Supah Valve Modification

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Postby ShowNoMercy » Mon Mar 12, 2007 2:33 pm

If I wanted to use a bigger valve or QEV to actuate a supah valve could I just drill out the hole there already and re tap it?
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Postby markfh11q » Mon Mar 12, 2007 2:35 pm

What size Q.E.V. are you planning to use? I wouldn't go over the size already there for fear of messing up an internal component hidden from sight...
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Postby ShowNoMercy » Mon Mar 12, 2007 2:37 pm

Well as of now its a 1/4" input, but I think its just a PVC bulkhead and if the new threads didn't protrude any further than the origanals it shouldn't be a problem right?
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Postby sgort87 » Mon Mar 12, 2007 7:50 pm

There's nothing hidden in that valve. It's fairly simple and pretty empty really. You are totally fine in drilling that hole out and tapping it, but be sure to get the PVC shavings out.
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Postby ShowNoMercy » Mon Mar 12, 2007 8:15 pm

Sweet, so then a bigger valve to actuate it should bring back some good results?
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Postby BewareOfDog » Mon Mar 12, 2007 11:23 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by ShowNoMercy
[br]Sweet, so then a bigger valve to actuate it should bring back some good results?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Not necessarily...A member once told me that, in order for your piston valve to work properly, the pilot must be the correct size/volume. Experimental alteration of the "Supah" may result in a decrease in performance.

The 3" Irrigation valves I use actuate much better with only a 1/4"NPT blowgun, than they do with a 3/8" pilot, leading to a 1" modified sprinkler valve...

Bigger is not always better / If it ain't broke ...
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Postby sgort87 » Tue Mar 13, 2007 12:34 am

I have noticed that main valves do not like to be piloted by diaphragm valves. This causes the main valve to reseal itself before it is actually finished dumping because of the spring-like behavior of diaphragms. Sprinkler valves piloting a Supah generally work because of their large pilot volume, but using a large ball valve or a piston-type QEV works better because they do not reseal themselves.

If you are going to modify this Supah to use a QEV as a pilot, be sure to use a piston-style QEV and not a diaphragm-style.
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Postby Gramanam011 » Tue Mar 13, 2007 12:55 pm

I have seen two Supahs modified with QEV's.
I think it was some topic about buying/ modifiying a Supah. Some person was complaining about how someone damaged their supah and they had a picture.


The topic was here: http://localhost/forums/viewtopic.php?t=15832
The poster was Rmich732

I would talk to him. Hope that helps!
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Postby ShowNoMercy » Tue Mar 13, 2007 7:44 pm

thanks for your help, i think i am going to leave it as is for now. But in a sorta random tangent, what is the biggest T fitting you can get in PVC?
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Postby sgort87 » Tue Mar 13, 2007 9:41 pm

You can get a tee in any size that they make pipe for. (PVC is sometimes made in sizes exceeding 2 feet in diameter.) It's just gonna cost you a lot and/or you will have to do a lot of looking around.
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