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Destroyer Valve MKII [POWER TESTS 9/6/09]

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: kiwi of nitro » Tue May 05, 2009 1:16 am

Call it the Mutilator.
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Unread postAuthor: POLAND_SPUD » Tue May 05, 2009 2:46 am

no offence but there are a few commercially available valves like this and they are of much higher quality...

maybe you should try something different - for example an all metal 1.5" piston valve or something like that

well that's just my suggestion - I don't know whether it would be economical to build it and sell it
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Unread postAuthor: Biopyro » Tue May 05, 2009 4:08 am

Gaderelguitarist wrote:As for marketing this...
Large flow piston valves are already being sold successfully. You'll find it difficult to enter the market unless you begin with a price lower than $30 USD, or your valve ends up having remarkable performance.


Spudding supplies in the UK are considerably more expensive, not to mention nowhere sells them. If you want to buy from the US for $30 dorllars, that's all good but then there is postage to consider. I'm sure he won't find much market in the US, but in the UK it may be another story.


If it is neatened up, it is quite possible that it would sell to novices.
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Unread postAuthor: Technician1002 » Tue May 05, 2009 5:10 am

Jogumpie wrote:how about the Better-Than-The-Supah-And-Mauler-And-Batman-Put-Together valve?



Is that a valve name or just a description of mine? :D
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Unread postAuthor: Willdebeers » Tue May 05, 2009 12:43 pm

The final version will be way neater and will look so much nicer. :D

Price will be £25

There might be a bigger one with a 50mm port in a 63mm tee.

How about "Vaporizer" as a name for this bigger valve? :roll:
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Unread postAuthor: Biopyro » Tue May 05, 2009 1:07 pm

Lol technician!

Vaporiser and atomiser?

That's a good price, I think I'd buy one if I hadn't got halfway through mine!

Selling a valve doesn't have any legal issues like selling a whole cannon, but you'll need to work on a way to sell it to the uninitiated because they might not be able to figure out how to turn a valve into a cannon!

Good to hear the final version will be neater, but I'm not 100% convinced that pilot area needs to be that big.
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Unread postAuthor: Willdebeers » Wed May 13, 2009 2:26 pm

Thats where the piston slides.

DESIGN CHANGE!

it now all fits inside a 63mm (2.5") tee, with a 50mm (2") porting, and 1" threaded pilot.


Price £40-£50 (sorry, but the parts alone are £21.50, and the piston is UBER, with check valves and o-rings.)

Mauler copy? you bet. :D just kidding. :wink:
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Unread postAuthor: Biopyro » Wed May 13, 2009 2:36 pm

Brilliant - any pictures? Is it no longer possible for you to make the smaller size one? What's the piston material?
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Unread postAuthor: Willdebeers » Wed May 13, 2009 3:23 pm

Piston is nylon, but i need to refine it to get it perfect. soz, my cameras broken. The reason for the large size is so it can have a large porting, plus it looks cooler. 8)
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Unread postAuthor: Willdebeers » Wed May 13, 2009 3:36 pm

Here is a pic of the new nylon piston, with "unique" sealing face.
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Unread postAuthor: Technician1002 » Wed May 13, 2009 7:24 pm

Jogumpie wrote:Here is a pic of the new nylon piston, with "unique" sealing face.


The squishy foam has 2 problems.

1) Getting a good seal with the waffle pattern to pressurize the chamber can be difficult to get a seal before pressure is enough to flatten it.

2) The soft foam is open cell so gas leaks through it and may get torn off when fired.

A smooth flat hard rubber washer may be a better choice, especially at higher pressures. You may want to test the product and be sure of the reliability.

Performance videos are good.
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Unread postAuthor: jmccalip » Wed May 13, 2009 8:47 pm

Technician1002 wrote:
Jogumpie wrote:Here is a pic of the new nylon piston, with "unique" sealing face.


The squishy foam has 2 problems.

1) Getting a good seal with the waffle pattern to pressurize the chamber can be difficult to get a seal before pressure is enough to flatten it.

2) The soft foam is open cell so gas leaks through it and may get torn off when fired.

A smooth flat hard rubber washer may be a better choice, especially at higher pressures. You may want to test the product and be sure of the reliability.

Performance videos are good.


x2


I used this as my sealing face on my 3" piston:

Ultra-soft Polyurethane Sheet, 1/4" Thick, 4" X 4", 70 Oo Durometer


And it worked perfectly up until 40 PSI. Then after a few shots it was torn apart. I've been using a cheapo 1/8" neoprene fender washer found at the hardware store, and it's been working great ever since.
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Unread postAuthor: Willdebeers » Thu May 14, 2009 11:43 am

Ok, i'll look into sealing face alternatives.
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Unread postAuthor: Technician1002 » Thu May 14, 2009 1:26 pm

Jogumpie wrote:Ok, i'll look into sealing face alternatives.


Even a piece cut from an inner tube would work better, but often this is not perfectly flat and smooth. If you are in the US, hit some True Value hardware stores. Some have sheet neoprene rubber by the sheet.

EDIT Promised photo added of neoprene at 70 cents/lb.

I need to get my glasses fixed. I didn't pay enough attention. I added some other stuff at 70 cents. It's a pound of neoprene at 3.50/lb.
:oops:
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Sheet neoprene from my local hardware store priced per pound.
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Price slip from True Value hardware store. 3.50/lb.
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Last edited by Technician1002 on Thu May 14, 2009 4:15 pm, edited 2 times in total.
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Unread postAuthor: Biopyro » Thu May 14, 2009 1:33 pm

I could NEVER find small amounts of neoprene or similar in the UK. I asked in 3 auto stores, and asked a few ebay sellers for samples, but had no luck.
I used inner tube in the end, with a penny washer to keep it from curling off the piston face.
I guess if you're going to be making a few, you could get a sheet though.
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