SpudFiles

With you're budget and facilities you could build a 6" all steel supah/mauler type valve to fit your specs quite handily I would imagine...

D_Hall wrote: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.

Speaking of ASCO valves, what ever became of this project?

http://www.spudfiles.com/forums/interes ... 17574.html

Any update to this posting would be interesting!

If you want 3D CAD drawings of this valve let me know.

jeepkahn wrote:With you're budget and facilities you could build a 6" all steel supah/mauler type valve to fit your specs quite handily I would imagine...

Wow, that would be cool. but the costs would be astronomical...

Willdebeers wrote:

jeepkahn wrote:With you're budget and facilities you could build a 6" all steel supah/mauler type valve to fit your specs quite handily I would imagine...

Wow, that would be cool. but the costs would be astronomical...

for the pressures he's wanting, they could be built prolly for less than $100 by an individual, but that equates to $10,000 if the taxpayers are covering it...lol

dewey-1 wrote:

D_Hall wrote: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.

Speaking of ASCO valves, what ever became of this project?

http://www.spudfiles.com/forums/interes ... 17574.html

Any update to this posting would be interesting!

It's sitting in my garage awaiting installation of the pilot valve. Everything else is done... But I've been getting my gun jollies from Vera as late so I haven't been inspired to finish it.

jeepkahn wrote:for the pressures he's wanting, they could be built prolly for less than $100 by an individual, but that equates to $10,000 if the taxpayers are covering it...lol

Well, given that a failure of the valve(s) in question would cost about $250,000? Yeah, I'm willing to spend a bit more to have a proper engineering analysis and such performed.

D_Hall wrote:

jeepkahn wrote:for the pressures he's wanting, they could be built prolly for less than $100 by an individual, but that equates to $10,000 if the taxpayers are covering it...lol

Well, given that a failure of the valve(s) in question would cost about $250,000? Yeah, I'm willing to spend a bit more to have a proper engineering analysis and such performed.

Or you could just overbuild to the degree that there is almost zero chance of failure. That would be cheaper, and take less time.


I second the ball valve, only with a leadscrew-type actuator. 8 TPI would allow reasonably fast actuation. 12" travel in 4 seconds would require 24 rpm. 24" in 1 second would need 192, which is still very doable. The problem is that 8TPI isn't available until 1" OD threaded rod...

And if that really conservative valve that you didn't take the time to analyze takes 6 seconds to open, and not 5.... That'll be $250,000 please. We get ONE shot at this. If it doesn't work absolutely perfectly the first time, game over. There are no second chances.

We HAVE 6" ball valves lying around. Several of them, actually. I don't trust any of them to actuate on the timelines I need. We just don't find them to be that repeatable.

God, I wish I knew what you were doing. That would make helping you so much easier, although I can speculate...

as far as my over-built valve, It could be tested while not connected to this $250,000 thing. If it takes 6 seconds, just apply more power to whatever is opening it until it opens in 5.

but that isn't solving your problem (unless you listen ). What about multiple ball valves in parallel. A separate actuator/button/powersupply/gravity field for each. Push 3 buttons, all 3 valves open. One jams, one gets smited, you still have one that opened.

D_Hall wrote:

jeepkahn wrote:for the pressures he's wanting, they could be built prolly for less than $100 by an individual, but that equates to $10,000 if the taxpayers are covering it...lol

Well, given that a failure of the valve(s) in question would cost about $250,000? Yeah, I'm willing to spend a bit more to have a proper engineering analysis and such performed.

But you understand what I'm saying... Considering the cost of a failure, it would be prudent to build a valve to do exactly what you want as opposed to buying a valve... Again, if we knew what role the valve was playing, it would help the suggestors...

Is it a safety vent, is it a fill valve, is it a fueling valve, etc...

There will be an explosion.

The valve(s) will be commanded to open. Note that the valves can NOT begin to open until the first explosion happens.

5-6 seconds later, there will be a second explosion.

If the valves have not fully opened by the time of the second explosion, all hell brakes lose.

Clear as mud?

If the valve opening is commanded by an outside input(an operator) and has to occur within 5 seconds of the seconds of the first bang, thenmy reccomendation would be a pneumaticly actuated ballvalve...

use a pneumatic cylinder with a pressure resorvoir on one side and a piloted qev on the opposing port... Basically using the rezzie side as a large air spring to push the rod and valve lever open, and using the qev side as the closing force on the valve lever... This is exactly the type of process that QEV's were designed for... And the rezzie side will never lose air unless you have a seperate manual vent for it...

Clear as Vodka???

As I said... We have large actuated ball valves just lying around this place. We have a fair amount of experience with them, actually. In our experience, they do not open quickly. We do NOT trust them for this operation.

Well... Ya'll should be happy.

After the Big Meeting today it was decided to build....

[drum roll please]

Two (count 'em, two!), 6" piston valves.

Can I borrow one for use as the pilot valve on the Punkin'Chunker???



please...