Hydraulic pressure relief valve

@PRESSURE_RELIEF_VALVE_DEFINITION {
@PRESSURE_RELIEF_VALVE_NAME {HydPrvlName} {
@HYDRAULIC_DEVICE_MODEL_NAME {HydModl}
@HYDRAULIC_CHAMBER_NAME {HydChmb0Name, HydChmb1Name}
@VALVE_AREA {A0, A1}
@MASS_COEFFICIENT {m}
@DAMPING_RATIO {ζ}
@STIFFNESS_COEFFICIENT {k}
@ORIFICE_DISCHARGE_COEFFICIENT {Cd}
@PRELOAD_FORCE {Fp}
@FLOW_AREA_COEFFICIENT {a, b}
@VALVE_MAXIMUM_DISPLACEMENT {xmax}
@COMMENTS {CommentText}
}
}

Introduction

Figure 1. Configuration of the hydraulic chamber.

The pressure relief valve, shown in fig. 1, is connected to two hydraulic chambers, HydChmb0Name and HydChmb1Name, respectively, with pressures p0 and p1, respectively, and is associated with hydraulic device model, HydModl. It features a poppet of mass m, connected to a spring of stiffness constant k and dashpot of constant c = 2ζ√km; the spring is preloaded with a pre-load force Fp.

The description and formulation of the hydraulic chamber and elements describes the relationships among these variables.

NOTES

  1. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.