inline sprinkler valve leaks at threads..how to fix it

I have a 1 inch valve inline for my sprinkler system. No matter how many twists of teflon tape I do, it keeps slowly leaking water. I tried 8, 10, 12 even.. still no luck. The water pressure is about 80psi. It leaks on the supply side. what do I do ?
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Rein wrote:

I spent two years helping hubby rehab an old, neglected irrigation system for our condo. Hubby does power tools, lifting really, really heavy stuff, like carrying furnaces up four flights of stairs. I do the clean-up, hold stuff for him, and ask dumb questions. One thing I had to continually browbeat him about was washing soil off a joint before he opened a pipe or took off a sprinkler head, so's the dirt didn't get in the line. It will grind up your fittings and is nasty for the sprinkler heads. Your fitting may be trashed, or the teflon tape too thin?
This page discusses teflon tape: http://www.irrigationtutorials.com /
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Without more information, my guess is that you probably have a hairline crack in the threaded area of either the pipe or the valve. All the Teflon tape in the world won't help in this situation. Assuming that a crack is the problem, don't waste your time trying to repair the crack. The only reliable fix is to replace the threaded section of pipe and/or replace the valve. Pipe & threaded fittings are dirt cheap and a new valve will set you back about $20.00 or so.
HTH
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On Wed, 07 Apr 2004 10:58:21 GMT, "Banister Stairwell"

thanks HTH, That was my next step.. it's at the end of a set of 2 valves so I can easily replace the threaded piece of the pipe. I inspected the valve closely, it's a new valve and looks okay to me. I was just wondering if there better ways to seal this stuff than teflon tape.
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