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HYDRAULIC SCREW COMPRESSORS
OPERATING PRINCIPLES
3.4.1. FUNCTIONAL PRINCIPLE OF PNEUMATIC INTAKE CONTROL
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2
3
Picture 9: Functional principle of pneumatic intake control
1. Intake valve
2. Air pressure control valve
3. 3/2 way valve
The intake valve is normally open. When the preset pressure at the air pressure
control valve is reached, the pilot air (blue in the picture) closes the intake valve.
When the intake valve is closed compressor is in standby mode.
When the air in air supply line is used and the pressure drops, the air pressure
control valve reduces the pilot air flow so that the intake valve opens and intake
regulator maintains the set pressure.
When the compressor unit is stopped, the rising pressure (red in the picture) above
the screws activates the 3/2 way valve. The pressure in the compressor is releaved
via the 3/2 way valve and the relief nozzle.
Summary of Contents for HKR 1300
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