SpudFiles

if Im using a modded sprinkler valve with an all metal design, how to you attach the metal pipes to the plastic sprinkler valve?

You didn't get a threaded one?

i have the 1" lawn genie and it does not have threads

If the sprinkler is ment to be solvent welded to the pipe, just get a very short section of 1" pvc and a 1" threaded female adaptor and glue them on.
Then just screw the metal pipe into the adaptor and go from there.

Sprinkler valves are only rated for about 125 psi. Why all metal?

well i made a pvc cannon but i didnt use the right stuff and it blew apart. but i have tons of steel pipe fitting stuff that i can use without spending any more money. is there something you recommend using instead of the sprinkler valve?

Yeah, a QEV will do the job better.

can you point me to somewhere that explains how a qev works?

(edit: ok, the wiki also has an entry on QEVs: http://www.spudfiles.com/spud_wiki/index.php?title=QEV )

You have to buy QEVs online, as there are few stores that sell them. They work on the same principles as a piston valve (Look up piston valves on the wiki link at the top).

If you build a pvc cannon right, it won't blow apart. If you use pressure rated fittings, you'll be fine. Look for fittings that say nsf-pw on them somewhere.

If you have tons of steel pipe fittings, you might be able to make a metal piston valve. It's a bit advanced, so you should research for a while before attempting to build one.

i didnt use pressure rated fittings. thats why it blew apart.

where can i buy the proper qev valve?

Start by searching ebay for "quick exhaust valve"

Here is a lot of three QEVs for $30. (really good deal)

long link

thanks for your help man.

A QEV is basically the only valve which is easily accessable in the Uk. A 3/4" QEV will outperform a modded 1" sprinkler valve, and theres no modding required for it to work. It really depends on where in the world you live, just do a search for Quick Exhaust Valves and you should come up with some results......................You could always build a piston valve, the opening time on pistons is amazing, plus theyre cheap, need a lot of work to get it right though.