Fabricating a Custom Plug

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Postby Velocity » Sat Dec 16, 2006 12:27 am

I am considering making another big piston valve, 4" in, 3" out again. I hope to make this valve more compact and possibly more efficient/powerful than the one used on the Americannon (which was not bad; I am just seeking improvement)

<img src="http://www.spudfiles.com/uploader/uploadFiles/customplug32.JPG">

The socket depth on a 4" fitting is 2" (I believe). Therefore, I will cut a length of 4" SCH 40 pipe 2" long. Inside of this pipe, I will solvent weld a piece of 4" OD PVC rod. My first question is, how long should that disk of 4" OD PVC rod be?

Once this whole assembly is done, a few o-rings will be added, and it will be placed inside one of the sockets of a 4" tee. Then it will be secured by screws (maybe 20-30). Does anyone know of certain screw length/size/type that would work well for this application?

Thanks for your answers; more questions in the future (probably)
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Postby sgort87 » Sat Dec 16, 2006 1:10 am

4" rod is awefully expensive. A foot of it from McMaster is $43.34 before shipping.

The best thing for you to do is buy a 4x2" Slip x Thread bushing and then reduce more from there if needed.This is not only less expensive, but more reliable and nicer looking.

If you insist on a flat back cap, I could always get you a 4" plug. They cost $15 locally.

Another way to do this is with a 3" cap in 4" pipe. I'd suggest one of the other two though.
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Postby markfh11q » Sat Dec 16, 2006 10:36 pm

Well, if you do make this I suggest making the disk as long as possible, (i.e. - two inches). This lets the cement have more surface area to bond. You could also go hunt down a 4" spigot plug at a plumbing store somewhere, (none on McMaster).
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Postby sgort87 » Sun Dec 17, 2006 2:51 am

Oh, and I forgot to mention, the depth of a 4" tee's socket is more like 3-3.5". You have a bit more play than you had originally planned for.
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Postby Velocity » Sun Dec 17, 2006 2:17 pm

The 4" plug sounds like a fine idea; it was kinda my backup idea (and now I probably will use it, because I do not want to spend a lot of money on a foot of 4" PVC rod

sgort: are you sure that the depth of a 4" tee is like 3"-3.5"? I have noticed that my 4" spigot fittings are the same length as my 3" spigot fittings. It also appears as though the coupling sockets are equal on both 3" and 4" fittings. I own a 4" tee (already solvent welded up, so I can't measure), and it also appears to have a depth of about 2"
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Postby sgort87 » Sun Dec 17, 2006 2:32 pm

Hmm, well I suppose it could be 2". I can check into it., but generally if you measure <a href="http://www.spudfiles.com/uploader/uploadFiles/measurethis.JPG">this distance</a> minus maybe a quarter inch at most, that should be your socket depth. The reason I really think it's deeper is they tend to go up as size goes up and I know that 2.5" sockets are exactly 2", but that could also mean, as you said, that they just remain at 2"

Did you need me to get you that plug? If you need, I can also lathe off the hex , cut it to size, and put a groove in and stuff if you want.
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Postby Velocity » Fri Dec 22, 2006 10:56 pm

Sorry for the late reply

sgort: Thanks for the offer regarding the plug. I may be getting a lathe for Christmas, and therefore I would not need to take you up on your generosity. But I will keep your offer in mind, just in case. I will email you if I find out that I would need that plug. Thanks again
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Postby SpudMonster » Sat Dec 23, 2006 12:06 am

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by sgort87
[br]Hmm, well I suppose it could be 2". I can check into it., but generally if you measure <a href="http://www.spudfiles.com/uploader/uploadFiles/measurethis.JPG">this distance</a> minus maybe a quarter inch at most, that should be your socket depth. The reason I really think it's deeper is they tend to go up as size goes up and I know that 2.5" sockets are exactly 2", but that could also mean, as you said, that they just remain at 2"

Did you need me to get you that plug? If you need, I can also lathe off the hex , cut it to size, and put a groove in and stuff if you want.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">


They sure do not stay at 2" for the socket depth. A 6" pipe socket varies between 3.5" and 4"
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