Description
16
300407956_002_C1 - 01/2017 - © Leybold
Cooling Water System
Fig. 1.3 shows the flow path entering at water inlet 1, cooling down the
motor (2 -> 3), the gear box (4 -> 5), the casing and the high pressure side
plate. Then it enters the main cooler (6 -> 7). After passing the main cooler at
7 the cooling water exits at outlet 8. Casing and high pressure side plate are
both cooled down by the coolant in the water jacket (indirect cooling).
There is another line between main cooler and expansion vessel, to resupply
the coolant. The expansion vessel has another pipe to balance its pressure.
There are thermal switches on motor and casing to protect the pump.
Connect the thermal switches of motor and casing to the protection circuit
of your equipment, or it might cause pump damage. With the LEYVAC CC
versions both temperature switches are connected to the CC controller. If
the CC pump is not sufficiently cooled, the pump will be switch off auto-
matically to protect it from damage.
NOTICE
Purge Gas System
Operate the pump with purge gas at all times.
The pressurized purge gas comes into the pump via the inlet. Adjust the reg-
ulation pressure (by pressure regulator) to the specified value, and supply the
correct amount of purge gas to the pump. The pressure is shown at the
pressure gauge. The purge gas piping can be divided into two sets of pipe
lines.
LEYVAC LV 80 / 140
Purge Gas
Rotor Purge
Shaft Seal Purge
24 V DC
Fig. 1.4b Purge Gas System (schematic)
LEYVAC LV 80 / 140 / 250
NOTICE
Fig. 1.4a Purge Gas System
Rotor Purge (A) -->
24 VDC Valve
Shaft Seal Purge (B) -->
