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Piston valve trouble

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Piston valve trouble

Unread postAuthor: Mini Khan » Mon Feb 27, 2006 12:20 am

My piston valve makes a seal but it doesn't activate when I open the 1/4" ball valve at the end of my 4" diameter x 9 foot long cannon. I think the problem is the primary chamber before the piston is the only chamber filling up... but why won't it work? :cry:

*edited for caps locks by boilingleadbath
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Unread postAuthor: TfAv1228 » Mon Feb 27, 2006 12:25 am

Rules wrote:General posting guidelines:
When creating any new topic or post, please refrain from the use of ALL CAPS. It's annoying.
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Unread postAuthor: Mini Khan » Mon Feb 27, 2006 12:30 am

ok
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Unread postAuthor: Shrimphead » Mon Feb 27, 2006 12:55 am

I think that it could be that the chamber isn't filling (like you said), but it really just sounds like you need a real pilot valve. A 1/4" ball valve isn't going to vent a 4" chamber fast at all. What you really need is something like a 2" modded sprinkler valve. Even a 1" would work, just not as well.
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Unread postAuthor: boilingleadbath » Mon Feb 27, 2006 4:32 pm

It's not possible to only fill the chamber region of a piston valve (barrel or chamber sealing) - the valve would open.

Instead, the pilot valve isn't venting fast enough - the pressure behind the piston doesn't get low enough to "pull" the piston off the barrel. This could be redemied by getting a better-sealing (on the walls of the chamber) piston, or using a larger pilot valve.
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Re: Piston valve trouble

Unread postAuthor: Shrimphead » Mon Feb 27, 2006 5:22 pm

Mini Khan wrote: I think the problem is the primary chamber before the piston is the only chamber filling up


I think that he's saying that only the pilot is filling.
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