SpudFiles

I'm looking for an actuated valve.....

Working pressure: 200 psi.
Diameter: 6" minimum.
Actuating time: Between 1 and 4 seconds.

Anybody know of a source?

i hope u got some spare change for it?

maybe this
its all i could find

http://wardvalve.com.au/index.php?page= ... &Itemid=36

Could you maybe just get a large butterfly valve, and add a pneumatic cylinder?

D_Hall wrote:I'm looking for an actuated valve.....

Working pressure: 200 psi.
Diameter: 6" minimum.
Actuating time: Between 1 and 4 seconds.

Anybody know of a source?

I have a question. What is the application of the valve? For spudding, I like valves that open fully in under 10 ms. One second is several of orders of magnitude too slow for most air cannons, even pumpkin cannons.

I think its probably for venting on his large combustion or hybrid he's building, just a guess.

With your machine shop, I'd BUILD one.

That would probably be the best way....

Acutator;

http://www.c-a-m.com/content/products/p ... m?pid=3699

Valve;

http://www.c-a-m.com/content/products/p ... m?pid=2953

Probably overkill, but the size does limit your options. Customer service will be able to match them up for you, and likely ship as a complete unit.

Technician1002 wrote:I have a question. What is the application of the valve?

Control of a test specimen in a wind tunnel.


And having thought about the problem some more... I'm beginning to think the solution is ganging 20 2" QEVs. That gives FAST response as well as allows me to easily control flow by varying the number of valves turned on/off at any given time.

D_Hall wrote:

Technician1002 wrote:I have a question. What is the application of the valve?

Control of a test specimen in a wind tunnel.


And having thought about the problem some more... I'm beginning to think the solution is ganging 20 2" QEVs. That gives FAST response as well as allows me to easily control flow by varying the number of valves turned on/off at any given time.

For wind tunnel, I would recommend a VSD controlled compressor. The valves may work better if you already have a proper size compressor to run your tunnel. Will your air source provide enough supply to run QEV's. A high volume lower pressure application may be out the operating range of the QEV's. For wind tunnel, the QEV's may provide too much insertion loss into the stream for meeting your flow requirements.

http://www.sullair.com/corp/details/0,, ... 79,00.html

Is your air supply a centrifical compressor? If so a VVVF drive may solve the requirement for variable flow. This could provide a wider operating range than is possible with EQV's and in a closed loop control can provide a dial a MPH response for automated testing.

http://en.wikipedia.org/wiki/Variable-frequency_drive

VVVF drives are not very expensive realitively speaking.

Air supply is not a problem.

Control of the tunnel is not a problem.

I simply have a test article that has some interesting attributes and those attributes have pneumatic controls. Note that this is a one-off test so the "nicest" solution may not be the "best" solution as cost is a heavy driver here. Which is actually another reason (from my perspective) to go with the ganged solenoid valves. It may be a bit clunky, but it can be put together in no-time flat using low-lead-time parts. In my world, time is often more expensive than hardware so if I can buy 20 2" valves for $4k and have them shipped overnight, that's often better than if I found a (say) 6" valve for $1k (good luck) if that 6" valve has a 4 week lead time.

D_Hall wrote:

Technician1002 wrote:I have a question. What is the application of the valve?

Control of a test specimen in a wind tunnel.


And having thought about the problem some more... I'm beginning to think the solution is ganging 20 2" QEVs. That gives FAST response as well as allows me to easily control flow by varying the number of valves turned on/off at any given time.

Have you considered using pulse valves that are used in dust collection systems?
Example is ASCO 8353 series.

http://www.ascovalve.com/Common/PDFFile ... nPulse.pdf

Here is a 1.5 inch version;

That's what we're talking about.

A pulse valve and a QEV are the same thing just used by different industries. If you're cleaning out pipes, you call it a pulse valve. If you're relieving a pressure vessel, you call it a QEV.

But having visited Asco's site last night, I'm currently leaning towards 10 3" valves.

They are damn nice valves. I got 2 for $30 bucks off e-bay back awhile ago.

They only have a 125 psi rating. It may be marginal at 200psi.
150psi would probably be OK.

Do you plan on solenoid activation or remote air pilotting?

Solenoid activation. Well, probably solenoid activation of a 1" QEV that will act as a centralized trigger for one bank of them (I figure 2 banks IF I go this route).

And yeah, the 125 psi rating gives me some cause for pause. Thus why I say "IF" I go that route.