"Leak proof" expansion valve

[Monty]

Does anyone know were I can find one and who makes it. I believe it has a magnetic motor drive and therefore no seals. I know they are available but can't find any reference to them on the internet.

Thanks

Monty

[Grizzly]

Monty.
The nearest I can get to what you describe, is the new Danfoss ICM valves with ICAD Actuators.

Quote from their literature
"
ICM valves are designed to regulate an expansion
process in liquid lines with or without phase
change or control pressure or temperature in
dry and wet suction lines and hot gas lines.
ICM valves are designed so that the opening
and closing forces are balanced, therefore, only
two sizes of ICAD actuators are needed for the
complete range of ICM from DN 20 to DN 65. The
ICM motorised valve and ICAD actuator assembly
offers a very compact unit with small dimensions"


The ones we have used have been very successful.
Provided you remember to fit a UPS Supply. To power the valve shut in the event of power failure.
Cheers Grizzly

[Brian_UK]

I think that all valves of that type will have a seal somewhere.

The electric drive has to push a spindle up and down somehow and that spindle connects 'in' with 'out'.

[Grizzly]

Brian.
These don't operate like any other
They have a magnetic drive.
A bit like the old SMC (I think thats the brand?) Central heating pumps.
The valve is driven by a very strong magnetic. With a bore just slightly larger than the cylindrical valve spindle, which it sits over!
Within the installation kit there is a magnet that you can drop over the valve, (should the actuator fail!)
To enable the valve to be manually set.
These are primarily for larger Industrial applications where say a PM valve would of been used historically.

So although they are described as a Expansion Valve. I would refer to them as a regulating valve.
One and the same in the eyes of some I know.
But I like you would be thinking of something a bit smaller.
These are not to be confused with the thermostatic exp. valve.
Cheers Grizzly

[nh3wizard]

Grizzly do they work like the slide valve indicator on Sabroe compressors?

[Grizzly]

Grizzly do they work like the slide valve indicator on Sabroe compressors?

Yo Wiz.
I get where you are coming from!
Follow the link below and this will lead to the Danfoss website relating to these brilliant valves.
Basically danfoss as you know used to do 2 styles of valves.
1 for Freons,
1 for Ammonia,
Then Co2 entered the arena.
So instead of developing a 3rd style valve they
designed a "1 valve for all systems"!
As I have said earlier so far I, and my Industrial colleagues are very impressed with them!

http://www.danfoss.com/Products/ProductFinder/ProductFinder.htm?segment=RA&category=http%3a%2f%2fRA.danfoss.com%2fra%2fProducts%2fProductCatalogue.asp%3fNavigation%3dHideOnAll Pages%26Footer%3dHideonallpages%26Division%3dRC%26HL%3d3%26HLID%3d980&AppID={c2a95dac-5e01-47df-92cd-5972d837cf1a}


1st picture shows the actuator which you can set to read the percentage open of the valve at any given time.
2nd Is the valve complete without the actuator fitted.
And lastly is the magnetic tool which enables manual adjustment of the valve!

Cheers Grizzly

Monty sorry for hijacking your post. Just trying to explain what I meant in my reply.
Was this of any use to you?

[Brian_UK]

OK, got ya.

You learn a little every day, I'm glad to say. :)

[nh3wizard]

Ill have to dig around and see if I have the information but I believe Hansen and Parker have something similar.