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Valve Opening Time-

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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Valve Opening Time-

Unread postAuthor: BrianMigs » Mon Jan 28, 2008 9:57 pm

Does anyone know where I can find a list of how long it takes a certain type of valve to open?

i.e., ball valve, spring ball valve, piston, sprinkler valve, modded sprinkler valve?

And I have a sprinkler valve that I am going to modify with a blowgun, but if I add a foot or two of hose in between the valve or the blowgun, how much will it decrease performance? it will still be better than electrically operating it correct?

thank you! :D
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Unread postAuthor: MrCrowley » Mon Jan 28, 2008 10:14 pm

Read <A HREF="http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=1793&postdays=0&postorder=asc&start=40">this</a> thread, the page it currently is on has times for sprinkler valves so you may have to skip through the pages for the ball valve. But it does have the times for modded and un modded sprinkler valves.

The hose will decrease performance, not sure exactly how much, but that's something you can find out on GGDT.
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Unread postAuthor: BrianMigs » Mon Jan 28, 2008 10:20 pm

Thank You a lot for that thread. I am filling in all the bits and pieces to GGDT for my own gun.

How can I figure out the decrease in performance?

I am kind of new to all this, I really appreciate the help mate.
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Unread postAuthor: MrCrowley » Mon Jan 28, 2008 10:24 pm

It will ask you in GGDT for the pilot volume of the valve you are using. Either measure the I.D of the hose and find out the volume using math or just fill it with water and convert the volume in liquid to a volume in cubic inchs or cm.
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Unread postAuthor: BrianMigs » Mon Jan 28, 2008 10:29 pm

So just compare differences using the different numbers of pilot volume?

I thought having a higher pilot volume was good, which is why I am modding my sprinkler in the first place?

Spud guns, if you think about, really confusing sometimes. :help: :help:
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 28, 2008 11:49 pm

BrianMigs wrote:I thought having a higher pilot volume was good, which is why I am modding my sprinkler in the first place?


HERESY!

*ahem*

The larger the pilot volume, the longer it takes to empty and therefore the valve opens slower -----> less power

The point of modding the springkler is to replace the solenoid (tiny tiny flow) with a blowgun (much better flow) in such a manner that the pilot will empty quicker ;)
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Unread postAuthor: bluerussetboy » Mon Jan 28, 2008 11:52 pm

BrianMigs wrote:
I thought having a higher pilot volume was good, which is why I am modding my sprinkler in the first place?



No, your modding your sprinkler valve so it gets rid of the pilot volume quicker.



i hate when the bouncer lets the pretty girls into the club before me. they always get to use the new dance moves first.
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Unread postAuthor: BrianMigs » Tue Jan 29, 2008 4:11 pm

Aye, but I dont think like 1 1/2 feet of 1/4 inch ID tubing will kill me will it?
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 29, 2008 11:19 pm

It will still work but cut your performance down by a certain percentage, if you're willing to live with that go ahead.
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Unread postAuthor: BrianMigs » Tue Jan 29, 2008 11:34 pm

You are killing me Jack, LOL

As long as its still a lot better than electronically actuating it, I will be happy
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 29, 2008 11:44 pm

You just happened to step on the toes on my efficiency crusade :D

As long as its still a lot better than electronically actuating it, I will be happy


Fine, if you're willing to settle for such low standards, there's nothing we can do to help you *hmph*

Just kidding, don't let the Nazis spoil your fun ;)
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Unread postAuthor: rna_duelers » Wed Jan 30, 2008 12:16 am

Listen to jack,Small pilot volume is very important for performance.I made a modded sprinkler valve before and had about 30cm of 1/4 ID tubing between it and the blow gun and the performance between having the blow gun right on the valve and with the hose was noticeable,VERY noticeable.
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Unread postAuthor: POLAND_SPUD » Wed Jan 30, 2008 2:01 am

what is better as a pilot valve a 3/8" slide valve or a 1/2" ballvalve ?
you know in terms of vent diam?
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Unread postAuthor: rna_duelers » Wed Jan 30, 2008 2:04 am

What sized valve is this going to be used on?If it's a 1" sprinkler then don't worry about going above 1/4 at all,but for a large piston the larger the better to an extent,so the 1/2 ball valve.
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Unread postAuthor: mark.f » Wed Jan 30, 2008 6:57 am

A 1/4" ball valve should be better than a 3/8" slide valve, but the 3/8" slide valve should have sufficient flow to get the job done, and be more ergonomic to use. If at all possible, mount it directly to the sprinkler valve, and don't use a hose. My first sprinkler used a hose, and managed to honk excessively when fired. My newer sprinkler valve has a blowgun tapped directly into the valve cover, and fires nicely every time.
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