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5 Assembly and Operation
21
5.3
Oil Circuit
Oil passes from the pressure reservoir (- 6 - Fig. 3) into
the oil temperature regulator (- 15 - Fig. 3). At
temperatures of < 131 °F the oil flows directly through
the oil cooler
ʼ
s bypass line to the oil filter (- 10 - Fig. 3)
and is then injected into the screw compressor
(- 4 - Fig. 3).
At oil temperatures of 131 °F to 158 °F the oil flow is
divided between the oil cooler (- 11 - Fig. 3) and the
bypass line.
At temperatures of 158 °F and above, all of the oil flows
over the oil cooler into the screw compressor.
The remaining amount which arrives in the fine oil
separator (- 7 - Fig. 3) is passed through a line.
The total oil circuit is based on a pressure difference in
the system. Given a pressure difference within the oil
circuit of approx. 29 PSI, then with a container pressure
of 145 PSI, the oil will be sprayed into the screw
compressor at approx. 116 PSI.
This way, when the screw compressor is idling, a
sufficiently high pressure gradient and therefore the
required oil lubrication volume will be achieved so that
with a closed suction regulator (- 2 - Fig. 3) a vacuum is
created at the intake and at the injection point and a
positive pressure of approx. 22 PSI (residual pressure)
in the vessel.
5.4
Air Circuit
Incoming air is passes through a suction filter (-1- Fig. 3)
and the intake regulator (- 2 - Fig. 3) into the screw
compressor (- 4 - Fig. 3). It is cooled during compression
by the injected oil and the resulting mixture of
compressed air and oil flows tangentially into the
pressure reservoir (- 6 - Fig. 3). After pre-separation and
the following fine separation in the fine separator
(-7- Fig. 3), the low-oil compressed air passes through
the minimum pressure and non-return valve (-13- Fig. 3)
and the air cooler (- 14 - Fig. 3) into the distribution
system.
5.5
Regulation
Fig. 4
5.5.1
Regulator L23-L29
System Idle
•
When the system is on idle the suction regulator
(- 2 - Fig. 4) is open.
•
Solenoid valve (- Y1 - Fig. 4) is not powered.
•
The demister vessel (- 6 - Fig. 4) is vented through
the non-return valve (- 2.5 - Fig. 4) and the throttle
valve (- 2.4 - Fig. 4) into the intake channel.
Starting the System
•
The electric motor (- 3 - Fig. 4) runs in Y-operation.
•
The suction regulator is open.
•
In a few seconds a pressure of approximately
22 PSI is created in the demister vessel (-6- Fig. 4).
This pressure travels through the open solenoid
valve (- Y1 - Fig. 4) to the regulator
ʼ
s piston
chamber (- 2 - Fig. 4). This pressure is sufficient to
close the regulator.
•
The compressor sucks in a certain volume of air
through the non-return valve (- 2.3 - Fig. 4) to keep
the reservoir pressure up.
Summary of Contents for L23
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