Simscape Hydraulics, Flow rate does not go negative.

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Don Brohaugh
Don Brohaugh 2020-8-9
I am just starting to use the hydraulics sub-set of Simscape and have run into a problem. Perhaps a hydraulics sub-set user can help me out.
Attached is "simplehydraulicsytem.slx".
A sine wave reference supplies the position reference for a proportional valve spool position. Even though the reference swings both positive and negative, the flow rate is positive for both positive and negative reference values. Why?
What am I doing wrong? Any help wpould be appreciated.
Don Brohaugh

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