Check Valve Two $—$ Spring-loaded check valve with laminar/turbulent flow

The Check Valve Two component describes a spring-loaded check valve with laminar/turbulent flow. The resistance depends on the pressure differential, $\mathrm{Δp}={p}_{A}-{p}_{B}$:

 $\mathrm{Δp}<{p}_{\mathrm{open}}$ Leakage from high pressure port to low pressure port only. $q=\mathrm{Δp}{G}_{\mathrm{leak}}$ ${p}_{\mathrm{open}}<\mathrm{Δp}$ Valve is wide open. Flow mode depends on Reynolds number. Resistance modeled as an orifice in parallel with laminar resistance.

In some cases it is either necessary or helpful to include the dynamics of a check valve: the poppet needs some time to close or open the flow path. This effect is modeled by a first order system. The parameter tau_ball (found in the General section under the Inspector tab) gives the time to open or close the valve 95%.

The mass and flow forces are not included. Use the modifier(s)

VolumeA(port_A(p(start=1e5,fixed=true)))

and/or

VolumeB(port_A(p(start=1e5,fixed=true)))

to set the initial condition(s) for the pressure of the lumped volume(s) $\left[\mathrm{Pa}\right]$.

Related Components

 Name Description Spring-loaded check valve with laminar/turbulent flow (different characteristic) Ideal spring-loaded check valve with laminar/turbulent flow, additional information

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

Parameters

General Parameters

 Name Default Units Description Modelica ID ${\mathrm{ΔT}}_{\mathrm{system}}$ $0$ $K$ Temperature offset from system temperature dT_system use volume A $\mathrm{true}$ If true, a volume is present at port_A useVolumeA use volume B $\mathrm{true}$ If true, a volume is present at port_B useVolumeB ${V}_{A}$ ${10}^{-6}$ ${m}^{3}$ Geometric volume at port A volumeA ${V}_{B}$ ${10}^{-6}$ ${m}^{3}$ Geometric volume at port B volumeB $d$ $0.001$ $m$ Diameter of equivalent orifice diameter $\mathrm{area}$ $0.001$ ${m}^{2}$ Area of the equivalent orifice area ${k}_{1}$ $10$ Laminar part of orifice model k1 ${k}_{2}$ $2$ Turbulent part of orifice model, ${k}_{2}=\frac{1}{{C}_{d}^{2}}$ k2 ${C}_{d}$ $0.707$ Max discharge coefficient C_d ${\mathrm{\lambda }}_{c}$ $\frac{2{k}_{1}}{\sqrt{{k}_{2}}}$ Critical flow number lambdac ${G}_{\mathrm{leak}}$ ${10}^{-12}$ $\frac{{m}^{3}}{s\mathrm{Pa}}$ Conductance of leakage GLeak ${p}_{\mathrm{nom}}$ ${10}^{6}$ $\mathrm{Pa}$ Nominal pressure drop pnom ${q}_{\mathrm{nom}}$ $1.89·{10}^{-5}$ $\frac{{m}^{3}}{s}$ Nominal volume flow rate qnom ${\mathrm{\rho }}_{\mathrm{nom}}$ $865$ $\frac{\mathrm{kg}}{{m}^{3}}$ Nominal density rhonom ${p}_{\mathrm{open}}$ $1.25·{10}^{5}$ $\mathrm{Pa}$ Transition pressure popen $\mathrm{orif}$ $1$ Orifice dimension orif $\mathrm{Transition}$ $1$ Transition model Transition ${\mathrm{\tau }}_{\mathrm{ball}}$ $0$ $s$ Time to open or close check valve 95 % tau_ball