The hydraulic impedance characteristics of a cartridge type relief valve are
studied through measurement and mathematical modelling. Excellent agreement
between the model and measurements is obtained. Most of the model parameters
can be evaluated readily from measurement or calculation, though the friction
factor and bulk modulus are adjusted to match the model to the measurements.
The effect of the various physical parameters on the stability of the valve
is discussed. The hydraulic inductance through the damping orifice is shown
to have a very strong effect on the impedance and stability.
Pressure relief valve, Hydraulic impedance, stability