DIN O-Ring Problems

[chrpai]

I've got a Hog BP2 reg that I use on my AL40. It came with an odd DIN o-ring that was somewhat mushroom shaped. I had some problems getting a good seal so I replaced it with an o-ring from the local dive shop that was from the shop bench.

This o-ring failed so I bought a trident save a dive kit ( 20 o-rings ) and installed one from it today. I charged the reg and turned off the valve. Several hours later while watching a movie I heard a hiss. The o-ring had failed.

In examining the o-ring it split down the middle where there is a seam.

Can anyone give me an idea of why I'm having such problems with freaking o-rings on this reg? Am I just getting crappy o-rings from the LDS?

 

[gcarter]

Aren't there two slightly different sizes for DIN regs? Are you using the wrong one?

 

[pickens_46929]

Check to see if there are any burrs or sharp edges left that weren't smoothed out after the initial manufacturing or that happened during assembly. It's been known to happen.

 

[UncleJaybles]

I don't know anything about the specific regulator you use, but maybe it is one of the few DIN regs that takes a 111 o-ring as opposed to the much more common 112.
As for the mushroom shape, I don't think I've ever seen an o-ring that wasn't circular in cross section. The mushroom shape (I would assume) is just from it being deformed after a period of high pressure service...

 

[jwelburn]

HOG and Apeks use the smaller ring. The DIN rings do tend to deform over time so they look in cross section to be lopsidedly mushroom shaped. The larger O- ring will fit, but because it's got a bigger space to squeeze through it will fail more often. I would also check the valve for buildup or damage.

Sent from my C771 using Tapatalk 2

 

[elan]

Im not sure about HOG but Apeks uses their own - metric size o-ring Neither 111 nor 112 will fit properly. 111 kind of fits but you can see it is not a proper size. Last time I saw the diagram of BP2 it looked from the part numbers that the o-rings were imperial but cerich did not answer my question whether the orings are imperial and just suggested to buy a kit.
I suppose if you get a rebuild kit it would have the proper oring

 

[cerich]

It takes a 90 durometer 112 O'ring. You are most likely using a 70 durometer which is too soft. 90's are harder to find.

We will make them available to purchase shortly thru our dealers in packages of 6 orings. The 90 really is a PITA to find.

---------- Post added August 19th, 2013 at 04:00 PM ----------

or buy them cheaper from other sources like

http://www.zorotools.com/g/00075374/k-G0781907?utm_source=google_shopping&utm_medium=cpc&utm_campaign=Google_Shopping_Feed&kw={keyword}&gclid=CKTq3ImzirkCFQya4AodSH8AEg

PKG-HF-112V90 | 90 Durometer Viton O Ring

 

[redacted]

Reasonably priced sources:

112 V90 Black Viton O-ring [V90112] : The O-ring Store - O-rings, Seals, Kits, in Metric and Standard Sizes, We make placing your O-ring order and getting your O-rings Online easy!

112 U90 Urethane O-ring [U90112] : The O-ring Store - O-rings, Seals, Kits, in Metric and Standard Sizes, We make placing your O-ring order and getting your O-rings Online easy!

oringsUSA

And others if you go looking.

 

[cerich]

both sources I posted are less expensive...but you need to buy more than a single..

Reasonably priced sources:

112 V90 Black Viton O-ring [V90112] : The O-ring Store - O-rings, Seals, Kits, in Metric and Standard Sizes, We make placing your O-ring order and getting your O-rings Online easy!

112 U90 Urethane O-ring [U90112] : The O-ring Store - O-rings, Seals, Kits, in Metric and Standard Sizes, We make placing your O-ring order and getting your O-rings Online easy!

oringsUSA

And others if you go looking.