Description
5
GA01297_002_A1 - 11/2014 - © Oerlikon Leybold Vacuum
1 Description
1.1 Design and Function
The ARS is part of the TRIVAC SYSTEM. It is an exhaust filter with oil feed-
back controlled by a float-actuated valve. It is connected to the exhaust port
of a TRIVAC B/BCS pump.
Connection of the ARS does not affect the easy modification of the pump
inlet port (vertical or horizontal installation) or the functioning of the pump’s
anti-suckback valve.
Oil mist and aerosols are trapped by the filter element, while volatile and aro-
matic substances pass through.
The oil trapped in the ARS housing is allowed to collect. When it exceeds a
certain level, the built-in float valve opens and releases the inlet aperture.
The oil is drawn out of the collector of the ARS and returned to the lubricat-
ing circuit via the feedback pipe (2/12) and the adapter (2/6) beneath the inlet
port (2/9), because when the pump is running the pressure in the collector is
higher than that beneath the inlet port. The float then drops and closes the
exhaust aperture. The oil level now gradually rising again leads to the forego-
ing procedure being repeated.
Impurities and cracking products of the oil may clog the filter elements during
operation, thus causing an overpressure in the pump.
To prevent the pressure from exceeding a specific value (approx. 1.5 bar, 7
psig), a pressure relief valve is incorporated in each exhaust filter element.
If the filter becomes clogged, the built-in pressure relief valve opens and the
filter is bypassed, thus avoiding damage caused by overpressures.
The ARS has a differential pressure indicator (2/3) to allow easy checking of
the condition of the filter elements (green: filter OK; red: change filter) .
All ARS parts that come into contact with the pumped medium are surface-
protected.
1.2 Supplied Equipment
The ARS exhaust filter with oil feedback is supplied complete with a pump
inlet adapter, connection piping with banjo bolts and all required O-ring gas-
kets as well as long fastening screws for the pump inlet port.
The ARS is pre-cleaned so that it can be used with either mineral oil (e.g.
LVO 100) or perfluoropolyether (PFPE, e.g. LVO 400).
For shipping it is sealed airtight in foil, together with silica gel.
