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Sprinkler valve

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Sprinkler valve

Unread postAuthor: airman » Fri Nov 28, 2008 12:29 pm

Can you tell me how much pressure can a sprinkler valve withstand? Per example, a Rain Bird is rated at 150 psi with water. Will it work at higher pressures, like 200 or 250 psi?

Thanks
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Unread postAuthor: SEAKING9006 » Fri Nov 28, 2008 12:31 pm

No, not safely.
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Unread postAuthor: airman » Fri Nov 28, 2008 12:41 pm

Well, it seems to me like a lot of you guys use those valves with pressures well above 150 psi from what I read or see on this forum... :wink:
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Unread postAuthor: airman » Fri Nov 28, 2008 12:45 pm

All the sprinkler valves or QEVs I find are rated at 150 psi max. How the hell do you fire your guns at 400 psi???
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Unread postAuthor: LCTChamp » Fri Nov 28, 2008 1:03 pm

You use metal pipe and a piston valve.
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 28, 2008 1:03 pm

airman wrote:How the hell do you fire your guns at 400 psi???


Like this :D :D :D
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Unread postAuthor: airman » Fri Nov 28, 2008 2:09 pm

What exactly is a piston valve? And what type do I need? Where to buy?
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Unread postAuthor: SEAKING9006 » Fri Nov 28, 2008 2:48 pm

Look here.
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Unread postAuthor: frankrede » Fri Nov 28, 2008 3:00 pm

airman wrote:All the sprinkler valves or QEVs I find are rated at 150 psi max. How the hell do you fire your guns at 400 psi???

Sprinkler valves are plastic, QEV are all metal, they have been used to over 500 psi.
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Unread postAuthor: airman » Fri Nov 28, 2008 3:14 pm

Yes, but are you talking about a 150 psi rated QEV?
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Unread postAuthor: frankrede » Fri Nov 28, 2008 3:15 pm

airman wrote:Yes, but are you talking about a 150 psi rated QEV?
YES.
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Unread postAuthor: airman » Fri Nov 28, 2008 3:23 pm

Well, that's great to know! :D

Thanks!
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Unread postAuthor: MrCrowley » Fri Nov 28, 2008 3:48 pm

airman wrote:Well, that's great to know! :D

Thanks!

Rarely do people on this forum take sprinkler valves above 125psi, let alone 150psi. I think I recall one or two. It's not safe or recommended.

With a QEV, seeing as they're metal, when at pressures over 300psi but below 800psi, the first thing that will fail is the seal or the piston. As soon as they fail, all the air will leak out and the pressure drop back down to 0.
Because it will take a lot of energy, very quickly to destroy the metal casing before the piston inside.

It's pretty much a fail safe.

But with a sprinkler, seeing as they are plastic, they can fail at far low pressures with far lower amounts of energy.
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