Thread: Fitting Wilwood RPV to 3/8" flared line

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Plumbing gets complicated---NPT, AN, inverted flare, double flare,37*, 45*, compression, etc

One of the best tips I give people is to use coat hangers to mock up for lines before bending them

Originally Posted by jerry clayton

Plumbing gets complicated---NPT, AN, inverted flare, double flare,37*, 45*, compression, etc

One of the best tips I give people is to use coat hangers to mock up for lines before bending them

Coat hangers work well, but with the price of the standard 3/16" so low that I just make up the entire system without flares. I think for my '31 the cost of the dummy system added $20-$25 to a multi thousand dollar car.

And the mish-mash of fittings on a street rod - that could make a saint swear

My Wilwood Residual Pressure Valves didn't have any fittings in them when I bought them, since I am using AN fittings I bought an 1/8 NPT to -3 AN adapter. Put some thread sealer on the NPT side and screwed in into the RPV. I also purchased everything from Inline Tube like Dave did.

Keith

Well if the only way to use these wilwood rpv's with AN fittings is to use sealer then that's good enough for me with my inverted flares. I'm tired of spending so if I can avoid $50 bucks on more residual pressure valves I will. Now the question is exactly what kind of sealer we are talking about here. Just any tube of "thread sealant"? any certain temperature rating or purpose exactly?

Originally Posted by 35fordcoupe

Well if the only way to use these wilwood rpv's with AN fittings is to use sealer then that's good enough for me with my inverted flares. I'm tired of spending so if I can avoid $50 bucks on more residual pressure valves I will. Now the question is exactly what kind of sealer we are talking about here. Just any tube of "thread sealant"? any certain temperature rating or purpose exactly?

You need adapter fittings - the Wilwood RPV's are NPT, not AN. While you can probably get the AN's started, they will never seal permanently and sealant is not the best way. It's a last resort on like fittings.

http://www.anplumbing.com/shop/index...op=&dept=Steel

Lots of bits and pieces shown here - and an easy site to navigate. A few bucks more on the right brake line fittings can save lives - and not a place I would scrimp.

I hear what you are saying Dave and I will not be sacrafising safety to save a few bucks, but I think you might be misunderstanding what I have exactly. I have 3/16 standard double flared lines with the adapter below into the npt wilwood rpv. Right now it leaks, but with a little sealant, which as I understand it is accepable, it should be fine. Does that sound ok?

http://www.speedwaymotors.com/Straig...ters,6463.html

You are confusing the fittings here i'm afraid, The Willwood valves are 1/8" NPT, you need either a 1/8" NPT to -3AN adaptor which uses a female tube nut and sleeve or you use a 1/8" NPT to 3/8" UNF Female adaptor which uses a 3/8" UNF Male tube nut, No sealer is needed although the 1/8" NPT to 3/8" UNF Female adaptor usually come with red sealer already on them.


1/8" NPT to -3AN adaptor



Use this tube nut & sleeve




1/8" NPT to 3/8" UNF Female adaptor



Use this 3/8" UNF male tube nut

Yes but only put the sealer on the thread a few threads in, that way you won't get sealer in the brake system. Do not put sealer on the first few threads.

Originally Posted by 35fordcoupe

I hear what you are saying Dave and I will not be sacrafising safety to save a few bucks, but I think you might be misunderstanding what I have exactly. I have 3/16 standard double flared lines with the adapter below into the npt wilwood rpv. Right now it leaks, but with a little sealant, which as I understand it is accepable, it should be fine. Does that sound ok?

http://www.speedwaymotors.com/Straig...ters,6463.html

Steve - you took the words right off of my fingertips (both fingers). Thanks!!

You say it leaks, is the pipe thread leaking or the inverted flare connection?I want to get this straight.

You have Wilwood Residual Pressure Valves. The RPV's should have female 1/8" pipe thread. You will need adapters to tread into the RPV ends, they will have to be male 1/8" pipe to 3/16" @ 45 degrees inverted flare, since you are using 3/16 double flare, which I see you have. I have used teflon tape on my pipe threads with absolutely no problem and I know many other rodders that have done the same. There are several types of liquid (paste) types on the market, APR, makes one (my preference), can also get pipe thread sealant at your local hardware store or big box stores too. You do not want to put any sealer of any kind on the flare end fitting, they should seal by the connection alone. Hope I cleared up any confusion we may have caused.

Keith

I hope he gets it.

Keith

I do believe that I get it. The pipe thread is leaking, 31 and what you say is exaclty what I have minus the sealer.

Steve- I have the "3/8" UNF male tube nut" into the "1/8" NPT to 3/8" UNF Female adaptor" into the residual pressure valve which is 1/8" NPT and I will put a little sealer a few threads in, but you say sealer is not necessary? All four of my adapter to rpv connections leak. I think I got it a couple posts ago because it seems to be exactly what I have, but I appreciate everyone taking me through this.

Originally Posted by 35fordcoupe

I do believe that I get it. The pipe thread is leaking, 31 and what you say is exaclty what I have minus the sealer.

Steve- I have the "3/8" UNF male tube nut" into the "1/8" NPT to 3/8" UNF Female adaptor" into the residual pressure valve which is 1/8" NPT and I will put a little sealer a few threads in, but you say sealer is not necessary? All four of my adapter to rpv connections leak. I think I got it a couple posts ago because it seems to be exactly what I have, but I appreciate everyone taking me through this.

Oh well - just make sure you give us an update with the 'fix'. These 'nigglers' are fun to talk through and most of us really like to spend other folks money as well.

well I guess I don't get it then or I am not explaining what I have well enough, but from what I can tell what I have is Steve's second option. Dave- I think you have me wrong here. I came here for help and appreciate what I am getting, but if I am not understanding quick enough I appologize..

You have it right in these pics, next double flare the pipe and usea male 3/8" UNF tube nut and your there.

While we are talking flares in my opinion all brake lines should be double flared including stainless line, I believe its actually illegal here in the UK to single flare a brake line.
Single flares have a habit of cracking behind the flare where the double flares are much stronger due to the twin wall effect from double flaring.

Originally Posted by 35fordcoupe

well I guess I don't get it then or I am not explaining what I have well enough, but from what I can tell what I have is Steve's second option. Dave- I think you have me wrong here. I came here for help and appreciate what I am getting, but if I am not understanding quick enough I appologize..