PropPressureControlValve

Description

The component PropPressureControlValve is a model of a 3-port pressure control valve with an input of set pressure. It maintains a largely constant outlet pressure even at a variable (higher) supply pressure. In addition to a 2-port pressure reducing valve it also reduces the outlet pressure to tank.

The set pressure is calculated by Input * Input scaling. If input should be in the range of 0 to 10 [V] and maximum set pressure 200e5 Pa, Input scaling must be set to 20e5 [Pa/V] (200e5 / 10). If the set pressure should be given directly by input, Input scaling must be set to 1. Please note: the upper value of set pressure is not limited but only proportional to input.

If supply pressure pA is less than Set pressure (relative value) the valve acts like an orifice with the characteristics Nominal volume flow and Nominal pressure difference.

For all pressures deviating from Set pressure (relative value) the valve opens and the flow increases linearly following the slope given by parameters Nominal volume flow and Pressure drop. For flow P->A the outlet pressure deviates by Deviation P-A @ Nominal volume flow and by Deviation P-A @ -Nominal volume flow for flow A->T.

The component PressureControlValve is not a model of a pressure control valve according to its physical structure. It merely represents the characteristic behavior of a pressure control valve. Therefore dynamic effects such as forces due to inertia will not be represented.