9
10.3 Mechanical shaft seal
If the pump has a reservoir for quench liquid (such as O2), check that the
level of liquids is approximately 3/4 of the reservoir volume. The liquid in the reser-
voir must be compatible with the pumped liquid. Unless otherwise specified, the
shaft seal gaskets are PTFE.
10.4 Axial rotor adjustment
After many hours of operation, the clearance between the rotor and cover can increase causing loss of capacity and pressure. It is possi-
ble to take up part of the clearance by adjusting the lock rings which fix the eternal ball bearing.
To adjust the lock rings, use a prong spanner.
❑
Loosen the security dowels.
❑
Loosen the internal lock ring
❑
Tighten the outer lock ring as far as it will go.
❑
Loosen the outer lock ring as shown in the table below.
❑
Tighten the inner lock ring and fix the security dowels.
Note: In the models V 120-2, V 150-2, V 151 and V 200
only the internal lock ring is fixed and the following two
operations should be carried out:
❑
Loosen the outer lock ring by 1/8 of a turn
❑
Fix the security dowel ( models V25-2 and V30-2 do not
have security dowels).
10.5 Regulation of the by-pass relief valve
(Example of setting not 8 bar)
The by-pass must be set with the pump in operation
❑
Unscrew the cap
❑
Loosen the lock nut (if fitted).
❑
Tighten the regulation screw almost as far as it will go (turn the screw clockwise to load the spring).
❑
Adjust the delivery valve of the piping system until the pressure gauge reading on the deliveryside is the required setting (in our exam-
ple, 8 bar).
❑
Loosen the regulation screw (turn it anticlockwise to unload the spring) until the pressure gauge reading starts to fall below the setting
(eg 8 bar).
❑
At this point, the by-pass is set and the delivery valve can be opened to let the system operate normally.
❑
To reset the by-pass to a higher or lower pressure, follow the same procedure.
❑
When the spring is not compressed, the regulation screw can be freely unscrewed. It is not advisable to unscrew any further.
Attention: It is essential to use caution when working with inflammable or corrosive liquids.
11
DISASSEMBLY
If the pump is under warranty, do not disassemble without consulting the manifacturers or their authorized representative. If this is not
observed, warranty will not apply.
Before opening the pump, ensure that:
❑
the liquid inside is not under pressure
❑
if liquefied gas is being pumped, that all the gas has been vented
❑
if not liquids are being handled, that the liquid has cooled.
For large, heavy pumps (eg V 100-2, V 120-2, V 151, V 150-2, V 180 and V200) adequate hoisting equipment is necessary to handle the
components.
Ensure that machined surface are protected before hoisting or moving with cables or other devices.
Do not use water to clean the pump and its components. If this is inevitable, dry carefully and coat will oil.
option
+O2
fig. 8
inner bearing cover
outer bearing cover
.K pumps and
Packed gland
Class 2
Class 3
Viscosity
up to 600 cSt and up to 180 deg C (1)
from 600 to 6000 cSt and up to 180 deg C
Class 3
Others
Class 1
Class 2
Class 3
over 6000 cSt and over 180 deg C
Pump type
Class
1
1/8
0,187
V25-2
V30-2
1/4
0,37
1/3
0,5
1/8
0,25
V50-3
V60-2
V70-2
V80-2
1/4
0,5
1/3
0,7
1/6
0,3
V85-2
1/3
0,7
—
1/4
0,5
V90-2
V100-2
1/2
1,0
V120-2
V150-2
V151
3/4
1,5
V180
V200
2
3
1/4
0,5
1/3
0,7
1/3
0,7
3/3
2
1/3
0,7
2/3
1,5
Note: The upper figure is the fraction of a turn of the outer lock ring
while the lower figure is the corresponding distance in mm between the
rotor and cover.
fig. 9
