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History of the Valve Positioner

History of the Valve Positioner

History of the Valve Positioner

(OP)
I posted this last year, and got no responses. So I'm gonna' try again.

 2 Feb 05 13:08  
I am interested in finding out who offered the first valve positioner.  The oldest literature I have seen shows the Moore 72.  Positioners probably "evolved" more than just appearing in a flash of inspiration, and I'm really curious about the time-line.  

RE: History of the Valve Positioner

I wonder if they started life as valve positioners, or were first developed as position indicators and were later applied to valves.
yours

RE: History of the Valve Positioner

(OP)
Pilot-actuated regulators have been available for a long time.  Changing the setpoint sprinig to a dome-loader would then accept a remote control signal. Still, regulators measure the downstream ressure in comparison to a control signal.

 But when did the device come along that compared the control signal to the stem  position?  I'd really like a link to be able to access detailed info about the first posiotioner(s).

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