Generic Valve $—$ Basic model for generic valve

The Generic Valve component calculates the pressure loss for a given valve geometry (selected by the user). The calculation depends on the opening of the valve.

Connections

 Name Description Modelica ID ${\mathrm{port}}_{A}$ Layout of port where oil flows into an element ($0<{m}_{\mathrm{flow}}$, ${p}_{B}<{p}_{A}$ means $0<\mathrm{Δp}$) port_A ${\mathrm{port}}_{B}$ Hydraulic port where oil leaves the component (${m}_{\mathrm{flow}}<0$, ${p}_{B}<{p}_{A}$ means $0<\mathrm{Δp}$) port_B $\mathrm{oil}$ oil $\mathrm{opening}$ opening

Parameters

General Parameters

 Name Default Units Description Modelica ID ${\mathrm{ΔT}}_{\mathrm{system}}$ $0$ $K$ Temperature offset from system temperature dT_system

Hydraulic Resistance Parameters

 Name Default Units Description Modelica ID $\mathrm{geometry}$ [1] Choice of geometry for valve geometry valve coefficient [2] Choice of valve coefficient valveCoefficient $\mathrm{Av}$ [3] Av (metric) flow coefficient [Av]=m^2 Av $\mathrm{Kv}$ $\frac{10000000}{277}\mathrm{Av}$ Kv (metric) flow coefficient [Kv]=m^3/h Kv $\mathrm{Cv}$ $\frac{5000000}{123}\mathrm{Av}$ Cv (US) flow coefficient [Cv]=USG/min Cv ${\mathrm{Δp}}_{\mathrm{nominal}}$ $1000$ $\mathrm{Pa}$ Nominal pressure loss dp_nominal ${m}_{\mathrm{flow}\left(\mathrm{nom}\right)}$ [4] $\frac{\mathrm{kg}}{s}$ Nominal mass flow rate m_flow_nominal ${\mathrm{\rho }}_{\mathrm{nominal}}$ $1000$ $\frac{\mathrm{kg}}{{m}^{3}}$ Nominal inlet density rho_nominal ${\mathrm{opening}}_{\mathrm{nominal}}$ $\frac{1}{2}$ Nominal opening opening_nominal ${\mathrm{\zeta }}_{\mathrm{tot}\left(\mathrm{min}\right)}$ $0.001$ Minimal pressure loss coefficient at full opening zeta_TOT_min ${\mathrm{\zeta }}_{\mathrm{tot}\left(\mathrm{max}\right)}$ ${10}^{8}$ Maximum pressure loss coefficient at closed opening zeta_TOT_max ${\mathrm{Δp}}_{\mathrm{small}}$ $\frac{1}{100}{\mathrm{Δp}}_{\mathrm{nominal}}$ $\mathrm{Pa}$ Linearisation for a pressure loss smaller then dp_small dp_small

[1] $\mathrm{Modelica.Fluid.Dissipation.Utilities.Types.ValveGeometry.Ball}$

[2] $\mathrm{Modelica.Fluid.Dissipation.Utilities.Types.ValveCoefficient.AV}$

[3] $\frac{1}{400}\mathrm{\pi }$

[4] ${\mathrm{opening}}_{\mathrm{nominal}}\mathrm{Av}\sqrt{{\mathrm{\rho }}_{\mathrm{nominal}}{\mathrm{Δp}}_{\mathrm{nominal}}}$