10 Close valve "2", recirculation will begin to recycle oil and pressure gauge "3" will indicate the
calibration pressure (that must be greater than 15/20% of the reading with valve "2" open).
11 By opening valve "2", recirculation will return motionless.
12 Close valve "4", recirculation will begin to recycle, by opening valve "4" recirculation will return
motionless.
N.B.: If air bubbles are noticed when the oil oscillates inside the tank, it means:
that you exceeded in calibrating the reset valve spring, POINT 7, (repeat operations from
POINT 7 onwards).
❑ In case of excessive pressure drops in suction;
❑ Check the filter.
➢ The pipe diameter must be greater than (or at least equal to) the pump connection and the pipe
path must be the shortest possible and have wide radius curves.
➢ The pump must be installed max 1 m over head, under head is the recommended position.
16.2 - Recirculation tank type VR 10-15-25 (VR 10 HP) calibration
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