[SML] Cannon burst from air cannon

[Jon Lagerquist]

Here is a link to literature for a Goyen valve.

https://www.dropbox.com/scl/fi/2gusoe0mtgbyviimubeaj/Goyen_Diaphragm_Valves_unlocked.pdf?rlkey=knzjfvc4rutzqgqyjtm6tzxoj&st=00iq8s1z&dl=0

It was so far back that I do not remember where I got them, but McMaster 
might be an option. We built a couple of different size units using 
valves with a 3/4" and 1.5" ports. These are air piloted, so we used a 
small solenoid valve to release the air and fire the unit.

These are to release the air from the tank to the tube. It sounds like 
you may be looking for a way to remotely reset the cap on the end of the 
tube. Perhaps something that is hinged and has a friction fit which 
could be reset by a spring return cylinder, using the spring return 
lowers the chance that the cap is held in place. A timer relay in the 
circuit can prevent the reset switch from being held closed, or you 
could wire it to retract with the operation of the main valve.

Jon


On 12/9/2025 10:40 AM, Joe via Stagecraft wrote:
> First, it is good that Jerry Durand reminded folks about the explosion 
> risks with PVC pipe.  I reminded the folks working with me about that, 
> so I at least reduced the temptation to see how loud they can make it.  
> I accidentally created a safety feature on my system by using a bicycle 
> pump that was designed for higher volume and lower pressure. Taking it 
> to 70psi was the maximum they had enough weight to pump.
> 
> I understand the Cv rating (resistance to air flow).  When I searched 
> for blast valves for dust collection systems.  However, all the ones I 
> found were ball, or knife-gate valves.  None automatically opened at a 
> certain pressure, or reset. They were simply valves to direct the air 
> flow to the tool being used.  I am puzzled why they called them blast 
> valves.
> 
> Here is a quick sketch of how I might imagine a type of resettable high 
> pressure valve might work.  Structurally, it is like the air outlet of 
> your clothes dryer, or bathroom exhaust fan. However, I added a magnet 
> to hold the flap closed until pressure exceeds its holding power. The 
> spring loaded hinge on the flap would then close the flap, so it can be 
> used again.
> Inline image
> 
> 
> But, I can't find any type of air valve like this, or that is designed 
> for releasing at a fairly high pressure (i.e. 60psi).
> 
> Jon, can you provide a link to the type of valve you were talking about?
> 
> -Joe
> 
> 
> On Monday, December 8, 2025 at 11:39:25 PM EST, Jon Lagerquist via 
> Stagecraft <stagecraft at theatrical.net> wrote:
> For valves I found that "blast valves" designed to clean dust collection 
> systems do a great job. I remember them having a CV of about 50.this 
> means they are making a big hole very fast so lots of air moves quickly, 
> producing a good sound with or without a cap.
> 
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-- 
Jon Lagerquist
--