Relief valve with opening area linearly dependent on pressure difference
The Relief Valve component models a hydraulic relief valve as a sharp-edge orifice with the orifice area dependent on the pressure across the valve.
The area varies linearly from Aclosed to Aopen as the pressure varies from pclosed to popen, and remains at the endpoints for pressures outside this range.
Based on the orifice area, the pressure vs flow rate relationships are derived by the formulation used in the Orifice component.
The boolean parameters Use volume A and Use volume B, when true, add optional volumes VA and VB to ports A and B, respectively. See Port Volumes for details.
If two orfices or valves are connected, enabling a volume at the common port reduces the the stiffness of the system and improves the solvability.
Upstream hydraulic port
Downstream hydraulic port
Reynolds number at critical flow
Pressure at which valve is fully closed (A=Aclosed)
Pressure at which valve is fully open (A = A_open)
Valve area when fully open
Valve area when closed (leakage)
Use volume A
When true a hydraulic volume chamber is added to portA
Volume of chamber A
Use volume B
When true a hydraulic volume chamber is added to portB
Volume of chamber B
For more information see Port Volumes.
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