2. Seal purge exhaust side (optional)
The pump has no hermetically sealed shaft feedthroughs at the
exhaust side. Ther
efore small amounts of gases inside the pump will
escape into the ambient air if no seal purge is used. In order to avoid
this the shaft seals at the exhaust side can be loaded with purge gas.
The purge gas will create a gas barrier that will prevent gas from inside
the pump to escape. Note that a fraction of the purge gas will also
escape to the ambient. Make sure that the pump is operated in a room
with good ventilation if other gases than air are used as purge gas.
3. Seal purge inlet side
Inlet seal purge can be used if there is a risk that harmful amounts of
dust or condensable vapours are present at the inlet of the pump.
Such substances could migrate to the inlet side bearings of the pump
and reduce the service interval signicantly. The inlet side purge is
typically only used whenever the inlet pressure increases and is active
until a pressure equalisation is reached.
Based on the type, the pump has either a manual gas ballast or 3
solenoid valves for inlet & outlet seal purge and gas ballast mounted
underneath the pump enclosure.
5.8 Manual Gas Ballast Conguration
The pump with manual gas ballast (standard version) is delivered with
components that can be mounted to the pump body in order to achieve
different water vapour tolerances.
When changing the setup, make sure that the gaskets are in good condition
and that the parts are tightened properly.
Figure 7. Manual gas ballast conguration
A. Vapour tolerance 60 mbar B. No gas ballastA. Vapour tolerance 60 mbar B. No gas ballast
1. Non return valve 2. Nozzle
3. Silencer/Filter 4. Plug (no gas ballast)
1. Non return valve 2. Nozzle
3. Silencer/Filter 4. Plug (no gas ballast)
300766038_002_C3 - 09/2021 - © Leybold
18
Installation
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