Metering(needle) valves selection for our CO2 pressurized system - Page 2
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Old 05-16-2011, 05:19 AM   #16
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Quote:
Originally Posted by Bettatail View Post
There is a Parker metering valve on evil bay right now, someone might go ahead and grab it.
it is the stainless steel NS model, flow precision is about the same as a swagelok M series metering valve.
Who bought it?

show the picture after you receive this valve, thanks.
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Old 05-17-2011, 07:06 AM   #17
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updated, about the solenoid valves
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Old 05-21-2011, 05:07 PM   #18
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Quote:
Originally Posted by Bettatail View Post
Who bought it?

show the picture after you receive this valve, thanks.
Alright, here you go:

Parker 4Z(A)-NSL-BN-SS-K



Flow control is somewhere between a swagelok 'm' and 's' series. So kinda like a fabco.
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Old 05-22-2011, 01:55 AM   #19
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Hoke 2315FAY 316 stainless steel high pressure metering valve, look really nice with large vernier handle, but not that precise.

On Evil bay, whoever want to give it a try can go for it.
320700608524 Evil bay ID.

and don't forget to post a picture if you get this valve
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Old 05-23-2011, 10:45 PM   #20
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Update, SMC needle valve
flow rate comparison at low turn range.

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Old 05-27-2011, 06:14 PM   #21
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Evil bay search key word for any model that available on the list:

Metering valve
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Old 06-10-2011, 05:38 AM   #22
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Well, I broke down and bought a couple metering valves via Evilbay. One seems to have been an especially good deal given what I bought it for versus the list price - an SS-4BMW. The catch: it's missing the metered knob. I'll email Swagelok in the morning and see if I can order one, as I don't see a part number in the catalog - just the specs for it. I'm wondering how much the price of it will offset what I saved by buying it sans parts. Though, it still seems to work as it should. And it's missing the nut-ferrule sets, though I already have the SS tube/NPT adapters for it.

The other, I took a chance on. It was quite cheap, and I can't find any information on it anywhere. B 22RS4. I'm guessing there was once a Swagelok 22 series that was discontinued?

Oh, and there are a bunch of used Hoke 2311F2B's for sale. They're used, and look like crap, but they're cheap as heck and I'm intrigued by the 20 turns to .075Cv. And it's already got 1/8" FNPT fittings, so no adapters necessary.

Couple questions. If I were to try to save some cash by buying any type of B-400 or SS-400 1/4" compression fittings, would they all theoretically come with the same ferrule sets under the nuts? I do realize that combining brass and stainless steel in a compression fitting is a bad idea.

And when tightening down the adapters, is there a rule of thumb on how far to go? With 1/4" tubing, Swagelok says to go 1 1/4 turns after finger-tightening. But how about with metal adapters? And once you tighten them, is there no way to remove the adapter from the compression nut? I realize the nut will still unscrew from the NPT thread, but the adapter doesn't seem to want to slide out anymore. Not a problem, just want to know if it's a bad idea to try to force it.

And one last question / comment: It seems to me that with the temperamental nature of diffusers, low flow metering valves might be less useful (or, in the case of extremely low flow valves like the SS series, possibly useless?) when using a diffuser rather than injecting straight into some type of reactor. Comments?

Useful Swagelok parts:
SS(B)-4-TA-1-2 male adapter, 1/4" tube X 1/8" MNPT
SS(B)-4-TA-7-2 female adapter, 1/4" tube X 1/8" FNPT
SS(B)-400-NFSET 1/4" nut-ferrule compression set
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Old 06-10-2011, 08:35 AM   #23
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Yes, swagelok double ferrules design use the same ferrules, materials can be stainless steel, brass, or nylon.
There are Tylok, Hamlet, A-lok(parker), and some others make the same ferrules, since the swagelok double ferrules pattern right has long expired.
Avoid gyrolok, it is double ferrules, made by HOKE, but the ferrule angle is different from swagelok and others.

you can use the single ferrule adapters also, if the ferrule port connect to the tube.(not single ferrule on a double ferrules port)



second question is easy to answer, same installation(same turn) for double ferrules fittings/adapters. But I always hand tight, then wrench turn a little bit, once feel the resistance(ferrules brace the tube), then 1/4 of wrench turn(ferrules press in the tube), because 1 1/4 turn is guarantee for 5000 psi application, we don't have that much pressure in the tube and 1 1/4 of turn is too much. Tighten too much, later on there is no more space for unscrew and re-tighten.
---you can unscrew the nut and remove the components, but the ferrules are pressed in on the tube, can't be removed. re-tighten you need to hand tight then 1/8-1/4 of a turn, wrench tight. Each time do the same, until there is no more space to re-tighten.




The CO2 flow in our application is really a SLOW flow, we have to use any metering valve(needle valve) at under 1-2 turn range.
so a low flow metering valve is easier to adjust the bubble rate.
some metering valves are small CV but not as precise as other same CV metering valve at low turn range. Example, the high pressure metering valves, small CV at full open but at low turn is not as precise as regular low flow metering valve, because the orifice/stem angle is big.
and the Below valve you just bought, is not as precise as other low flow metering valves(same CV at full open) at low turn, but it will get the job done.
And you have a $250(when new) below valve for your bubble rate control.
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Old 06-17-2011, 09:09 PM   #24
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Updated, new data add.
Swagelok 21 and 22 series metering valve.

And thanks to kevmo911, if it is not him, the 21 an 22 series metering valves were still buried in the dust( I have a 21 series metering valve was in the junk box, now I know it is one of the most useful for precise low flow control)
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Old 06-23-2011, 08:58 AM   #25
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Update
Pneumadyne(Pneumatic Control System), 700 series needle valve

again, kevmo911 find another needle valve that good for our use.
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Old 06-24-2011, 04:46 PM   #26
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Pneumadyne 700 series needle valve,
Evil bay ID:
320657537595
Grab it if you need it.
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Old 07-06-2011, 11:30 PM   #27
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HOKE MILLIMITE 1300 series metering valve, 1 degree stem angle,
this is a brass version

Evil bay ID:

170664739045
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Old 07-06-2011, 11:41 PM   #28
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In line brass or SS FPT check valves are priority vs the cheapo in line airline fittings.

I do not think you will do better than Ideal valves.
Burkets have not failed in any apps, clippards have,

I have some older Nupro and Swageloks with the vernier handles. I like these, but the ideal still kick butt.

Swagelok 1/3 psi crack pressure check valve or the clippards are good as well.
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Old 07-07-2011, 05:28 AM   #29
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I have a few things to add to this cool discussion.

I had a Swagelok SS-SS2-D when I set up my first co2 system. When I brought it into the local Swagelok to get the hose barb fittings to put it inline with co2 tubing they looked at me like a crazed animal when I told them I was going to use it on my fish tank to control the bubble rate of co2. They said this valve was normally used on gas spectrum analyzers (could have the wrong name there but pretty much a machine you would see on CSI that would be used in the forensic lab) and cost over $600 new! It was too much of a pain to adjust so I sold it.

Now this is the Swagelok valve I have and I cant remember what model it is. It is used inline with a Crappard solenoid and a Victor regulator. Please if you know what model it is let me know.



Here is the whole system. Please refrain from laughing too hard at the mess that resides in my stand...





At work I have a Concoa regulator, Burkert solenoid (no where near as hot as the Crappard), and a beautiful Chrome plated Ideal valve (I got lucky and was contacted by a member when he needed to fill a minimum order reqirement to get them to do a small number of Chrome plated valves).


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Old 07-07-2011, 05:39 AM   #30
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Quote:
Originally Posted by Bettatail View Post
HOKE MILLIMITE 1300 series metering valve, 1 degree stem angle,
this is a brass version

Evil bay ID:

170664739045
Wow! the price is $125!

Ideal V. is about $85 when I bought it.
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