Engineering manual - SAB 355 Screw compressor unit (including ATEX)
004100 en 2020.10
53/156
Technical description
On high-stage systems, the check valve, CV-4, should be installed with a 3.1 bar [45 psi] spring
to avoid the possibility of back-feeding to a shutdown compressor from a common economiser
vessel.
On booster systems, the check valve, CV-4, should be installed with a 1.7 bar [25 psi] spring to
avoid the possibility of air ingress into the system if the system suction pressure is below
atmospheric.
NV-2 must be closed if the oil pump should run for long periods of time when the compressor is
stopped. This is important in order to avoid oil being pumped up the suction line.
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