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Hammervalve question

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Hammervalve question

Unread postAuthor: The_Guerilla_Guy » Mon Jan 24, 2011 11:00 am

Hi guys, I'm back with another idea for a hammer valve:

Or maybe not even a hammer, but pushbutton first.

If you have a pipe with a tee at the end, the other going into the chamber and insert a screw with washer and seal in it, it will be really hard to push at high pressures, won't it?

But if you had the sealing part instead of a washer a conical design or like a bullet, there would be nearly no force applied to it, or am I wrong?
Nobody has ever tried such a cone, at least as far as I know, so I might have missunderstood something here?

greetings, Folks
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Re: Hammervalve question

Unread postAuthor: jackssmirkingrevenge » Mon Jan 24, 2011 11:12 am

The_Guerilla_Guy wrote:But if you had the sealing part instead of a washer a conical design or like a bullet, there would be nearly no force applied to it, or am I wrong?


It sounds like you're wrong, but I need a diagram to make sure :)
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Unread postAuthor: The_Guerilla_Guy » Mon Jan 24, 2011 11:33 am

Like this:
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 24, 2011 11:49 am

In that case, yes, you're wrong.

No matter what shape you put on the bolt, air resistance will be the same.

If you want zero air pressure on the bolt, it needs to be balanced, like a spool valve.

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Unread postAuthor: The_Guerilla_Guy » Mon Jan 24, 2011 11:52 am

Oh nice, thank you for that! Thats what I originally had planned, but some guys here said it wouldn't work^^

Edit: That would be pressable with a finger, no?
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Last edited by The_Guerilla_Guy on Mon Jan 24, 2011 11:54 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 24, 2011 11:53 am

The_Guerilla_Guy wrote:some guys here said it wouldn't work


They did? Show us who it was, so we may show them the righteous path!
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Unread postAuthor: The_Guerilla_Guy » Mon Jan 24, 2011 11:56 am

http://www.spudfiles.com/forums/inline-hv-t22157.html

At least its the basic principle, I combined the idea you yourself approved the thread before(:D) with this sorta no pressure version
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 24, 2011 11:57 am

Found it!

I'll reply there :D

That would be pressable with a finger, no?


Yes, all you would have to do is overcome the o-ring friction.

edit: damn you beat me to it :roll:
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Unread postAuthor: The_Guerilla_Guy » Mon Jan 24, 2011 12:37 pm

Funny thing, I was faster in searching than the grandmaster ;)

Nice, that gives a nice option for a trigger, cause I'm planning to build a underlever with a real underbarrel magazine, so the Air has to be stored in the back, so I can simply presss the trigger from the front. Nice, thanks a lot
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Unread postAuthor: Brian the brain » Mon Jan 24, 2011 4:13 pm

My push-button valve uses 1 O-ring and a flat washer.
This will generally mean less wear..

But the principle is to balance the two sides out so...that's basically the same.

But there is a downside to balancing out the valve: It won't be self-regulating anymore.

A normal hammer valve gets easier to open as the pressure drops, so it will open further or longer, wich means more gas can pass, wich in turn means the performance doesn't drop as much as it would with a balanced valve.

However, this is all relative to hammer weight, spring tension etc..
It can be a way of getting more consistent shots, if you get it all just right.

This is only important on a multi-shot cannon ofcourse...
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