Shuttle Valve

Shuttle valve with pressure bias

 Description The Shuttle Valve component allows flow out of port C from the either port A or port B, depending which has the higher pressure. Based on the orifice area, the pressure vs. flow rate relationship is calculated by the formulation used in the Orifice component. The boolean parameters Use volume A, Use volume B, and Use volume C, when true, add optional volumes ${V}_{A}$, ${V}_{B}$, and ${V}_{C}$ to ports A, B, and C, respectively.

Connections

 Name Description Modelica ID $\mathrm{portA}$ Hydraulic port of left inlet portA $\mathrm{portB}$ Hydraulic port of right inlet portB $\mathrm{portC}$ Hydraulic port of bottom outlet portC

Parameters

General

 Name Default Units Description Modelica ID ${p}_{\mathrm{open}}$ $1·{10}^{4}$ $\mathrm{Pa}$ Pressure difference to make one side fully open popen ${A}_{\mathrm{close}}$ $1·{10}^{-12}$ ${m}^{2}$ Orifice area when closed (leakage) Aclose ${A}_{\mathrm{open}}$ $1·{10}^{-5}$ ${m}^{2}$ Orifice area when fully open Aopen $\mathrm{Exact}$ $\mathrm{false}$ True (checked) means a first-order dynamics is used for the valve areas Exact ${t}_{c}$ $0.1$ $s$ Time constant tc $\mathrm{Use constant Cd}$ $\mathrm{true}$ True (checked) means a constant coefficient of discharge is implemented, otherwise a variable ${C}_{d}$ is used in flow calculation UseConstantCd ${C}_{d}$ $0.7$ Flow-discharge coefficient; used when $\mathrm{Use constant Cd}$ is true Cd ${\mathrm{\Re }}_{\mathrm{Cr}}$ $12$ Reynolds number at critical flow; used when $\mathrm{Use constant Cd}$ is true ReCr ${C}_{d\left(\mathrm{max}\right)}$ $0.7$ Maximum flow-discharge coefficient; used when $\mathrm{Use constant Cd}$ is false Cd_max ${\mathrm{Crit}}_{\mathrm{no}}$ $1000$ Critical flow number; used when $\mathrm{Use constant Cd}$ is false Crit_no

Optional Volumes

 Name Default Units Description Modelica ID Use volume A $\mathrm{false}$ True (checked) means a hydraulic volume chamber is added to portA useVolumeA ${V}_{A}$ $1·{10}^{-6}$ ${m}^{3}$ Volume of chamber A Va Use volume B $\mathrm{false}$ True (checked) means a hydraulic volume chamber is added to portB useVolumeB ${V}_{B}$ $1·{10}^{-6}$ ${m}^{3}$ Volume of chamber B Vb Use volume C $\mathrm{false}$ True (checked) means a hydraulic volume chamber is added to portC useVolumeC ${V}_{C}$ $1·{10}^{-6}$ ${m}^{3}$ Volume of chamber C Vc