1" PVC male thread into brass valve leaking

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  #1  
Old 09-09-09, 09:35 PM
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1" PVC male thread into brass valve leaking

I am close to finishing a project where I routed my 1" PVC water supply line into my garage for a water softener installation. Once the supply was inside the garage, I installed a brass 1" ball shut-off valve. I used 1" PVC male thread adapters to connect the pipe to the valve. I used Teflon tape on the threads before tightening them into the valve, and then cemented them to the pipes.

One of the threaded joints has a very slow leak. I searched instructions on the proper method to ensure a leak-free joint, but found nothing. Before I cut the pipe and attempt a repair, what will I need to do it right? Is it simply a matter of not having the joint tight enough? Is there some paste or dope that I need to do this right?

Thanks!

Here is a photo of the valve and leaking fitting:
 
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Old 09-10-09, 01:50 AM
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My experience with plastic thread adapters into brass valves or other fittings is that using Teflon tape almost guarantees a leak. You need to use a paste type pipe sealant. Be sure the can or tube specifically states it is approved for plastic pipe.
 
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