EEV Electronic expansion valve

[wdrzal]

JFYI: look Wonder what this valve costs ???

http://www.globalcooling.com/EEV.html


Also look at their stirling cycle coolers. looks like a pot with a fan on top.

http://www.globalcooling.com/products.html

[teyber]

thats neat i wonder how much it costs also...

[marru]

Thats a great find, most eevs are available for high capacities, way higher that what we need. But uses the same principle as a Danfoss AKV which are more widely available.

[sjg0]

http://cgi.ebay.com/32GB402584-Elect...efaultDomain_0

Chump change.

[teyber]

http://cgi.ebay.com/32GB402584-Elect...efaultDomain_0

Chump change.

doesn't seem outrageous... for our application yes but i could have guessed a lot more then that

[sjg0]

doesn't seem outrageous... for our application yes but i could have guessed a lot more then that

True, but I could think of 100 better things to do with that kind of cash.

[wdrzal]

It's a electromagnet (solenoid) valve that the controller appears to be a simple transformer & 2 -556 duel timer IC's .

Because the valve & it's controller are simple,it may be affordable.

[SexyMF]

When I'm back home I will post a picture of the electronic valve I have to test. It is 0-10V input. Have not had a chance to look at it in detail but it is not PWM controlled.

Honestly I am surprised that nobody seems to use electronic valves, and people persist with expansion valves which are not designed for such relatively light loads.

[sjg0]

When I'm back home I will post a picture of the electronic valve I have to test. It is 0-10V input. Have not had a chance to look at it in detail but it is not PWM controlled.

Honestly I am surprised that nobody seems to use electronic valves, and people persist with expansion valves which are not designed for such relatively light loads.

Where did you get your EEV and how much was it?

[Athanatos]

you are looking at about $500 CAD minimum and the smallest i've seen is a 0.7 ton from emerson

[SexyMF]

I got mine for free from a plane. I'll post a picture on the weekend as I don't live at my house during the week.

[berkut]

Hi there guys,

I once experimented with automobile fuel injectors, you can buy ones with banjo fittings on the inlet and a copper oring on the outlet side. I don't think even adapting stock injectors would be any problem to you guys. They can be bought with a flow range between about 100cc/min to 1500cc/min, low and high ohm ratios (low about 4ohm and high about 16 ohm). They should work with temps down to -50C.

The test unit ran on R22/R290 single stage, a NE555 chip was used as the signal generator. At low temps and high head pressures the injector required more current to open and the pulse time couldn't be set to a high frequency. The system really could be tuned spot on for the given load, I was not smart enough to make a auto adapting controller tho... Also, i have no idea how long would a injector live in our systems, ran mine for only a few hours.

[Patrickclouds]

danfoss eev with integrated valve
http://cgi.ebay.de/ws/eBayISAPI.dll?...m=170313107763

[NotSoCoolJ]

Or you could servo control a CPEV. RC servos can be made to have full 360 rotation. I small stepper motor out of a printer would do as well if not better. There is tons of info on the internet about controlling servo motors and stepper motors with a PC.

[barbus]

Hi, I emailed global cooling a few days ago with regard to this EEV with the hope of getting my hands on one, but it appears that they are not an off the shelf item. They are not making them at present until they get a large order to make it worth while.