Piezo and Torquemotor based Valve positioners

A

Thread Starter

AS

Hi,

I am curious to understand smart Valve Positioner basics. Pl advise me on properties of Torque Motor and Piezo based positioners. On what Criterion manufacturers use certain manufacturers use Piezo or torque motor? What is spool valve in a Valve positioners? How does an positioner achieve Fail Freeze?
 
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