What is the best way to stop a leak from a newly replaced water compression value with a new ferrule, etc? I have a small leak coming from the back of the bolt that screws into the valve. Is it possible that the end of the copper pipe was not flushed against the valve to get a tight fit even if teflon tape as used?

Thanks,
Infodoc

Tighten 'er up!

If that don't work, then it's possible you may need to take the assembly apart and put a new ferrule on, it's possible there could be a burr, or a minor inperfection with the pipe causing this issue. Also check the water valve connection (what the nut screws on to) make sure there is no burrs or debries that would cause an inpefect seal.

If it's the pipe, just cut off the bad section and try again.

If you are using any teflon tape or dope to make a seal, clean that stuff off there, compression fittings need no teflon. It's just a metal on metal seal.

No teflon tape with compression fittings.

You can pull the old ferrule off and use a new one with a special puller.

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Originally Posted by KeepItSimpleStupid

No teflon tape with compression fittings.

You can pull the old ferrule off and use a new one with a special puller.

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I'd like to know more about this puller, I've run into a lot of situations with stubborn ferrules, especially those that have been on for years, for some reason gas fittings are the worst. In fact, the boss and I were fighting one today, finally just had to cut it off...

See the picture below for the puller, Thanks.

John

Gas fittings should probably be flared.

Quote:

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Originally Posted by andrewc24301

I'd like to know more about this puller, I've run into a lot of situations with stubborn ferrules, especially those that have been on for years, for some reason gas fittings are the worst. In fact, the boss and I were fighting one today, finally just had to cut it off...

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Compression fittings should NEVER be used on gas lines.

Quote:

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Originally Posted by Infodoc

What is the best way to stop a leak from a newly replaced water compression value with a new ferrule, etc? I have a small leak coming from the back of the bolt that screws into the valve. Is it possible that the end of the copper pipe was not flushed against the valve to get a tight fit even if teflon tape as used?

Thanks,
Infodoc

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1)You don't use Teflon Tape on a ferule. (See ferule puller image) TRemove the tape from the ferule and crank down on the compression nut ,(see image).
2) You NEVER use a compression fitting on a gas line. Flared fittings only.
Good luck, Tom

Only place I've seen compression fitting on gas is a pilot light in a gas stove on about a 1/8" Aluminum tube.

Quote:

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Originally Posted by speedball1

1)
2) You NEVER use a compression fitting on a gas line. Flared fittings only.
Good luck, Tom

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I myself have never seen them on a main "gas line". I'm speaking of the gas lines within an appliance. In which case I've seen a lot. Mostly in older commercial ovens and ranges. Still very common in standing pilots. I recal having this struggle getting a ferrule off a gas line while trying to change a gas valve on an old oven.

Regarding outside the appliance, no I've never seen a compression fitting used. Normally black iron pipe.

Wait wait wait, now that I think about it, the compression fitting was on the gas line leading to the main burner assembly next to the burner. In that case, it wouldn't be pressurized anyway.

But, almost every standing pilot assembly I've seen uses compression.