Question Check valve for booster

[marc.collin]

hi

where are you get you o2 clean check valve?

or have you just took a check valve who use viton oring... put simple green and water inside?

thank

 

[rjack321]

Just buy them new from a proper reputable supplier with viton rings. If you really want, for tiny hard to work with parts like this, you can use a one-step degreasing process like an 90% + isopropyl alcohol wash followed by forcing clean air through them to dry. But that isn't really necessary, there is no grease in them when manufactured, just the Oring.

 

[Agro]

Are you 100% sure there is no grease in there? And no other contamination, such as grease from hands for ex? I would not bet my life on it.

Until now I found no check valve out of the box beeing 100% gas-tight, they all were leaking a little bit. Sometings right from the beginning, sometimes after a few month.

I produced check valves, using Poseidon parts: Zytel seat, rubis ball, spring. They are 100% gas-tight and last for ever.

If you use the check valve out of the box I would disassamble it completely and clean it very well. Simply washing out by green or isopropyl is not enough for my demand. But it's your decission.

 

[iain/hsm]

hi

where are you get you o2 clean check valve?
or have you just took a check valve who use viton oring... put simple green and water inside?
thank

Most companies compressing oxygen start by not using a stainless steel body with a stainless seat and without using a steel piano wire spring.

Now if your going above the 150-170 bar limits for gaseous oxygen the NRS1 data sheet below allows a Cv factor of 0.6 with a maximum working pressure of 414 bar (6000psi) and certified for Oxygen Use.
Certified Cleaned for Oxygen Service (and not oxygen cleaned) as there is a big difference between the two statements. British made the threads are BSPP 1/4G No PTFE tape. The oxygen version is Brass Bronze or Monel depending on pressure with the Phosphor Bronze spine

 

[justinthedeeps]

I got one that is steel and PTFE from McMaster to put on the supply side that hasn't been a problem yet. Slowly slowly

Something like this? (Away from station)

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

 

[marc.collin]

I got one that is steel and PTFE from McMaster to put on the supply side that hasn't been a problem yet. Slowly slowly

Something like this? (Away from station)

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

3000 psi max...

 

[Johnoly]

.. (6000psi) and certified for Oxygen Use.

While filling,,,I'll just be standing over here >>>>> 2 kilometers away.

 

[justinthedeeps]

3000 psi max...

Supply side? Who is doing oxygen supply cylinders over 3000 psi? Why not just go with readily available sub-3000psi sources (typical ABO fills) vs. trying to HP the whole system?

If fill side (booster output) ?
Many boosters already have internal check valves or a mechanism that prevents backflow? Which one(s) are we talking about?
I wouldn't boost high O2 mixes (≥50%) over 3000psi (nobody needs to for SCUBA), nor opening up anything at all over ~2000psi against an uncharged booster

 

[marc.collin]

Supply side? Who is doing oxygen supply cylinders over 3000 psi? Why not just go with readily available sub-3000psi sources (typical ABO fills) vs. trying to HP the whole system?

If fill side (booster output) ?
Many boosters already have internal check valves or a mechanism that prevents backflow? Which one(s) are we talking about?
I wouldn't boost high O2 mixes (≥50%) over 3000psi (nobody needs to for SCUBA), nor opening up anything at all over ~2000psi against an uncharged booster

dive store alway feeded my 2l and 3l to 3442psi...

 

[justinthedeeps]

dive store alway feeded my 2l and 3l to 3442psi...

Now this I think we can all get behind, shops willing to fill our CCR O2 HP cyls to HP spec are the real deal & deserving of endless gratitude

I guess if home/own-sourced boosting for a trip away from the fill station, or filling for others who scoff at a mere 3000 psi O2 fill, there could be a desire to fill over 3000psi.

Otherwise at ~1-1.2 litres/min consumption a 3000psi (207 bar) 3L fill is gonna last over six hours (with a 50 bar reserve to spare) and two or three of those is a pretty fun week(end) (?)