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Voith Turbo H + L Hydraulic GmbH & Co. KG
25000057510-TED-ENX-04
11.1.3 Pressure side
In the delivery pipe, we recommend a maximum ow speed of 6 m/s (loss of
pressure!).
11.1.4 Return
In the return piping, we recommend a maximum ow speed of 3 m/s. The return
uid must not be sucked directly back in by the pump under any circumstances, i.e.
the largest possible distance must be maintained between the suction piping and the
return piping. To prevent the oil from foaming, the return uid outlet must be at least
50 mm (or three times the nominal diameter of the return piping) below the lowest
possible oil level.
11.1.5 Reverseoperationmodeonvariable-speed
pumps (IPVP, IPVA)
In the case of variable-speed drives, it is possible to switch the rotation of the pump
during operation.
Please note that, regardless of the direction of rotation, the pressure must only ever
be generated on the pressure side (small cross-section); pressure is not allowed on
the suction side (large cross-section).
In reverse mode, i.e. against the standard direction of rotation, a controlled loss of
pressure is possible by allowing the oil to ow through the pump from the pressure
side to the suction side. With this function, make sure the system is preloaded on
the pressure side. The charging pressure required depends on the speed and motor
acceleration.
If you have any questions regarding the charging pressures, the maximum
accelerations, and the speeds in reverse mode, please contact Voith Turbo
H+L Hydraulic.
12 Shutting down
This section describes how to shut down the pumps.
Removing the pressure load
Before shutting down the pump, remove the pressure load.
Internal gear pumps
Operation and shut down
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