looking for a special valve

[marokay]

Hello,
I'm new here and I wanted to ask your help with something ...
I am looking for a valve that allows the flow of liquid but prevent air escaping out form let's say a sealed container ...
Is there such a thing?

 

[zdas04]

That would be asking quite a lot from a "valve". The normal way that people accomplish that task is with a "stinger" pipe that extends well below the gas/liquid interface. Then the pressure of the gas on the top of the vessel tends to push the liquid from low in the vessel into the stinger and out the top. The pressure on the top must be high enough to overcome hydrostatic head of the liquid in the stinger plus friction losses.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. —Galileo Galilei, Italian Physicist

 

[marokay]

Are you talking about "Vapor Liquid Separator " ?

 

[LittleInch]

Any valve linked to a float or level control would do that function.

You're not actually looking for a valve, what you need to look for is level control, the type of valve is irrelevant.

If you turn a ball cock from your toilet upside down it would do something like that



My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[gerhardl]

YES!

Any 'steamtrap' based on a float construction is especially constructed to do this. To get a proper answer you have to contact specialists (Spirax sarco, Gestra, Armstrong,.. a lot of others) giving details of your fluids and amounts for dimensioning and proper materials, including sealings.

Any movements/transport of the container to influence solution? Any requirements of allowable leaking amounts of air?

Note: piping layot and necessary additional components (checkvalves, isolating valves, filters) essential for a good solution.

 

[JJPellin]

We have valves that might work for your application. These are floating ball check valves that we use on the overhead seal oil tanks on our coker wet gas compressors. These are special ball-check valves with floating balls that allow vapor to escape, but seal off to prevent the flow of liquid. These valves could be installed on the bottom of a vessel to allow liquid to leave, but not vapor. We also have float mechanisms in contaminated seal oil traps that open to allow liquid to flow out, but close off to prevent vapor from flowing out. These look a lot like the toilet float mechanisms referred to above. But, ours are designed for 800 psig hydrogen gas.

Our floating ball check valves were manufactured by Vogt with the following description:

1” Vogt - Model #5-4853 – special steel flanged valve – 300# ANSI R.F. – with special 1-1/4” stainless steel hollow floating ball.


Johnny Pellin