Engineering manual - SAB 355 Screw compressor unit (including ATEX)
004100 en 2020.10
65/156
Technical description
Fig. 41
The by-pass valve serves two purposes:
• To protect against overheating by allowing overflow if the oil pressure downstream pump
exceeds the setting of the pressure relief valve. According to KRACHT, the pump can run
continuously with “at least” 50% by-pass without overheating.
• To protect the pump against excessive pressure in case of a blocked discharge line from
the pump. It can also run for a short while with a fully blocked discharge pipe.
Fig. 42
Pump direction
All our KRACHT pumps run clockwise (seen on shaft end). Rotating counterclockwise will damage
the shaft seal.
Before the initial start-up of the oil pump, remember to check that it has the correct rotation di-
rection. Do this by looking through the fan shield mounted at the end of the motor, away from the
oil pump.
Fig. 43
+-
Hexagonal nut
-Lower response pressure
+ H
igher r
esponse pressure
Adjustment screw
Suction sidePressure side
Pump running clockwise
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