4500 psi rezzy bottles for PCP and bottle conversion guns ? Group Buy?

[3BI5]

Not user adjustable was the answer from JDS for me too. I bought the bottle adapter and reg for marauder so I quess I'll find out how it works in a couple of weeks.

[Job]

Only acquire or make this part (vice versa) http://www.bestfittings.co.uk/shopexd.asp?id=643  for this bottle, but it is an additional cost and weight  , should contact the manufacturer to make 5/8"-18NF thread.

[rsterne]

That adapter is backwards to fit a Nina reg. on those Chinese tanks.... You need 5/8"-18 female, to fit the reg., to 18 x 1.5mm male, to fit into the tank....

Bob

[dyotat100]

They are all user adjustable. You have to have a way to check the output of the reg. I have made a few adapters to test regs and set desired pressure.

You can get shims at McMaster Carr. It's funny how the companies all use the same thickness of shim no matter what the set pressure is. I have found that going to the next thicker shim makes a big diffence on how the good the reg works. Able to stack like ()()()()() instead of ((())) or this (((()))).

[Job]

It should open new topic, We're off to the Chinese regulators.

[3BI5]

Yes I know they can be adjusted, no mather what the seller says. For me it's a question of which will be a better/safer option: play with the JDS reg to get the needed plenum pressure or disable the JDS reg and use an easily adjustable Huma reg in the remaining marauder airtube. As the only reason I bought the JDS parts is to get the cf bottle fitted to my marauder. It's a bullpup setup so there will be a plenty of plenum size even with the Huma in the remaining airtube.

[rsterne]

Instead of disabling a regulator, just remove it and use an adapter from bottle to gun.... basically a hollow bolt, with a thick enough wall to be safe....

Bob

[3BI5]

Do you know anybody who could make me such an adapter? It is the obvious choice, it could even shave an inch of the oal lenght of the assembly. It would need to have a port for the fill adapter and pressure gage though.

[rsterne]

They are already available.... PM PakProtector, he designed one built into a tank block, which you need to drop the bottle down to clear the barrel....

Bob

[Joe Brancato]

I hesitate on writing this, as it may appear self-serving.  That is definitely NOT the intention. I don't sell those tanks, so it's no competition to me.  But I MUST say this:

I have purchased just about EVERY 4500 PSI compressor from China, and they were all junk.  While individual units of my Alpha and other brands have continued to work, the Quality Control wasn't there and too large a percentage fail.  So, what does this have to do with tanks?  QUALITY CONTROL!

Simply put, I don't trust their QC, ESPECIALLY for PRESSURE VESSELS.  I could have gotten Chinese tanks years ago and saved a bunch, but think about this:  "Who are you going to sue if one of those tanks blows up?".  If a U.S. tank blows up, you sue the U.S. manufacturer (they have the pockets).  You think you can sue someone from Alibaba that is located in China?  It ain't gonna happen (if you survive).

Yes, you can flame me all you want if you disagree, but I honestly would not trust any carbon fiber tank from China. Is the savings REALLY worth it? 

[farmerjoe99]

It also would be worth contacting a US dealer of these small CF tanks and seeing
if you bought xx tanks in a group buy if they would be willing to give you a one
time discount seems like they might a least give you a small discount for going through them
instead of someone else...?

[Sfttailrdr46]

I am probably going to get in trouble for saying this, but I am reluctant to purchase anything when I know that it came from across the Pacific. I have had problems with all kinds of plumbing and heating products manufactured over there. Brass fittings cracking from 60 psi water pressure . Steam cast iron base board getting stress cracks in non load bearing areas of the casting cost my boss at the time to replace with US manufactured cast iron base board and we had to re do the entire job at no cost to the customer. I definitely would not trust my life to a HPA vessel charged to 4500 PSI that came from there especially if I was going to rest my hand or cheek against it