Instrumentation of existing Manual Valves

Josh_10

Are you trying to retro-fitt existing valves or replace them?

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Richard Froelich

Valve position

I have several hundred existing manual valves (Mostly globe valves) that I need to instrument to determine the actual valve position. In an ideal world it would nice to have a 0-10 volt output representing valve position. The output of these valves will be connected to a computer system.

I also have some butterfly valves

Brad White_9

Nothing unusual

This is done all the time, Richard. Most DDC systems have feedback valve position data as a function of their proportional signal.

Just do not confuse this with valve "output" for globe valves are anything but linear. 50% open might mean 90% of flow for example.

Brad White_101

Fair point, Josh...

I missed the obvious point that he has existing globe valves while control-type globe valves use a piston-type stroke, not a rotary one. I suppose you could still get actuators of the rotary type with proportional I/O's... What do you think?

Josh_10

Well I guess it depends on alot of things I guess. Brands, types, and how much work one is willing to put forth. Sounds like alot of work either way!

I am curious though as to what our friend is doing! Can you explain the project? Seems like quite an undertaking. Are you trying to get a proof of closure for the valves or measure flow? Perhaps differential pressure orifice type sensing devices might serve your purpose better?

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