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2" Piston valve 1.5" porting

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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2" Piston valve 1.5" porting

Unread postAuthor: Gun Freak » Tue May 04, 2010 4:04 pm

Here is my valve I made yesterday, its for my golf ball gun. Whole thing will hopefully be done by tomorrow and I'll post it this weekend. Or maybe sooner. But anyway, the piston is Hubb's 2" piston design (1 1/4" coupling), the bumper is some car washing sponge foam with a few squishy rubber disks (6 of them about 1/8" thick), which I am not sure if it will hold up. What do you think? The pilot is a 1" modded sprinkler pilot by a severly modded blowgun, and the front connection is a 1.5" female adapter. The seat is 1.5"

Whole:
Image

Pilot:
Image

Piston:
Image

Closed:
Image

Open:
Image

From front:
Image

Bumper, I'm scared it isn't enough...
Image

To be used on this gun:
Image
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Last edited by Gun Freak on Tue May 04, 2010 4:27 pm, edited 2 times in total.
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 4:06 pm

Looks great but isnt the porting 1.5 inch because thats what the seat is? Cant wait to see the gun
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Unread postAuthor: Gun Freak » Tue May 04, 2010 4:07 pm

The seat is what the piston seals against right?
The tee has a bottom port of 2" so it is a 2" porting.
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 4:10 pm

You sure, I think the porting refers to the size the seat pipe is.
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Unread postAuthor: Gun Freak » Tue May 04, 2010 4:13 pm

Hmm I don't think so. Maybe you're right. We'll wait for somebody else to reply. I'm pretty sure the seat is the diameter of the pipe it seals against and the porting is the bottom.
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Unread postAuthor: jor2daje » Tue May 04, 2010 4:18 pm

Porting is where the air leaves from so in your case it is 1.5" porting
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 4:19 pm

Ok, but I think what i said is true, read MrCrowleys state below the video
http://www.instructables.com/id/Golf-Ba ... -Shoot-40/
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Unread postAuthor: MrCrowley » Tue May 04, 2010 4:23 pm

Yup, the porting refers to the seat size. Even if your seat was 1.8", seeing as you have a 1.5" adapter the porting would only be 1.5" as that is the restricted flow diameter.

All sizes are nominal as well, even though 1.5" pipe doesn't have an I.D or O.D of 1.5", you'd still say the porting is 1.5".
Nice piston valve though, does it work?
Your chamber is volume is massive haha, but if you have a big compressor it doesn't really matter.
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Unread postAuthor: Gun Freak » Tue May 04, 2010 4:27 pm

Yeah I have a big compressor. The chamber is freaking badass though.

Well then I'll edit the title. I thought the porting was the bottom port of the tee.
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 4:31 pm

Imagine trying to take that up to 100 psi with a bike pump, what about covering the bumper with duct tape and add some rubber tubing
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Unread postAuthor: Gun Freak » Tue May 04, 2010 4:33 pm

It would take about 10 minutes for me to get it that high with a bike pump :P lol

I'll try reinforcing the bumper with some duct tape.
theres some rubber hose in the neighbors trash so i'll get some :D
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 4:35 pm

lucky, i pay 1.50 a foot at lowes for latex rubber tubing(I use it for paint grenades)
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Unread postAuthor: Gun Freak » Tue May 04, 2010 4:36 pm

it's just some garden hose but i'll stick it long ways up my bumper to make the hole in the middle bigger and to reinforce it
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 4:37 pm

Gun Freak wrote:it's just some garden hose but i'll stick it long ways up my bumper to make the hole in the middle bigger and to reinforce it

You could use a pool noodle, I heard one person say it got sucked into the valve but Id think you would have the same problem with the foam your using now
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Unread postAuthor: Gun Freak » Tue May 04, 2010 4:43 pm

Yeah I'm gonna ask reed if he has one to use cuz i dont trust my current bumper
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