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HVAC Actuator controls (4-20mA or 0-10V?)

Subject: HVAC Actuator controls (4-20mA or 0-10V?)
From: rush <rushik77@xxxxxxxxx>
Date: Fri, 29 Jun 2007 10:54:12 -0700
Newsgroups: comp.home.automation

I am trying to understand why certain flow actuators require a current
signal as opposed to the standard 0-10V voltage signal.

Is this something left over from historic applications or is there a
real benefit for current controlled valves?
(run a single wire through all valves to be controlled, no voltage
drops to worry about etc?)

Any thoughts?

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- Re: HVAC Actuator controls (4-20mA or 0-10V?)
  - From: Steve in San Marcos

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