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HYDRAULIC SCREW COMPRESSORS
OPERATING PRINCIPLES
3.8. MINIMUM PRESSURE VALVE
1
2
3
4
5
6
7
8
A
B
C
Picture 14: Operating principle of minimum pressure valve
A. MPV closed
B. MPV open
C. MPV open, non-re-
turn valve closed.
1. Non-return valve plate
2. Non-return valve spring
3. Seal
4. Pressure holding valve piston
5. Pressure holding valve spring
6. Pressure holding valve housing
7. Adjustment screw / counternut
(only in HKR500 and HKR7500)
8. Compressed air connection
The minimum pressure valve is used as a:
Pressure holding valve
When there is no counter-pressure in air supply line, it prevents the pressure from
dropping below the minimum pressure set at the pressure holding valve (factory
setting approximately 5.5 bar). This pressure is necessary to ensure the oil supply
to the compressor. At the same time this is the condition for good oil separation.
Non-return valve
It prevents compressed air flowing back from the system. This valve operates
automatically.
ATTENTION!
The minimum pressure valve is not an over-flow valve for continuous
operation (it is only used for the starting sequence until the higher
operating pressure is reached and subsequently determines a higher
system pressure).
Summary of Contents for HKR 1300
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