Instruction book
2012 2039 28
21
2.3 Regulating Circuit
Load/unload regulating system
Regulating system (loaded condition)
Loading
When the net pressure is below the loading pressure, solenoid valve (Y1) is energised. Results
The space above unloading valve/blow-off valve (UV) is connected with the reservoir pressure (1) via the
solenoid valve.
Unloading valve/blow-off valve (UV) moves downwards, closing off the connection to channels (2) and
(3).
Under pressure from the airend (AE) causes loading plunger (LP) to move downwards and inlet valve (IV)
to open fully
Air delivery is 100%, the compressor runs loaded
Unloading
If the air consumption is less than the air output of the compressor, the net pressure increases. When the
net pressure reaches the unloading pressure, solenoid valve (Y1) is de-energised. Results
The pressure above unloading valve/blow-off valve (UV) is released to atmosphere and the space above
valve (UV) is no longer in connection with the oil separator tank pressure (1).
Unloading valve/blow-off valve (UV) moves upwards, connecting the reservoir pressure (1) with channels
(2) and (3).
The pressure in channel (2) causes the loading plunger (LP) to move upwards, causing inlet valve (IV) to
close, while the pressure is gradually released to atmosphere.
The pressure in the separator tank stabilises at low value. A small amount of air is kept drawn in to
guarantee a minimal pressure, required for lubrication during unloaded operation.
Air output is stopped, the compressor runs unloaded.
Summary of Contents for QGV 40
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Page 16: ...Instruction book 2012 2039 28 16 Main components Main components...
Page 128: ...Instruction book 2012 2039 28 128 Appendix 1 Product Analysis Report...
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