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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: deathbyDWV » Sun May 17, 2009 10:43 am

Good idea of selling a pre-made piston valve to anyone who can't make their own. Personally i don't like buying pre-made stuff even if i can't get something to work the first time. Just getting to build it is half the fun for me.
PS: check out my name and make sure your parts aren't DWV!!!
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Unread postAuthor: Willdebeers » Sun May 17, 2009 2:03 pm

Because of the parts avalible and the design it has to have 1.5" porting. But what about MrCrowley's piston valve? That was 50mm- 40mm.
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Unread postAuthor: Willdebeers » Fri May 29, 2009 8:00 am

MKII is here!

The valve turned out better than expected, and I should have damage shots as soon as I can get a good chamber and barrel.

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Unread postAuthor: thedeathofall » Fri May 29, 2009 10:51 am

wow, that looks pretty good. I can see you spent time actually finding the right parts.

Get some test shots and make a few more prototypes, and then we'll see how good it really is.
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Unread postAuthor: Willdebeers » Fri May 29, 2009 10:54 am

yeah, the first one was just to see if the concept works. I'm having a bit of a problem though, The piston only can slide back 1/4". the porting is 1.5", so is this enough? Is it to restricting?
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Unread postAuthor: thedeathofall » Fri May 29, 2009 11:06 am

Well for a piston that large I might recommend a little bit more. 0.5-0.75 inches would be more than enough. 0.25 inch will be fine though.

If you do find it overly restricting, then you know what to do for the next prototype :roll:
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Unread postAuthor: Technician1002 » Fri May 29, 2009 11:53 am

Jogumpie wrote:yeah, the first one was just to see if the concept works. I'm having a bit of a problem though, The piston only can slide back 1/4". the porting is 1.5", so is this enough? Is it to restricting?


It is restricting. The minimum is about 1/4 the diameter of the port. In the 1.5 port a .375 is minimum. Can you adjust the length of the piston?

To prevent a double restriction of the piston opening and valve seat, I aim for the opening to be about 1/2 the seat diameter so the seat is the only real restriction.

Those measurement only apply to valves where the air is able to enter from all sides. Ones built inside a T where 3/4 of the sides of the piston are not a port, the distance needs to be larger so the area is not restricted to the valve seat. It is why I like coaxial designs. The less distance a piston has to move out of the way, the faster it is all the way open.
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Unread postAuthor: Willdebeers » Sat May 30, 2009 2:23 am

Well I modified the piston and it now opens 3/4".

By the way, I have never dealed with 16bar pipe before, its really thick. :shock:
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Unread postAuthor: Biopyro » Sat May 30, 2009 2:56 am

Wow, sounds really good. Very nice and neat too! How are you arranging the pilot setup?
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Unread postAuthor: Willdebeers » Sat May 30, 2009 3:17 am

Its basically the same as Sean's setup. (QEV, Blowgun, quick disconnect etc...)

I still havent decided the final price though.


EDIT: Btw biopyro, is your QDV done yet? :D

oh yeah, here are some moar pics:

Piston open:
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Piston closed:
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Parts needed to build it:
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Enjoy! :D
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Unread postAuthor: Biopyro » Sat May 30, 2009 12:59 pm

Very nice and neat!

Not quite. I'm finding the piston verrry tight still. Just need to make the vent ports reeeally smooth. What size were the o-rings on it btw? I cut one of them a little, and I think it needs replacing. I've bought the shock pump for it, should be here by next week.
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Unread postAuthor: Willdebeers » Sat May 30, 2009 2:14 pm

13mm. They were quite strechy though. Try smaller ones. It should work better.

EDIT: MKII went to a photoshoot today! Here are some pics. These will be used in the promotional.

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Enjoy!
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Unread postAuthor: Willdebeers » Sun Jun 07, 2009 3:51 pm

Oops! Ignore this.
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Unread postAuthor: Biopyro » Sun Jun 07, 2009 4:00 pm

Damage pics will be a crucial seller! Where are they? Looks really nice though, I can't wait to see how it performs!
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Unread postAuthor: Willdebeers » Tue Jun 09, 2009 10:40 am

Finally got some damage pics! I'll upload them in a sec. Just need to find that cord...

By the way, this thing is way more powerful than I thought it would be, decimating 3/4" particle board.
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