The pressure in this hydraulic system is determined by the following equation, based on the definition of the bulk modulus.

where,
•
is pressure change rate
•
is Bulk modulus
•
is chamber volume
•
is the sum of all changes of
the volume.

In this equation:
•
is the pressure chamber volume
change rate
•
is the oil flow through check
valve
•
is the oil flow through the
leakage gap