Search found 11 matches

by getgray
Wed Sep 21, 2022 4:39 pm
Forum: Pneumatic Cannons
Topic: Valve selection
Replies: 10
Views: 379

Re: Valve selection

First, thanks for the help on this. (and for that rehost of the image). re chamber volume: I just set it the same as the barrel for a start point. I'd like to keep the pressure low but the a smaller barrel will save on costs so I'll work to balance it once I get a feel for how the valve will do. I p...
by getgray
Tue Sep 20, 2022 12:29 am
Forum: Pneumatic Cannons
Topic: Valve selection
Replies: 10
Views: 379

Re: Valve selection

Thank you. I have the valve in hand now. It's a beast visually. They don't publish a Cv for it because they said Cv is generally applied to valves with "continous flow" and this one is a pulse so didn't typically apply. Rep has some approximate Cv's which were pretty high, and he's inquired with Jap...
by getgray
Fri Sep 16, 2022 9:29 am
Forum: Pneumatic Cannons
Topic: Valve selection
Replies: 10
Views: 379

Re: Valve selection

Building one would be my last resort. I've got a small metal lathe and might be able to muddle through it, but I prefer a off-the shelf solution. If I made it, I need to make so I can use in metal, air pressure safe parts. Need is very soon. We can't proceed with the overall project until we know wh...
by getgray
Thu Sep 08, 2022 4:25 pm
Forum: Pneumatic Cannons
Topic: Pulse, QEV vs GGDT
Replies: 1
Views: 131

Pulse, QEV vs GGDT

For an off-the shelf valve, I gather the QEV (old threads imply harder to get) and the Pulse dust clearing valves (e.g. those from Asco) are good options. But I have been unable to figure out how to model them in GGDT. Anyone have any sample parameters they can share? Are these both Chamber seal typ...
by getgray
Thu Sep 08, 2022 1:42 pm
Forum: Pneumatic Cannons
Topic: Valve selection
Replies: 10
Views: 379

Re: Valve selection

Building launcher for t-shirts. Rolled up. And yes, I would prefer to purchase a valve. A lot of times the larger companies will donate parts like that to kids robotics teams. I've reached out to SMC and Asco for a similar one they make. They both have high Kv values relatively speaking I think, but...
by getgray
Thu Sep 08, 2022 1:06 pm
Forum: Pneumatic Cannons
Topic: Access Old Threads?
Replies: 5
Views: 238

Re: Access Old Threads?

Thank you. I see what you did on that one. Appreciate it.
by getgray
Wed Sep 07, 2022 9:48 pm
Forum: Pneumatic Cannons
Topic: Valve selection
Replies: 10
Views: 379

Re: Valve selection

What about these? They look like nice, fast valves. "Dust Collector, Pulse Valve, Series JSXFA" What valve type would one use to model them in GGDT? Chamber seal I think, but grateful for some verification. Company link: https://www.smcusa.com/products/JSXFA-2-Port-Dust-Collector-Pulse-Valve~161147 ...
by getgray
Wed Sep 07, 2022 8:36 pm
Forum: Pneumatic Cannons
Topic: A tale of two valves
Replies: 7
Views: 4733

Re: A tale of two valves

Anyone know how to mode a QEV in GGDT?
by getgray
Wed Sep 07, 2022 10:44 am
Forum: Pneumatic Cannons
Topic: Valve selection
Replies: 10
Views: 379

Re: Valve selection

Anyone know what I should use for a "pulse valve" in GGDT's valve parameters? They seem to be an option for fast high flow valves?
by getgray
Wed Sep 07, 2022 10:32 am
Forum: Pneumatic Cannons
Topic: Access Old Threads?
Replies: 5
Views: 238

Access Old Threads?

As I try to do some research here I get a lot of internal thread links that don't work. I've seen that on other forums where they update their software. Are there any tricks to access that old information or links?

e.g.:
No route found for "GET /forums/valve-trouble-t14475.html"
by getgray
Tue Sep 06, 2022 5:17 pm
Forum: Pneumatic Cannons
Topic: Valve selection
Replies: 10
Views: 379

Valve selection

I'm working on helping a high school robotics team update their T-shirt cannon. They have been directed to move to metal parts away from PVC. I've got a copy of the GGDT and I'm fuzzy on the valve selections; chamber sealing pilot, barrel sealing pilot, burst disc Are any of these available in a 1" ...