Voith IPV Series - Torque Management; Calculating Hydraulic Pump Torque; Calculating Multi-Stage Pump Torque

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Voith Turbo H + L Hydraulic GmbH & Co. KG 25000057510-TED-ENX-04
17.3 Torque
Pressure relief valve
Note that the setting of the pressure relief valve, the permitted peak pressure of the
pump is not exceeded (see chapter 5.2). Voith pressure lrelief valves (type DBV) are
delivered with a pressure setting of approx. ∆p = 3 – 6 bar.
Excessively high
The torque that is generated between the individual delivery stages of triple and
quadruple pumps can achieve excessively high values that can damage the pump!
Permitted torque
The total torque of the individual pump stages must not exceed the permitted values
(see chapter 17.4)!
Reduce pressure
In view of this, in the event of multistage pumps, it may be necessary to reduce the
generated torque by using a pressure relief valve in the respective pump stages.
Check and calculate the torques as follows:
17.3.1 Calculating the torque of a hydraulic pump
17.3.2 Calculating the overall torque of a multi-stage
pump
M
d
= input torque in Nm
V
gth
= pump volume in cm
3
/ rotation
∆p = pressure in bar
M
dA
= A-pump input torque (1st pump)
M
dB
= B-pump input torque (2st pump)
M
dC
= C-pump input torque ( 3st pump)
M
dges
= M
dA
+ M
dB
+ M
dC
+ ...
M
d
=
V
gth
x ∆p
2 x π x 10
Internal gear pumps
Pump combinations - conguration
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