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This Document Has Been Superseded
A newer publication replaces it: BSI BS ISO 8426-2
Hydraulic fluid power. Positive displacement pumps and motors. Determination of derived capacity
This International Standard specifies the methods of determining the *derived capacity* of hydraulic fluid power positive displacement pumps and motors under steady-state conditions and at defined, continuous shaft rotational frequencies.
Units can be tested as a positive displacement pump, with mechanical energy applied to the shaft and hydraulic energy obtained at the outlet fluid connection, or as a motor, with hydraulic energy supplied to the inlet fluid connection and mechanical energy obtained at the shaft.
NOTE Measurement accuracy is divided into three classes A, B and C, which are explained in .
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