Eaton Hydrokraft PVW 250, Руководство по эксплуатации

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Assembly and installation
24
HYDROKRAFT OPERATION MANUAL PVW 250+360
E-PUIO_II001-E April 2021 www.eaton.com
5.16 Active bearing flushing – W-design
Active Bearing Flushing is mandatory for
•
applications using fluids with limited lubrications
capabilities (eg. HFC) and strongly recommended for
pumps which
•
are vented to low pressure for long periods of time or
•
pumps running at zero flow with high pressure for
longer terms or
•
when the control requires no pilot oil flow (eg. ES or
manual Flow controls)
so that pilot flow cannot be used for case/
bearing flushing ...
Active Bearing Flushing should be no less than 1% of
maximum pump flow.
Take care that pressure directly at shaft seal area does
not exceed permissible values (depending on speed,
refer to below), otherwise leakage or shaft seal damage
might occur.
This critical pressure can be measured at port L8. Pressure
can be defined by diameter of orifice, depending on
pressure level in flushing supply line
PF/VW 250 PF/VW 360
Case pressure
(overpressure)
P
case
bar
n = 1200 rev/min 2,8 2,8
n = 1500 rev/min 2,2 2,2
n = 1800 rev/min 1,6 1,6