be replaced by new ones.
•
Always replace the clamp gaskets and O-rings with new ones. Grease O-rings before
installation. Exception: Do not grease the O-ring on the mechanical seal (on the counter
ring). For more information, see the special instructions for assembly of the mechanical
seal (GLRD).
•
When assembling the screw connections, tighten crosswise. Use a torque wrench to
do this.
The following table shows the
torque
to be applied for standard DIN 13 thread.
The figures apply to new, ungreased screws.
The table values do not apply if deviating values are specified on the general diagrams or
due to other instructions.
Thread:
Torque [Nm] for screws:
to plastic parts
to cast parts
to bright steel parts
M8
7
10 - 15
20
M10
8
25 - 35
40
M12
10
30 - 40
70
M16
--
60 - 90
160
M20
--
80 - 110
--
