Temperature Control Valve

Festo do a lot of that kind of stuff. Worth a try.

I don't know about RTD sensors and I/P's on the valve, but self contained, capillary bulb temperature regulating valves have been around for a century or so.

http://www.jordanvalve.com/products/regulators/temperature

Exactly - about a century old (bio-tech customer isn't going to be thrilled with this) and definitely missing the "I" as in "indicating". Need a T read out too.

Here's the missing 'I'. Install one in a thermowell.

Seriously, how are you going to get from a resistance input (RTD) to a pneumatic output, with no other connections? There's no electrical power source (unless it's battery powered or uses an air-driven micro-turbine generator or something).

Here's a link to an RTD in, 4-20mA out temperature controller, but it requires loop power and the documentation is sparse:http://senseinstruments.en.alibaba.com/product/278563480-202921044/temperature_controller_199A.html

You mis-read the question - the device I am looking for, and I have seen it, looks like a standard valve mounted I/P, such as Fisher's DVC6200 with a TIC similar to a Red Lion T16, mounted in the same instrument case. No need for 2 devices, as both are built into one case. LED display/programmable PID curve/RTD to 4-20ma conversion/I to P all in one housing. Some ingenious company realized that almost all TCV valves need a TIC to run them - so why not put them together in one housing. The thing I don't remember is if it is NEMA 7. If it isn't I will still need the two devices. I know where to get the NEMA 7 I/P and can put the TIC in my main NEMA 7 box for the other control items with a window for the display. Just trying to simplify the wiring a bit.

OK. Must have been Leslie PMC-2. It doesn't appear to be NEMA 7. Here's a link:

http://www.lesliecontrols.com/catalogindex/PMC_2Page.pdf

Unless you need remote set-point or remote temperature indication, I don't see why you're avoiding the non-electric route. Must be one of those young pups I keep hearing about . Here's a link to a pneumatic TIC (this one has the indicator built in):

http://www.bbinstruments.com/downloads/Model_40.pdf

Yeah - that's the idea, but it is only NEMA 4. May use this on other skids.

Young pup? The first go round at higher education, I studied tubes in college - transisitors were a new novelty. The pharma / bio-tech industry hasn't used pneumatic controls in several decades and I am hesitant to suggest it to them. (however we are looking at a wind up temperature recorder right now for them) Last time I suggested Spirax/Sarco's capillary controlled valve for steam to a heat exchanger I got a very big NO.

Not too good at keeping cards - drag them home and my wife always file 13's them.