2 Machine description
2-6
2.3 Compressor unit (cont.)
Air end (item 8)
The direction of rotation of the air end is to the left (anti-
clockwise) when looking from the front-side on to the shaft (see
picture). Pay attention to the directional arrow on the side of the
air end with the sign D.
Suction air filter (item 6)
The suction air filter is directly mounted on to the suction stud of
the suction regulator.
The dry micro-filter with a rating of 10 µm filters the intake air.
Pressure switch (electric)
The pressure switch is directly connected to the outlet of the
machine. It controls the suction regulator. The values for p
max
and p
min
are set at this switch.
p
max
: is the upper service pressure at which the unit normally
stops pumping
P
min
: is the lower service pressure at which the unit normally
starts pumping again.
The pressure switch has been correctly set in the factory.
Authorised personnel must only carry out adjustments to the
pressure switch.
Suction regulator
The suction regulator is directly connected to the air end. It con-
trols the air volume sucked in by the compressor via the air suc-
tion filter.
Function of the suction regulator:
The suction regulator comprises of one main valve. This oper-
ates as a control valve and at the same time as a hermetically
sealed isolator valve. At full load the suction cross-section is
fully opened.
When the machine stops this valve closes quickly and thus the
suction cross section is locked altogether.
The multi-functions of the regulator are ensured by just one
flange mounted control unit.
Minimum pressure valve
The minimum pressure valve is situated at the outlet of the
compressor unit just before the air-after cooler.
It performs two tasks:
1) As a minimum pressure valve it prevents a loss of pressure
(in the air end) when no counter pressure in the air-mains is
available. A minimum pressure is necessary in order to safe-
guard lubrication of the air end.
Description
aggregate
components
