Here's the information I gathered, while I was doing research. Hopefully, it will help someone save some time...
Setup and testing
Roberts Gas, locally
Do not look for a fancy cylinder, like aluminum etc. Because there is a good chance that the local gas supply guys will simply swap your cylinder instead of filling yours up. Can search craigslist, but make sure it has a non expired hydro test stamp on it.
Go for a 10 lbs one, usually 50 bucks plus 15 shipping.
Search ebay for gas regulator, do not search for dual stage. Look for Matheson or Concoa. Sort by lowest price.
Then cross reference what is available vs their catalog part numbers
400 series dual stage, like 412, 414 etc. Stainless steel does not matter. Simple brass is ok
This could be cheaper because most of the ones on eBay are actually obsolete. That is fine for our purpose. Look for dual stage
Note: Look at the low pressure gauge carefully. Don’t buy the one which has a gauge which reads –30-0-30. That model can supply an output pressure of half the full scale reading which is only 15 PSI
I ordered a 3014C for $30, shipped
Has 1/4" NPT female ports
CGA-320 nut + nipple:
If you get lucky, your regulator may have a 320 connector which is needed for C)2 gas cylinders, but most probably it does not. You need to get one. Check the inlet port threads first. My Matheson has 1/4" female NPT threads
I ordered one for $9.45 on eBay
Lots of different metering valves are available. Easily found one is the Fabco NV55. That is what come in many kits. People say Ideal is better.
Look for Ideal V 52-1-XX model < better but more expensive
11 is straight
12 is 90 degrees
V 52-1 cannot be found on the internet. I called Ideal straight, they sell it for 100 + 7.50 shipping. That is a little too high for my wallet. So I went with the V52-2 on eBay. BTW, the guy said do not buy the 52-2 version that is too big. He also said go with the non vernier version, as the vernier is not really needed and is 20 bucks cheaper.
There a couple of guys saying that the v 52-2-x model is also OK, here
Bettatail lists a ton of valves in the first post here (thank you!)
Ideal V52-2-12 <<<<<I bought this one
$42.39 shipped, from eBay
Forged Brass Needle Valves | Ideal Valve Inc.
Update after using valve
I now feel that the advice given by the Ideal guy was correct. The Ideal V 52-1-XX model is the right one to get. The Ideal V 52-2-XX model works but I have to tweak it extremely carefully. Just a slight turn and lot of bubble rate change.
Fabco NV-55-18 << Around $46 on ebay
I hear that it is best to find one which uses less power. They usually heat up and die...also waste power.
Numatics LS solenoid LS03M6F00V, part number : 264462700396
Very little options on eBay for this part, and it can get a little expensive - like 35 dollars on eBay plus it needs a manifold also…which is around 20 bucks extra, shipped.
Clippard EC-2-12 < inline mount
Clippard EC-2M-12 < manifold mount, this is the one they sell here:
Simply get this set for $43
Specs of this solenoid:
Comes in many part numbers
Again, hard to find, nothing on eBay
Needs a manifold - clippard 15490-5
You will need various fittings, nipples, reducers etc to connect all these things together. A simple place to find all you need is:
Quick things to keep in mind:
NPT is the same thing as MPT.
MPT is usually for male pipe thread
FPT is usually female pipe thread
You can get a $10 bubble counter which will fit straight to the output of the metering valve. Has 1/8" NPT female (need confirmation). So you just need a 1/8" male-male nipple. This usually comes with a check valve inbuilt. Not sure how good that valve is, though.
Brass ones are also available for $17, probably is a good idea since the metal to metal contact should be similar metals.
Some people just use airline tubing. CO2 resistant tubing should be better
I found 16 feet for $10 shipped on eBay.
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