6000# needle valve - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 02-19-2015, 11:49 AM Thread Starter
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6000# needle valve

Anyone try a heavy duty needle valve on their co2 without a regulator?
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post #2 of 9 (permalink) Old 02-20-2015, 12:09 PM Thread Starter
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Nobody buys a needle valve rated for 1000+ psi? Those watts are like what, around 300?
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post #3 of 9 (permalink) Old 02-20-2015, 12:22 PM
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Originally Posted by adamfish View Post
Nobody buys a needle valve rated for 1000+ psi? Those watts are like what, around 300?
Needle valves.. or more correctly metering valves are more complicated than you think. There are more stats than just psi.. Needle valve orifice and gas flow parameters come into play..
Even in the 1300 series a 1 degree needle is better than a 3 degree neddle

You need precise flow not just bull work..

http://catalog.hoke.com/Asset/Meteri...g-79013ENG.pdf

The Hoke millimite and micro-mite series both have a high pressure rating 3000psi AND the small orifice needed.

The 2300 is already too big for any decent control.. esp w/ out a regulator..

Tavern and bar supply shops should have a fairly cheap 1 stage reg . Add a precision needle valve and all the fittings you are good to go..

Bottom line, a needle valve is not just a needle valve. They are pretty specific for our low volume high-ish pressure work..
I don't see any good coming from bypassing a regulator to regulate the gas supply..First you control the pressure then the supply volume..an unavoidable 2 step process..

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post #4 of 9 (permalink) Old 02-20-2015, 01:15 PM Thread Starter
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I just figured you'd have more turns of the needle hence better control, but I see there's no way around a regulator, guess I'll have to bite the bullet.
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post #5 of 9 (permalink) Old 02-21-2015, 01:36 AM
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It would be very difficult to get the flow under control with that high pressure over the valve. Needle valves with high pressure ratings are not necessarily used to create a small flow with a high inlet pressure and a low outlet pressure but rather to control flow when the pressure is high on both sides of the valve.

I use a 2000psig (low pressure :-) Swagelok S series 1 deg needle valve I pulled out of the trash at work but I only need to open it a few turns when I have the regulator set to 25psig even though the needle is the smallest taper they make. A regulator is only $20-30 on craigslist. Any old welding regulator will work. The magnetic valve is harder to find really cheap but you can find them on [Ebay Link Removed] The valves used in MIG or TIG welders will work fine.

Ulf
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post #6 of 9 (permalink) Old 04-23-2015, 02:40 PM
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Quote:
Originally Posted by jeffkrol View Post
Needle valves.. or more correctly metering valves are more complicated than you think. There are more stats than just psi.. Needle valve orifice and gas flow parameters come into play..
Even in the 1300 series a 1 degree needle is better than a 3 degree neddle
When it says 1/4 is that the ID or OD of the outlet?
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post #7 of 9 (permalink) Old 04-23-2015, 05:00 PM
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When it says 1/4 is that the ID or OD of the outlet?
I can be the OD, if it says 1/4 tube, but if it says 1/4 pipe, or NPT, then it is neither ID nor OD. I'm not sure where pipe sizes originated, nor how the size was determined.

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post #8 of 9 (permalink) Old 04-23-2015, 05:14 PM
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1/4" tube is ID
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post #9 of 9 (permalink) Old 04-23-2015, 05:24 PM
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That info is very helpful.

Found NPT OD here.
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