Do CCM DPOCV Fittings Require O-rings?

[rjkobbeman]

The few that I have seen for sure have the washer/o-ring. Because they are NOT tapered threads, then they would leak unless you used a sealant which is not required. They are the equivalent of SAE/ORB fittings. They are different in that the o-ring goes inside the washer.

A couple of pictures:

International Thread Fittings: Male BSPP Plug (BSPP)

International Thread Fittings: Male BSPP To Female Pipe

Adaptor BSPP Male with O-Ring & Washer x NPT Female on World Wide Metric, Inc.

Thanks for the info. I see I have a new mission...

 

[rjkobbeman]

Well, I just got off of the phone with CCM. I spoke to a female (didn't get her name) and she seemed fairly knowledgeable on the subject. (I wonder if they have been getting this question asked a lot.)

She said that no washer/o-ring should be used. I asked about the thread standard and she replied "British Standard". Until I purchase the CMM top link I was not familiar at all with BSP and am only sort of familiar with it now (after browsing the web)... so I couldn't question her too much. She said the shoulder is different and cannot be used with a washer. I'm not sure if she was referring to the shoulder of the fitting or the recess on the DPCV that the fitting sets in.

Either way, I have no washer in my setup and it does not leak... and CCM is sticking to their "do not use a washer" story.

Clear as mud now...

 

[Rocwin]

There are two types of BSP threads, BSPP (parallel) which requires the oring seal and a BSPT (tapered) which won't require an external seal. We tend to see far more BSPP than BSPT in our industry; most Italian made machinery will use BSPP.

BSPT will look just like a standard NPT thread but has a different pitch

 

[rjkobbeman]

There are two types of BSP threads, BSPP (parallel) which requires the oring seal and a BSPT (tapered) which won't require an external seal. We tend to see far more BSPP than BSPT in our industry; most Italian made machinery will use BSPP.

BSPT will look just like a standard NPT thread but has a different pitch

Yeah, and as near as I can tell, the fittings from CCM for their HTL are BSPP. There is no taper to them. This is why I was (still am) perplexed why no washer is used.

 

[kennyd]

Yeah, and as near as I can tell, the fittings from CCM for their HTL are BSPP. There is no taper to them. This is why I was (still am) perplexed why no washer is used.

I bought my HTL from the Surplus Center with the adapter fitting-the indeed had the washer/o-ring seal.

https://www.surpluscenter.com/sort.asp?catname=&byKeyword=yes&search=9-7682

Me thinks you are just lucky:thumbsup:

 

[Brandon1107]

Well all the technical info definitely sounds correct and the pictures match, so I am amazed that 3000 psi +/- through a fitting that requires an o-ring and does not have one is not leaking. Wow that was a long sentence! I'll go stand in the perplexed corner with RJ!

Kenny I have read quite a few of your posts and you are always spot-on, so I am really questioning CCM's call on this.

Is Mark still posting here?

 

[Wayne County Hose]

Measure the threads per inch. I guarantee they are BSPP and require a bonded seal. Most Italian stuff is metric, btw. Anything with a non tapered thread, except if it has a seat such as JIC, will require some type of sealing o ring or a bonded seal.

 

[93Mustang]

I don't understand half the abbreviations in this thread but my ccm top link hose fitting to toplink leaked regardless of how tight I got the fittings until I used some pipe dope (with yet another abbreviation I can't remember but found it here on tbn). Really enjoy it now but have had to try different combinations of hose end fittings (costly...) and direction to get it to fit my 3pt space beyond the leaking.

 

[Wayne County Hose]

You guys REALLY need to figure out what fitting type you are dealing with before you hurt yourself. Get a thread pitch gauge, any decent tap and die set has one, and a digital set of calipers. Then you go to the DHH website and download their fitting ID chart. Just remember, tapered threads seal by the thread taper interfering with the port. Parallel threads need something besides the threads to seal. A seat, an o-ring, a bonded seal.

 

[kennyd]

Well all the technical info definitely sounds correct and the pictures match, so I am amazed that 3000 psi +/- through a fitting that requires an o-ring and does not have one is not leaking. Wow that was a long sentence! I'll go stand in the perplexed corner with RJ!

Kenny I have read quite a few of your posts and you are always spot-on, so I am really questioning CCM's call on this.

Is Mark still posting here?

Thanks Brandon. I have the highest regard for CCM, unfortunately they are out-to-lunch on this. The DPOCV has BSPP fittings and require a washer/o-ring to seal properly.