Manufactured using Viton synthetic rubber material which is used for more aggressive chemicals and fuels such as phosphate esters. Use to replace aging seals or insert new seals onto ORB adapters. Creates leak proof seal around adapters for most hydraulic applications. Viton O-Ring for SAE O-Ring Boss ORB Adapters.
FREE Shipping on orders over 25 shipped by Amazon.This I need to very strongly agree with: A correctly placed tapered fitting (1/8 NPT most closely mimics the form factor of the common 3/8-24 used by regulator supply hoses) is a metal to metal seal. Get it as soon as Fri, Sep 24. 6 coupon applied at checkout Save 6 with coupon.
O rings = rubber to metal seal. I would use them over a ported O-Ring fitting any day of the week for anything I can use them for. Hmm: perhaps 50 taped fittings internally. The first number listed is the size of thread, the second number is the threads per inch.An example of the use of tapered and taped fittings used in rebreathers is the ever-classic Mark-15/Mark-16 series, each of which has. JIC, SAE O-ring & Flat Face threads measure as listed below. For example, a 1/4 NPTF, BSPT or BSPP will actually measure 1/2 on the O.
In "real" (IE aerospace) use, tapered fittings are non-reusable. 110 - cylinder block & oil pan (engine) Caravan / Homy ARMGE24, One caveat. There's absolutely no question which one is more reliable.Nissan Caravan / Homy -.
It lubricates.The Swagelok fittings are bulletproof. DO NOT use more tape to try to force it to work. It's likely been distorted by a prior use and will never come back to life. Yes, we ALL reuse them, but if you have one that refuses to seal for a leak test, toss it in the trash.
These tools are expensive and you need to correctly align them with a pre-drilled and pre-tapped hole to then "port" the fitting. In homebuilt applications very few people have bought to correct porting tool to actually make the O Ring sealing surface the correct dimensions. Assuming that you tighten the fitting correctly, and replace O Rings as they degrade, mis-machining is the most common thing. The mechanical dimensioning issue itself has two possibilities: Mis-Machined dimensions, and improper installation (IE not fully seated leaving a place for the O Ring to extrude into a new spot). There are two reasons for failures in this application: Rotted O Ring, or mechanical dimensioning of the bore where the O-Ring seats. Let's talk about static, as this is what we compare to tapered threads.In a static O Ring, like a first stage regulator fitting, the sealing dimensions are held to a very close tolerance, and once the fitting is correctly tightened to set the clearances (IE no place or gap to squeeze O ring into), they will last for as long as the material of the actual O Ring lasts (IE until it rots).
The other was on the head of the rebreather at ambient pressure, resulting in a pos/neg test fail.Even though alot of rebreathers use this setup to connect hoses to the head (including the Apoc), I'm thinking of ditching this method and using nylon heads/pods with tapered 1/4NPT fittings, much like on this Apoc po2 pod I built:As you mentioned, with teflon tape as a lubricant, you get a water tight seal for ambient pressure use, and still half a turn of rotation to adjust the angle of the fittings going in.I was looking at my welding gear the other day, which uses bullnose 200bar DIN fittings. One on the BOV LP gas connection, which ended up suddenly dumping my diluent an hour into the dive. Two of these fittings failed in the last month, both due to nicked o-rings. I've had one underwater spa bath due to a mismatched o-ring on the HP port of a 1st stage (o-ring that came with an off the shelf short HP hose was too big, failed 20min into the dive).The other failures I've had have been on LP hose to 2nd stage type connections (don't know the proper name for them, but they use a 010 size o-ring).
Tapered O-Ring Seals Cracked And Now
But now, I'm at a point where with the next build I'm looking a eliminating failure points, if for no other reason than not wanting to sit out a dive due to equipment failure. At the time (6 years ago) I thought it was a pointless idea on a rebreather that was full of o-rings anyway. Basically, by using a combination of tapered threaded fittings and tapered metal to metal fittings (similar to AN fittings used in cars like the one shown below), most o-ring failure points can be engineered out.The only remaining o-rings are the dynamic ones that are needed where parts constantly move, and I can't think of any that are actually needed on my current homebuild CCR (although a fair few are being used unnecessarily at the moment).This may be o-ring paranoia, but I recall when the DIR guys used to talk about decreasing the o-ring count to eliminate failure points. Obviously a new o-ring is needed here, but why did the regulator manfacturer not stick with the low maintenance metal to metal type fitting?This got me thinking about the gas lines on my next homebuild project. After 5 years, the metal one seals just as well as it did 5 years ago, while the o-ring on the other fitting is cracked and now leaks.
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