Needle Valve - Swagelok S Series not cutting it!
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > Specific Aspects of a Planted Tank > DIY


Reply
 
Thread Tools Display Modes
Old 12-30-2012, 05:48 AM   #1
DeadlyMuffin
Algae Grower
 
PTrader: (0/0%)
Join Date: Nov 2012
Location: San Jose, CA
Posts: 22
Default

Needle Valve - Swagelok S Series not cutting it!


I put together a DIY CO2 regulator setup that I'm having trouble with. I'm using a Victor regulator, and a Swagelok S series (SS-SS2-A to be exact) valve to meter the CO2 flow.

With the regulator set at 10psi, which is as low as I can get it, I'm getting more bubbles than I want even with the valve completely closed.

Has anyone else used S series valves in this kind of setup? Does it sound like I've got a defective part, or the wrong part for the job?
DeadlyMuffin is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-30-2012, 06:23 AM   #2
Darkblade48
Moderator
 
Darkblade48's Avatar
 
PTrader: (3/100%)
Join Date: Jan 2008
Location: Toronto
Posts: 9,190
Default

Just curious as to why you have the needle valve before the solenoid...most people have it the other way around.

Also, I used the exact same metering valve and was able to get it down to 1 bubble per 3-4 seconds.

I do not believe that particular metering valve was designed to be closed completely either, so if you did, it may have damaged it.
__________________
Anthony

A Primer to Pressurized CO2 and A Primer to Planted Tanks
Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Eheim 2217, Eheim surface skimmer and Eheim autofeeder.
Victor Pimp #33 - HPT272-125-350-4M
Darkblade48 is online now   Reply With Quote
Old 12-30-2012, 06:28 AM   #3
DeadlyMuffin
Algae Grower
 
PTrader: (0/0%)
Join Date: Nov 2012
Location: San Jose, CA
Posts: 22
Default

I put it in front of the solenoid because it was convenient with the parts I had. I don't think it it makes a difference.

I read the Swagelok writeup on these valves, they have a stop to keep them from being closed too far and getting damaged so I'm skeptical that I damaged it that way. It was bought off ebay though, so who knows what the previous owner did to it.

What was your pressure behind your valve? If my regulator went lower than 10psi I'd be able to drop the flow rate that way.
DeadlyMuffin is offline   Reply With Quote
Old 12-30-2012, 07:39 PM   #4
Bandit1200
Planted Tank Enthusiast
 
Bandit1200's Avatar
 
PTrader: (4/100%)
Join Date: Dec 2010
Location: Houston, Texas
Posts: 600
Default

In my experience the lower the psi, the harder it is to get a consistent flow rate out of the system. I usually run mine in the 15-20 range.
Bandit1200 is offline   Reply With Quote
Old 12-30-2012, 07:42 PM   #5
oldpunk78
ಠ_ಠ
 
oldpunk78's Avatar
 
PTrader: (106/100%)
Join Date: Nov 2008
Location: 96007
Posts: 5,255
Default

Those things come from the factory so that when closed, it's not really closed. You'll need to take the handle off and reset the zero point to what ever you want. Know that it's easy to break the needle off if you close the valve completely.
oldpunk78 is offline   Reply With Quote
Old 12-31-2012, 12:21 AM   #6
Darkblade48
Moderator
 
Darkblade48's Avatar
 
PTrader: (3/100%)
Join Date: Jan 2008
Location: Toronto
Posts: 9,190
Default

Quote:
Originally Posted by DeadlyMuffin View Post
What was your pressure behind your valve? If my regulator went lower than 10psi I'd be able to drop the flow rate that way.
I could still adjust it with a delivery pressure of 5 PSI.
__________________
Anthony

A Primer to Pressurized CO2 and A Primer to Planted Tanks
Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Eheim 2217, Eheim surface skimmer and Eheim autofeeder.
Victor Pimp #33 - HPT272-125-350-4M
Darkblade48 is online now   Reply With Quote
Old 12-31-2012, 12:28 AM   #7
DeadlyMuffin
Algae Grower
 
PTrader: (0/0%)
Join Date: Nov 2012
Location: San Jose, CA
Posts: 22
Default

Quote:
Originally Posted by Darkblade48 View Post
I could still adjust it with a delivery pressure of 5 PSI.
That's probably the difference. I can't get much lower than 10psi with the regulator I'm using.

Quote:
Originally Posted by oldpunk78 View Post
Those things come from the factory so that when closed, it's not really closed. You'll need to take the handle off and reset the zero point to what ever you want. Know that it's easy to break the needle off if you close the valve completely.
You're right, they're not designed to completely close. I didn't know they could be modified though! I didn't see how to do it from the diagram on the Swagelok site, how do you get it apart?

edit: Do I loosen the top set screw, unscrew the handle slightly, then retighten the set screw? That would put the handle slightly higher up on the stem.

Last edited by DeadlyMuffin; 12-31-2012 at 12:42 AM.. Reason: I looked at the diagram
DeadlyMuffin is offline   Reply With Quote
Old 12-31-2012, 03:05 AM   #8
oldpunk78
ಠ_ಠ
 
oldpunk78's Avatar
 
PTrader: (106/100%)
Join Date: Nov 2008
Location: 96007
Posts: 5,255
Default

^ basically, all you have to do is loosen the Allen on the end and slide the handle out until you hit your lowest desired rate. Move it too much and tighten it down too hard and you'll break it. Go in small increments.

If set correctly, you'll have about one turn to from zero to about one and a half bubbles per second.
oldpunk78 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 09:49 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012