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Butterfly Valves

Unread postPosted: Sun Mar 19, 2006 9:57 pm
Author: Atlantis
I have 2 questions.
1: How effective are butterfly valves?
2: Would it be possible to build one myself?

I know butterfly valves are used in pumpkin chuckers, but would it be good in a smaller version? I'm going to try and make one out of PVC or something. I don't really like the concept of pneumaticly fired piston valves, I prefer to keep things mechanical.

Unread postPosted: Sun Mar 19, 2006 11:19 pm
Author: rna_duelers
With a butterfly valve the performance will depend on how quickly u can open the valve,trying to make one yourself might be hard.You could also save up a bit of cash(or alot) and buy one.On mythbusters they made a chicken cannon using a butterfly valve and it worked ok,but it was massive like a pumpkin chucker.

Unread postPosted: Mon Mar 20, 2006 7:50 pm
Author: Atlantis
I posted this right after I saw that episode. If I used a spring loaded valve or a pneumatic ram, I could open it with decent speed.

Unread postPosted: Mon Mar 20, 2006 9:32 pm
Author: dragon finder
Sorry but what is a butterfly valve :?: :?:

Unread postPosted: Mon Mar 20, 2006 10:36 pm
Author: Shrimphead
Took less than one minute to find it with a quick search on mcmaster.

They are similar to ball valves, they just open with a turn of the handle.

Unread postPosted: Tue Mar 21, 2006 12:36 am
Author: rna_duelers
You can buy electronic activated butterfly valves,but they are very expensive...used in mines and petroleum refineing.well give it a go and see,thats the true way to tell.

Unread postPosted: Tue Mar 21, 2006 12:50 am
Author: Rambo
I see no practical difference between this and ball valve.

Unread postPosted: Tue Mar 21, 2006 4:58 pm
Author: boilingleadbath
Indeed, Rambo, they are just about the same. The difference being that 4" or even 6" butterfly valves are affordable (and common on E-bay) whereas 4" ball valves are not.

The electrically operated valves take multiple seconds to open - they are primarily for industrial systems, so you don't have to have a worker run around opening and closing valves.

Butterfly valves are covered in the spudwiki. I'm getting damn annoyed with these people who (should) know about it, but chose not to use it.

Unread postPosted: Sun Jun 18, 2006 6:41 pm
Author: WOW!!
I think the difference is in the strenght. Think, witch is stronger, a flat plate or a a plate that has been rounded over?

Unread postPosted: Sun Jun 18, 2006 10:34 pm
Author: Atlantis
There are also things called Globe Valves. They're basically reinforced ball valves.

Unread postPosted: Sun Jun 18, 2006 10:52 pm
Author: CS
<a href="http://cgi.ebay.com/6-CAST-IRON-BUTTERFLY-VALVE-SS-DISK-TEFLON-SEAT-NEW_W0QQitemZ7630854850QQihZ017QQcategoryZ53303QQssPageNameZWDVWQQrdZ1QQcmdZViewItem">What about this?</a>