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| Jolly Roger |
 Posted: 09/01/2006 7:50 AM Post subject: High Pressure dump valves for piston operation |
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Master Sergeant
Joined: 25 Aug 2006
Posts: 156
179.97 Spud Bux
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| I've got a question regarding valves. I was looking at snipermans kick ass rifle and found that it's relatively similar to my design I'm still experimenting with. My setup is pretty much the same but I need a valve that can handle a relatively high pressure (300-440psi working pressure, and no it isn't made from pvc...) The trouble is finding one though. I've thought about just attaching a blowgun of some sort. That ghetto dude hooked his up to a hpa tank which is @#*%in crazy but if it hasn't killed him yet I'm pretty sure it would be able to handle between 300 and 400psi...? Dunno. Heres some links to some of the valves I found. 1. http://www.bhdustcollectors.com/diaphragmvalvesbase.htm These are jet valves - used in dust collectors... ?I think they are exactly the same as a sprinkler valve by the looks and characteristics but I can't tell. The tech specs are so confusing... PCguy uses the same brand of valve on his launcher but I don't know if they work the same. 2. http://www.pvl.co.uk/valves.htm The second is a pilot operated piston valve (down the page) that can go up to 15bar. That'd be perfect except I was wondering if I could take the solenoid off and connect a pneumatic trigger just like a normal sprinkler valve. Wires and batteries are a pain in the ass. Anyone have any suggestions?
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| Velocity |
| Posted: 09/01/2006 9:01 AM Post subject: |
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Brigadier General
Joined: 07 Feb 2006
Posts: 1011
83.82 Spud Bux
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| I used the 1.5" Goyen valves on one of my launchers, and it is only intended to pressures up to 125 PSI; However (unlike a sprinkler valve), this valve is made of aluminum, so when something breaks, it will definitely be the diaphragm.
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| Brian the brain |
| Posted: 09/01/2006 9:59 AM Post subject: |
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Dutch Spud Clan Leader
Joined: 05 Dec 2005
Posts: 1339
2233.28 Spud Bux
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I say build your own out of galvanised fittings and a ballvalve as a pilot.
Performance is great, and it can handle high pressures.
Make the piston out of a bolt, metal washers and nuts.Then some neoprene for the sealing surface.
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| Jolly Roger |
| Posted: 09/01/2006 20:54 PM Post subject: |
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Master Sergeant
Joined: 25 Aug 2006
Posts: 156
179.97 Spud Bux
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Yeah I was gooing for the realistic firing look, thought about ballvalves but their not really compatible with a rifle style gun. Fire extinguisher valves seem okay. They say that they can handle working pressures of over 290psi which would obviously have a very high burst pressure. I think I might build my own fittings and such as brian suggested. Yeah, now I come to it, I might just use that, KISS, unless of course anyone has any creative suggestions. Always open to ideas.
EDIT: I've dramatically changed my desgin and need a rethink on my valves. I've just stumbled accross some paintball 3 way push button valves... https://palmer-pursuit.com/ecom/product_info.php/cPath/30_39/products_ id/462?osCsid=4bcf3a0161d948a334b50ce798fc3a91 They are high pressure but I need them to work a certain way. I need the valve to instantly swith the air flow from (a to b) to (b to c)... If you follow. Going from a into b and then on the push of a button from b into c. I've attached a diagram to explain. Can anyone tell me if Im able to do this with these valves? I'm really stuck... (oh and by the way point b is the exhaust end of a piston cannon if that may aid in analysis.)
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| dinsdale |
| Posted: 09/02/2006 14:32 PM Post subject: |
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Sergeant
Joined: 27 Aug 2006
Posts: 91
166.66 Spud Bux
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| for your piston you could still use pvc rod, it would be lighter that steel, therefore faster, a solid pvc piston inside the pressurized metal tube will hold up
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