Coltri pressure maintainig valve, where to get a service kit?

[Agro]

Coltri Pressure Maintaining valve Silver | Diveinn This valve does not work properly anymore. I can not find a service kit. Of course Coltri does not answer any questions, they never ever do. Lousy.

Where can I get a service kit?
Or better: do you have a sectional drawing incl. o-ring sizes?

Thanks for your help.

 

[iain/hsm]

Coltri Pressure Maintaining valve Silver | Diveinn This valve does not work properly anymore. I can not find a service kit. Of course Coltri does not answer any questions, they never ever do. Lousy.

Where can I get a service kit?
Or better: do you have a sectional drawing incl. o-ring sizes?

Thanks for your help.

From your photo above you I can clearly see that the larger top O-ring in your picture is a Nitrile rubber 90 shore hardness O-ring commonly knowns as an AS 216 O-ring NBR 90

For the lower smaller O-ring in your picture this is commonly known in the industry as a Viton 70 shore hardness O-ring, And in the industry known also as a AS Number 120 So an AS120 O-ring Viton 75

For the internal parts however according to Coltri you are not certified or approved to service these internal parts and therefore need to replace the whole assembly with a new part from your existing scuba shop supplier Diveinn.
Diveinn I'm quite sure will be more than happily to sell you another replacement Coltri Pressure Maintaining Valve at £151.99

You even get a 9% saving from the original £167.02 price !!
No doubt for your continued custom and support
Just like Bauer with the Junior 2 relief valve internal service parts I guess

Now purely from an experienced engineering perspective you understand if you were to publish a photo of the internal parts of lets say a Coltri Back Pressure Regulator I'm sure an engineering eye looking at the photos would instantly recognise the size and AS numbers of the two internal O-rings and the PTFE back up ring. Unless Coltri, there agents Nuvair or this retail shop Diveinn have any objections in us discussing compressors as per our forums rules.

"This is where we talk about the machinery used to fill our scuba tanks!"

Albeit tanks are what the army drive I will forgive them just this once.

 

[Agro]

I have an o-ring list which sais:
- upper o-ring is 29x3.5 NBR90, this is close to 216 (28.17x3.53mm) NBR90. These o-rings can be exchanged, as they are static.
- lower o-ring is 25x2.5 NBR90, this is close to 120 (25.07x2.62) and can be changed as well. But it is NBR not Viton and it is NBR90, not 70.
This o-ring sizes are correct for sure. And they are metric like most of Coltri's o-rings. Italy uses metric system. But anyway 216 und 120 will work as well.

What I am interessted in are the other o-rings inside the PMV and the back up ring. Back up ring is not that important, I guess changing is not really necessary. But if I already open the valve I want to change those 2 o-rings.

If nobody has the correct size I will measure and compare to my Coltri o-ring list. If I find a Coltri o-ring close to it, it might be the right one.

But still I hope someone has a sectional drawing. I have a drawing of an other Coltri PMV, including o-ring sizes. So I still hope to find one for this PMV.

 

[iain/hsm]

I have an o-ring list which sais:

- lower o-ring is 25x2.5 NBR90, this is close to 120 (25.07x2.62) and can be changed as well. But it is NBR not Viton and it is NBR90, not 70.

Sorry but your wrong on this. Although it's a minor difference it kind of clobbers any attempt to help end users directly in self service of their own compressors and plays into the hands of those who would prefer you deal with the dive shop directly for them to do the service for you and another example of us all going down the same route as the system we have already getting spare parts for scuba regulators.

Now if your going to do your own servicing you had better make sure you use the correct parts although or if your happy with china junk then heck I guess any old junk will do and I can't help you.

But take another look at this list of yours as its wrong but I accept you may have mixed them up.
Although the smaller ring is indeed a 25.07 in ID by 2.62mm in cross section and a AS120 in size
The material compound is Viton 70 (or at least FKM junk) and its 70 shore in hardness.

I guess a good ophthalmologist (or optician) may help

 

[Agro]

As I mentioned those 2 o-rings are not of any importance to me.

I just found out the other o-rings:
- 3.69x1.78 NBR 90
- 6.75x1.78 MBR 90

Even Teflon spacer's dimension I know now: 1.5x7mm

There is an official Coltri service kit for 50 Euro, just got this information. I will not buy it of course, I will use those 2 o-rings (already on stock) and buy a teflon spacer.

Problem sloved, thank you iain for your help.

 

[Agro]

iain you are right. Just got a new Coltri o-ring list and there we have:
- 28.17x3.53 NBR 90
- 25.07x2.62 Viton 70

It seems my "official" Coltri product seller was selling non official Coltri o-rings, that's no good at all.

But nevertheless I will not use a Viton 70 o-ring on a high pressure application. Yes I know pressure differences in a filter housing are nearly zero but in this case we are talking about PMV so we can have a pressure difference of 150 bar. While adjusting PMV's pressure also can be 250 bar. An o-ring of 70 shore does not make any sense. Perhaps that's why exactly this o-ring broke on my PMV, it was an original o-ring. I will use a NBR 90 instead.

Great forum.

 

[iain/hsm]

I just found out the other o-rings:
- 3.69x1.78 NBR 90
- 6.75x1.78 MBR 90

Just when I thought we were going to solve the worlds Coltri spares problems one o-ring at a time lol

Now the tricky part as these are two different standards designed purely by Coltri to mess things up for the user owner service and steer you into using the dive shop overpriced service kits.

While the 3.69 by 1.78 is a standard AS 007 size
This 6.75 by 1.78 is a genuine pure metric O-ring size ( french probably)

While the international ISO 3601 standard does attempt to classify the British BS1806 and the American AS568 standards no one can second guess Europe and the French who in their wisdom decided to do their own thing and make specials of which this 6.75 x 1.78 is one of them. Blame the French.

 

[Tanks A Lot]

[...]second guess Europe and the French who in their wisdom decided to do their own thing and make specials of which this 6.75 x 1.78 is one of them. Blame the French.

Poor French getting the blame here, while the Italians smugly smile with their UNI 106 O-ring (1.78mm x 6.75mm).

For what its worth, the BS1806-610 comes so close as to probably not make a difference (1.78mm x 6.76mm)

 

[Agro]

6.75x1.78 is a very common o-ring in Europe, you get it everywhere.

Difference to 6.76x1.78 is probably rounding difference. Anyway it does not matter at all, 1/100mm is nothing. Less than nothing.

 

[iain/hsm]

Poor French getting the blame here, while the Italians smugly smile with their UNI 106 O-ring (1.78mm x 6.75mm).

For what its worth, the BS1806-610 comes so close as to probably not make a difference (1.78mm x 6.76mm)

LOL As I am the token Brit here on this purely American divers website I think I was being very polite against the French but I'm just as happy to lump in the Italians and while we are at it why not include you lot ROFL

But just to give the British unbiased and balanced overview I think that our American divers here may have a little trouble finding metric O-rings at the best of times let alone Italian UNI 106 junk copy stuff. Whatever next Japanese standards. ( Now I think that's a fully balanced viewpoint. Everyone referenced and I never once mentioned the war. )

Whatever next American divers on this forum buying from Alibaba and China""" Give me strength.
No wonder their President is jacking import tariffs on all those freeloading Chinese.

Screw the French it's the poor Americans divers I feel sorry for having to put up with so much Chinese fake and now this Italian junk stuff also.

Still I won't be buying an American electric car anytime soon I'm more than happy to continue tolerating another German brand. See how well we all get along together. Peace.