Fixed Valve Plate

[Tammuz]

What about making a sieve plate with 8-9% opening. Then take a thin sieve plate with 6-7% opening and just place that on top so that it floats on top of the bottom plate.

[Tammuz]

Duplicate post

[subbrew]

For the valves I think copper rivets would work. You could slightly bell the bottom so they did not pop clear out. I don't know what sort of weight they would need to operate efficiently.

[Tammuz]

Maybe stainless steel rivets would work better. We tried copper with different amount of slack by using different hole sizes. Running rum on spirit runs by the third run they were sticking. Maybe a different designed rivet with a larger head would have worked.

[acfixer69]

I made these 10 or so years ago

CIMG1432.JPG (12.12 KiB) Viewed 1263 times

They worked fine, I only used them for spirit run and they had a great turn down rate.

They are not a fixed valve plate,but I'm not sure what a fixed valve is.

[shadylane]

Have multiple long slits in the plate and have soldered on Z strips to direct the vapor blowing into the reflux.

[shadylane]

Since the post has drifted a little from fixed plates. Here's a valved plate I did awhile back.
It needed several more valves and more open area to work faster or have lots of extra small perf holes between the valves.
It would start and load just like a well designed bubble cap plate.
Turn on the power and reflux water and the plates would load top to bottom as you watched with no drama.

[Yummyrum]

Well so far its about plates that have more operating range than the basic perf plate without the added complexity of a bubble cap plate.

So would I be right in assuming that the turndown of a fixed valve plate can only be as good as a perf plate assuming both have the same open area . (IE with the same open area , both need the same minimum power to hold liquid )

Therefore , increasing operating range can only be done at the turn up end . And this is the idea of shooting the vapour sideways into the liquid rather than straight up .

[Yummyrum]

Have multiple long slits in the plate and have soldered on Z strips to direct the vapor blowing into the reflux.

That would be fairly easy to do Shady . Cut slots with a cutoff disk . Z strips easy to bend . Wouldn’t need to be thick copper .

[shadylane]

So would I be right in assuming that the turndown of a fixed valve plate can only be as good as a perf plate assuming both have the same open area . (IE with the same open area , both need the same minimum power to hold liquid )

Therefore , increasing operating range can only be done at the turn up end . And this is the idea of shooting the vapour sideways into the liquid rather than straight up .

Entrainment would be less of a problem.
I think due to the vapor being blown sideways, the reflux can't drain down the sieve holes as easily.
Therefor a wider range of operation would be possible.
Long story short it would be somewhere in between a bubble cap and sieve plate.

[shadylane]

Have multiple long slits in the plate and have soldered on Z strips to direct the vapor blowing into the reflux.

That would be fairly easy to do Shady . Cut slots with a cutoff disk . Z strips easy to bend . Wouldn’t need to be thick copper .

I haven't tried it yet but it looks good in theory.

[Swedish Pride]

Have multiple long slits in the plate and have soldered on Z strips to direct the vapor blowing into the reflux.

That would be fairly easy to do Shady . Cut slots with a cutoff disk . Z strips easy to bend . Wouldn’t need to be thick copper .

I haven't tried it yet but it looks good in theory.

Sure does, can't beat a visual representation.

Looks less hassle than drilling a godscillion holes in a plate.
Cheaper too, the way I snapped drill bits anyway

[googe]

Cool subject LWTCS, I like zacks pic. No moving parts. So, are you after a plate that has the action of perfs and bubble and valve? I see no issues with no downcomer if you have flow right, would only take a bit of Science which is abundant here. I did it easy with the flap plate and I'm dumb as shit lol