Small leak below main shut off valve

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fish biscuit

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Hello,
As a DIYer this forum has been such a big help over the years. This is my very first post. Just noticed we have a small leak below our main shut off valve. It appears the leak is coming from the threads of the connection to the valve. I'm guessing and hoping a 1/4 or 1/2 turn to tighten will solve the leak. I'm wondering how I do this without compromising the thread on the other side (top) of the valve. If I tighten it below won't the movement of the valve loosen the opposite thread? Do I have to disconnect the valve from the pipe above before I tighten valve? The teflon tape in the photos was my attempt to try and see if I could seal the leak from the outside. Any help or guidance would be greatly appreciated. Thanks,
 

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fish biscuit

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OK I got it apart, cleaned all the threads, put a little pipe dope on it and tightened it back up. Still has a very very tiny leak, about 1 drip every 2-3 minutes. I took it all apart again to try and look at the mating surfaces. I can see one very small imperfection on the flare. I'm guessing this may be the cause of the leak? Is there any easy option to fix this? Maybe a gasket or some kind of sealant? If it is going to require a new flare that is when I will have to let a professional take over which I am trying to avoid to save some money. Thanks,
 

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Tuttles Revenge

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depending on what the imperfection is, indentaion or crack would determine the appropriate fix. The best fix, would be to cut the pipe and reinstall a new union or flare connection assuming its required to have a removable fitting at that location.

The simplest fix might be to wrap a time or two around the cone shaped surface with teflon tape. Essentially forming a soft gasket that would fill in the imperfection. None of the tape needs to be on the threaded portion.
 
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