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| iknowmy3tables |
 Posted: 11/10/2007 16:37 PM Post subject: valve hybrid design |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1133
2685.49 Spud Bux
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I recently met a friend at school who builds spud guns he has an interesting idea for a non burst disk hybrid. It's quite simple a solenoid valve replaces the burst disk and the ignition is wired to go off simultaneously with the valve
I'm not sure about it cause I don't know if the valve will open fast enough to do any thing |
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| ALIHISGREAT |
| Posted: 11/10/2007 16:43 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
Posts: 1311
1007.17 Spud Bux
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| burst discs are cheaper and have higher flow, also wouldn't the diaphgram get damaged? |
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| Novacastrian |
| Posted: 11/10/2007 16:52 PM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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| It could work with a large enough valve, however trying to time it right would be a b!tch. Also it would be very expensive, with no "real" gains. |
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| _Fnord |
| Posted: 11/10/2007 16:55 PM Post subject: |
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reenigne
Joined: 13 Feb 2007
Posts: 1257
1892.97 Spud Bux
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The diaphragm may wear out eventually. Even if his timing is off, the valve will open on it's own, so there's nothing to worry about there.
Basically it'll work, but a metal piston valve will last longer. |
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| MaxuS |
| Posted: 11/10/2007 17:02 PM Post subject: |
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Sergeant Major
Joined: 02 Sep 2007
Posts: 199
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| Indeed, if they didnt go off at the same time or even if they did, the pressure would completely destroy the sprinkler valve. |
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| _Fnord |
| Posted: 11/10/2007 17:09 PM Post subject: |
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reenigne
Joined: 13 Feb 2007
Posts: 1257
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| I don't believe the valve would be destroyed one the first shot. The first hybrid (Made by DR) used a sprinkler valve which never failed, though it was a pneumatically modded one. I don't think using an unmodded one would work the same. |
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| LikimysCrotchus5 |
| Posted: 11/10/2007 18:14 PM Post subject: |
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Brigadier General
Joined: 04 Sep 2007
Posts: 1064
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| So does the same apply to the metal piston valve, meaning that if when you ignite the mixture, the piston valve will open by itself. |
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| _Fnord |
| Posted: 11/10/2007 18:19 PM Post subject: |
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reenigne
Joined: 13 Feb 2007
Posts: 1257
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^Yes, and it's been proven.
That's how my hybrid works. |
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| LikimysCrotchus5 |
| Posted: 11/10/2007 18:46 PM Post subject: |
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Brigadier General
Joined: 04 Sep 2007
Posts: 1064
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Ahh that clears up my head now.  I wasnt sure how it would actuate because it didnt know what force would be pushing the piston back. Also do you pressurize the chamber first so that it seals, then release the mixture? Now that i come to realize some of it, if you can make a advanced combustion and a pneumatic piston cannon, then its pretty simple to make a hybrid; you just gotta know the difference in fuel injection. Thx  |
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| iknowmy3tables |
| Posted: 11/10/2007 21:24 PM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1133
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I now that the valve will open on its own with the surge of pressure even if its late.
which is likely to happen first if a parallel switch set the igniter and the valve off at the same time; the combustion or the valve opening?
if the valve is the slower one then I could put a switch on part of the solenoid so the ignition goes off when the solenoid is half way up |
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| spanerman |
| Posted: 11/11/2007 7:03 AM Post subject: |
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Lieutenant Colonel
Joined: 17 Sep 2006
Posts: 447
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| why not put a 200psi pop off valve as the ''pilot'' valve on the sprinkler? |
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| iknowmy3tables |
| Posted: 11/11/2007 8:15 AM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1133
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| its been discussed it might not really do anything but a valve opening at the same time would not have to go off only at a certain pressure change |
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| spanerman |
| Posted: 11/11/2007 8:21 AM Post subject: |
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Lieutenant Colonel
Joined: 17 Sep 2006
Posts: 447
296.08 Spud Bux
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| if i can find a suitable pop off i will be testing that with a QEV.... |
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| iknowmy3tables |
| Posted: 11/11/2007 10:34 AM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1133
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so can I varying pop off valve can be found at mcmaster
but the fact that it has to obtain a certain pressure before the valve stops restricting the flow is makes it slower |
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| spanerman |
| Posted: 11/11/2007 11:38 AM Post subject: |
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Lieutenant Colonel
Joined: 17 Sep 2006
Posts: 447
296.08 Spud Bux
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| is it signifigant though? i cant order from mcmaster...im in the UK |
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