Looking at a check valve running from the CO2 regulator. So I have a few questions I trust you to answer. I'm guessing it varies, maybe 5psi but what cracking pressures are common to check valves off of a CO2 regulator?
I'm looking at a pair of 0.25", Parker 4Z-5's w/compression fittings. Validate my misgivings. Why am I hesitating? Are they worth $45.00? Compression fittings? I think i'ld rather have 0.24" pipe thread.
Are used check valves, worth the risk. Can they be repaired?
Buying used CO2 Equipment.
Buying used CO2 Equipment.
Last edited by tug on Mon Mar 31, 2014 11:42 am, edited 2 times in total.
Greater Washington Aquatic Plant Association
Mixed with the sound of water's murmuring
a sensitive plant in a garden grows.
Mixed with the sound of water's murmuring
a sensitive plant in a garden grows.
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Cristy Keister
- Posts: 2226
- Joined: Sat Nov 29, 2003 6:52 am
- Location: MD
Re: Buying Used Stuff
Good question. I have no idea. 
Re: Buying Used Stuff
You want an inline check valve or one attached to the regulator?
Look for 1 psi or even 1/3 psi cracking pressure. If you look on ebay you can find the Parker ones for $20 or even less.
Look for 1 psi or even 1/3 psi cracking pressure. If you look on ebay you can find the Parker ones for $20 or even less.
Re: Buying Used Stuff
Thank you. Of course I haven't anything specific in mind. Just trying to understand what options are appropriate for what we do. I'm guessing NPT for attaching to the regulator, compression fittings for inline would make sense. Is it as simple as all that?
Is there anything else to be aware of?
What check valves do you use/recommend?
Thank you, again.
Is there anything else to be aware of?
What check valves do you use/recommend?
Thank you, again.
Greater Washington Aquatic Plant Association
Mixed with the sound of water's murmuring
a sensitive plant in a garden grows.
Mixed with the sound of water's murmuring
a sensitive plant in a garden grows.
Re: Buying used CO2 Equipment.
Check valves are pretty critical for me; my only tank is in my living room. I use the clippard ones. And I use two of them!
Re: Buying used CO2 Equipment.
1/8" NPT fittings seems to be the way to go. The biggest reason being that the low wattage solenoids tend to use 1/8" NPT. If you want to run CO2 24/7 you could use 1/4" NPT fittings are good metering valves are often easier to find in 1/4" NPT than 1/8" NPT.
If you're looking to build a nice dual stage regulator like you see on TPT and APC and such the hardest part is finding a good deal on metering / needle valves. Start there and work your way from there.
If you're looking to build a nice dual stage regulator like you see on TPT and APC and such the hardest part is finding a good deal on metering / needle valves. Start there and work your way from there.
