Tesla Valve

Nikola Tesla's valvular conduit is another one of his forgotten inventions. Invented in 1920 it has largely been overlooked. What is it? In simple terms it is a one-way valve. That in itself is not special. What makes it special is the fact it has NO moving parts. Think about that for a moment.
How does a valvular conduit work?
The design uses a particular shape. When the gas/fluid flows in one direction it changes direction slightly, in a zigzag way but is relatively unrestricted and does not find much resistance. However, when it flows in the other direction because of the design, the gas/fluid gets spilt into two. These flows then end up meeting almost head on. This causes some resistance. This is repeated numerous times, each time reducing in pressure/flow. This type of valve is never going to work as a seal for your wine bottle, it simply does not work that well at low pressures. However, when high pressures are used it comes into its own and the ratio between two directional flows gets higher and higher.
Why did Tesla invent it?
Tesla invented the valvular conduit around the time he was doing work with Tesla turbines. It seems to compliment his work with Tesla turbines rather than being a separate invention. Tesla turbines are primarily concerned with laminar flows (steady flows) and work better at higher pressures. Experiments show that the Tesla valve on the other hand works best with pulsed flow. In fact it becomes highly effective with high pressure pulsed flows.
How to use it
Amazingly a valvular conduit can be demonstrated just by blowing into it. Blow in one end and not much passes through. Blow in the other end and air passes through much easier: The higher the pressure the more of the restriction. How does the gas/fluid get stopped if there is nothing mechanical to get in the way? The answer is bizarrely simple. The gas/fluid itself becomes the physical restriction.
When is most effective?
At high pressures.
For more information, see www.grand-illus...

[@gblargg]

The key aspect is that it has no moving parts to wear out. No rubber diaphragms etc.

[@chemetron3826]

I imagine there would be incredible erosion with prolonged use

[@lucasljs1545]

@@chemetron3826 no. If you mean decades of use, probably some minor erosion. But any valve would have turned to scraps in this time span.

[@dkdanis1340]

Check valves last just like any other part of machine no problems.

[@RiseOfD3ath]

Would a stolen one be called an Edison Valve?

[@hexadecimal973]

RiseOfD3ath nailed it

[@extensionflexxin1482]

RiseOfD3ath no? It would be a DARPA / Jp Morgan Valve.

[@Mikdeelow]

RiseOfD3ath FUCK EDISON!

[@hawk7825]

Rotfl 😂

[@TylerHarney]

True!

[@nexxusnexxus1167]

If you have ever taken a fluid power systems class, you will realize just how amazing this is

[@stmounts]

Mitchell Nola Amazing? Maybe, but relatively useless.Most of the time you want valves that can shut off completely. Also, all those vanes mean it probably has considerable restriction to flow in the forward direction, making it even more useless than conventional valves. That said, it might have some niche applications, maybe in a pulsejet? .

[@Nayr747]

Mitchell Nola From someone who hasn't taken that class, why is it so amazing?

[@stmounts]

iamabsFTW Yeah, but Tesla's valve has been around for nearly 100 years and guess how many applications it has found? Hint - You don't even need one hand to count 'em! It is merely a curiosity, in the real world it is a FAIL!

[@THEfromkentucky]

stmounts I'm pretty sure that's because it was lost for most of the last century.

[@stmounts]

fromkentucky Nope. It has nothing to do with being 'lost'. It has everything to do with being 'USELESS'.

[@lionharehart]

I read about the Tesla valve but never witnessed it, in video no less. Ta! He continues to be an inspiration for generations.

[@RFC-3514]

He's only an inspiration until you actually look at what he did (short version: he was great at designing transformers, but a complete hack in every other aspect, and clueless about physics in general).

[@kozert]

It would be very interesting to see, what happens if you fill the baloon with smoke and film the whole thing with a slo-mo cam!

[@killboi207]

Try filling it with ignitable gas and lighting it on fire :D. You can find vids on Tesla valves all over KZbin. He was WAAAAAY ahead of his time.

[@linewire04]

Slo-Mo guys did this with fire

[@Milamberinx]

@@killboi207 he wasn't ahead of his time, he was exactly of his time, he was inventing things on the cutting edge of technology but that's where you've got to be to invent things.

[@ceyhuyri8itu4vrcsxxfghvjkn3]

@@killboi207 èe

[@ME0WMERE]

@@Milamberinx by that logic no one was ever ahead of their time

[@johnclavis]

This is the most interesting thing Mr Tim has ever shown me.

[@mamaproxy]

I always find myself coming back to this channel because it's so entertaining.

[@markchisholm2657]

I note that it is stated that this is a forgotten invention but I'm not entirely sure that is the case. Turbines (and other high speed gas/fluid) pumps often use labyrinth seals which work in essentially the same way, relying on turbulent flow to prevent leakage across the seal. There is no actual physical contact between the sealing faces.

[@leomadero562]

This is by no means a "forgotten invention". It is applied in a lot of different areas and even Tim has one, it just isn't as viral as the Tesla coil or lightbulb. Tesla also has a steam power generator, which isn't necessarily forgotten either.

[@clutch1141]

Mention Tesla then sit back and watch the chaos that ensues.

[@johnnyllooddte3415]

this is why its still sitting on the shelf after 100 years....worthless toy

[@thedroplett214]

wrong. is a valueble one. but not having any moving parts nothing breaks, thus the valve doesn't need to be replaced by buying a new one.

[@michelerny4820]

johnny is a idiot ass boy, it's called a science toy ya idiot.

[@michelerny4820]

And once I make this comment I kno somebody could come along and be a idiot and criticize the criticizer

[@Ken2234]

johnny llooddte Whats wrong does Tesla make you feel stupid?

[@mfaizsyahmi]

I never imagined the words Tesla and Valve coming together in one phrase. Almost expecting a battery-powered solar Steam machine running HL3 for a moment

[@MrShinobiguy]

mfaizsyahmi. keep dreaming bub

[@frtard]

mfaizsyahmi. Solar panel + laptop

[@otakuribo]

That's been confirmed. It's legit and official. ( ͡° ͜ʖ ͡°)

[@IvanEedle]

Jason. bruh Tesla was an engineer, not really a scientist.

[@katt2002]

if you see Da Vinci, he invented various things and not just in one science field.

[@oliviermatan8832]

Just so you know, people who say this thing is useless: try to make a ball or regular check valve that lasts 100 million cycles (much like your car cylinder exhaust valve, that's about how many times it opens and closes in your car's life), but that works at 1200 or 1500°C instead of the regular 750°C of a steel valve. At those temperatures, steels creep, like chewing gum. You have to use ceramics or refractories like tungsten...which have the bad habit of breaking when subject to repeated shocks, which ball valves inevitably produce. This means any ball valve at such temperatures will break after about 0.1% of its intended life. The only solution is a valve with no shocks, i.e., no moving parts. Increasing the temperature, in turn, is the way to increase engine efficiency and decrease CO2 emissions worldwide. Finally, at the speeds of an engine, turbulence is so great that the forward and backward speeds in this tesla valve will be wildly different. Which means it will work more than well enough. And if you design your engine well enough, the valves are the only things that really stand in your way. Once the moving parts there are gone, you are free to increase the temperature, and therefore, increase the efficiency. See this report for example: www.energy.gov/sites/prod/files/2014/03/f13/pm047_muralidharan_2013_o.pdf So...who's laughing now?

[@Sam-kj9ui]

This is the one of the only one-way tubes that can transfer liquid in only one direction without the need of mechanical or moving parts.

[@davids3539]

Not _only_ one direction, just far more resistance one way.

[@NoFutureForG0uda]

@@davids3539 i believe all valves leak

[@davids3539]

@@NoFutureForG0uda Not continuously like this one.

[@cBodhi]

this is not a backflow preventer...it will slow the pressure but it doesnt have shutoff. the only way you can have 1 direction flow is with some sort of backflow prevention; youre right tho it would be mechanical even if it's a simple swing check valve it's got a hinge on it.

[@jd35711]

except it doesn't actually work

[@Simendal]

Finally a video where we get an explanation!

[@rayneweber7636]

they now use 3d printed Tesla valves to pump water in Africa, no moving parts means a sturdier valve.

[@tonyromano6220]

It is a valve, not a pump.

[@lucasljs1545]

@@tonyromano6220 they put the valve on the pump to decrease stress on the pump with back-flow liquid which can damage the pump. But some places do use Tesla Turbine to pump water.

[@no_handle_required]

finally someone using gas instead of liquid for the demo. Well done.

[@biz_markie9189]

Well, I've learned what a Tesla Valve is and how it works today. Thanks, Tim!

[@OhighOSkater]

You truly brighten my days with your videos and interesting things you’ve collected. Thank you. I really appreciate you and I hope you’re doing well

[@bobomob111]

I can think of a few applications. The long profile and inability to adjust or reverse flow direction hinders its usefulness somewhat but it would be a natural fit for shock absorbers. Im sure somebody with more time on their hands could think of a way to use this to replace one way valves that must operate at very high cycles per minute, like in engines.

[@johnnyllooddte3415]

worthless this is why its still sitting on the shelf after 100 years

[@SamEvansCOM]

johnny llooddte please go away if you don't like it why are you on this video? Nice turtle neck though

[@SchiwiM]

It could be useful as a shore protection measure, to let the river flow downward and keep the tide out

[@nauelymili3728]

Ain't it used in gas canisters?

[@bramvanduijn8086]

​@@SchiwiM Interesting idea. It would require solid river banks, otherwise the river would just create a new path. Solid river banks increase flood risk from high water coming from upriver, since there is no absorbant overflow space. Though that is only true far downriver, and near the ocean a local flood doesn't matter as much. It would give fish a passage way, so that is good, but the solid banks would leave little room for other forms of river delta nature.

[@unadomandaperte]

a solid state valve?

[@FranktheDachshund]

A transistor?

[@monad_tcp]

no, this is a liquid state valve

[@daviddroescher]

Solid state fluid diode. To include an equivalent to forward voltage founding electrical diodes. Gas and liquid state matter both behave according to the laws of fluid dynamics

[@timber7744]

I think you'r right. no moving parts. I wonder, if you make a long version, could it blok from 1 side 100%....??

[@daviddroescher]

@@timber7744 I doubt that the law of diminishing returns will allow a 100% stoppage. However just like an electrical diode the flow should be able to be reduced to a value low enouph to sute a spicific purpose. one of the other comments said Tesla used these in place of normal pushrod actuated valves on one of his prototype engines

[@CubedEDM]

I don't know why i watch these but i still do.

[@BestLittleStudio]

Cubed Because they are wonderful, the speaker is articulate and fun to listen to and frankly, you can tell he loves this job.

[@SaebriSelect]

Cubed lol, i watch because i never had an older family members with cool trinkets. this dude is so many peoples grandpa right now

[@ra5071]

Never underestimate the effectiveness of using a pen to point at things... While the glasses rest at the end of the nose

[@bigred675]

Use it as a sound damper. I've done something similar with air compressors messing around. Works kinda like a muffler.

[@StormadoMan]

Wonderful, thanks Tim!

[@channelfadge7438]

you could smoke out of that metal one

[@aaronmackay6123]

also that would be a funny prank. the unpuffable pipe one way but works great the other way.

[@0x73V14]

a pipe that your buddies can't cough and spray your weed all over

[@hasanbaidoun9154]

Great! This can also be used in designing the next generation sound isolation, since it can be used to dissipate the sound wave

[@spambot7110]

wut

[@daviddroescher]

Absolutely use openings at specific size corresponding to wavelength of undesired sounds and harmonics thereof

[@getaclassphys]

What are two times for full balloon deflation in opposite directions for this valve?

[@iwbmo]

i dont think anybody understands the question

[@aaronmoore2691]

Reworded: How long will each side take to fully deflate a balloon?

[@user-yr4lq5ov8g]

@@aaronmoore2691 how'd you even understand that?

[@aaronmoore2691]

@@user-yr4lq5ov8g I'm a southern american, proficient in boomhauer.

[@Stefan_Dahn]

38

[@newjargon1697]

I think a lot of people forget that air is a fluid. Thank you for the video.

[@fjb4932]

But Not vice versa ( fluid/air, not people ) ...

[@shibamashups]

Has science gone too far?

[@waffl3sk4t]

Peter Walker since 1920 you mean?

[@jren207]

One weird trick discovered by an old man. Balloon makers hate him!

[@Jeyricho]

Peter Walker 10 LITERALLY MIND-BLOWING WAYS TO MAKE AIR SLOWER THAT YOU'LL NEVER BELIEVE

[@Monstufpud]

Peter Walker 93% of people fail this test

[@aurelia65536]

WAKE UP SHEEPLE!

[@bluesand1932]

This could be elaborated by milling four quadrant sections and assembling as a cylinder within an adjustable sleeve. By porting each "J" section it seems like a very efficient variable hydraulic shock absorber core could be designed as someone mentioned or a pressure spring retained regulator valve (ie steam) which would open more relief ports as the increased pressure causes the core to slide further out of the sleeve. The valve itself would become the moving part so no claim to 'no moving parts' i guess.

[@donktheclown]

Awesome, thank you. Would it be possible to place colored filaments at key junctures so the actual currents could be visualized? I would love to see how it flows. Thanks again.

[@1ofsolitude]

Tesla valves are super cool

[@mightyfinejonboy]

Like a sort of labyrinth seal? would make an interesting valve for a an adjustable shock absorber?

[@spacewarpphotography1667]

I don't know if Tesla is credited or even responsible for this application, but this type of valve is used frequently in water pipes, to prevent sudden pressure surges which could damage the system.

[@ObiWanBillKenobi]

The scientific explanation of this is that there is much more turbulence in one direction. Turbulent flow is much slower than laminar. The quicker direction has much more laminar flow. See Bernoulli’s Equation.

[@childofthe60s100]

THAT is what he said - so that EVERYBODY could understand it!

[@handleismyhandle]

Can't help but wonder if you could use this in conjunction with a water tank and copper coil to make a very simple flash boiler. Guess I will have to use a dremel on an aluminum block and find out eventually.

[@tristanriggi3862]

beautiful design and the uniqueness in the artitecture ++

[@Rheologist]

Maybe you could watch some colored water flow through! Please do this on camera!

[@CriticalEatsJapan]

So was it ever used for anything?

[@CriticalEatsJapan]

***** Yeah ---it was never really used, but it is still cool

[@pavlestajdohar4377]

+Critical Eats Japan It probably wasn't used for anything so far, and I think I know why. Although the idea is quite simple - let the fluid itself do the job by its own flow - nobody really believes this can work in reality as the valve seems somehow "open" both ways. And even those who believe it and are ready to try it sooner or later come to the conclusion that the valves that needn't repairs and replacements are not attractive neither for the valve producers nor for those who do the repairs. You do it or sell it once and then you're out of business.

[@vengefulenigma]

also it can't completely block the flow, just significantly reduce it, which isn't always useful

[@GAAAANS]

I would guess that this type of valve needs maintenance and repairs as well. Just by the looks of it the longer it is in use the more worn out it will get and with that at some point in time just wont offer enough resistance to the fluid. And while normal one way valves can just get exchanged because they are very cheap I guess repairing this thing would just be a lot more expensive. Then there is also the size, to be of good use in the Industry you would need to Upscale this concept so that they fit with DN 15 DN20 or even Bigger Pipe diameters. These would get huge, while a normal one way valve is normaly not bigger than you hand.

[@justinrobinson692]

Its been used for pulse jets which are used for many purposes

[@BenderOfMusic]

I had never seen this before :o What a smart man that Nikola Tesla was :) I wish we had more people like him around :)

[@RFC3514]

Michel Lavergne You've never seen this before because it's basically useless. It takes up a lot of space, is expensive to manufacture, doesn't allow any real-time adjustments, can't really _block_ reverse flow, etc.. It's an interesting toy to demonstrate some physical principles, but there are very few places where this kind of valve would even perform _acceptably_, let alone better than other types.

[@BenderOfMusic]

RFC3514 Of course You are right :) Check valves are much simpler and work better :) But it is still very interesting :) I hope he did not waste any money on a patent on it .

[@JakeBass666]

I'd bet that if you fractalized it off the other side at each junction (half size loops alternating), like a tree, you could get the blocked output even closer to zero. Pretty cool.

[@anderskarlsson6045]

Since the effect seems to be dependent on the flow rate I guess I could be used to even out intermittent or pulsing flows.

[@Onkarr]

Long Live Nikola

[@DuKUaD45]

He is already dead :D

[@robertrobinson3861]

Some people are comparing this to a labyrinth seal. I think they are missing the point of this device. Labyrinth seals work the same way in both directions. They are not one way valves as such. They are just a form of restriction to limit flow or leakage. This is a one way valve with no moving parts.

[@monsieur_doggo3030]

I dunno why but i cant stop wathcing thes videos :P

[@Marvin_McFly]

Creating Eddie currents to slow/disrupt gas flow in a particular direction, the exact same principal as a rifle suppressor.

[@SlobbyHill]

Well now I know what Tim smokes his weed out of.

[@PiotrMagpie]

some shock absorbers using this tech

[@slothchunktakingcareofyour323]

no ned for that, they already have a washer over some holes that clogs em on one way and the same holes push the washer away on the other way, freeing themseves... but not a terrible idea

[@DaSquareful]

@Chris Russell i love that. Its so smart and sciencey and genius in how particular but simple the design is.

[@revimfadli4666]

@Heads Mess surprised why this kind of fluidics isn't more common. Then again, they're probably a pain to calculate & model

[@revimfadli4666]

@Heads Mess when did I say that building things is impossible without modeling & calculation? When did I say that intuition isn't enought to build them? It's about optimization, sure one can whip prototypes in their garage based on intuition alone, but what about mass-production companies figuring if it's optimizable enough to replace/compete against existing alternatives? Or if it can be made as effective & efficient as feasible? "Landing on the moon before your modelled rendering ever existed" What's "my rendered modelling" btw? How did I own it? "People design things, not computers" That's why I said 'pain,' computers don't feel it either, they just help human designers. But when did I say it had to be computed? Anyway, when did I say it had to be rendered? Good that you brought the moon landing example, didn't they still use calculations to work on it(though with slide rulers & such, but still calculations)? Granted, it's now possible to quickly fabricate prototypes, but wouldn't calculations help accelerating the process & reduce R&D costs? And wouldn't statistics help figuring where to go from the current batch of prototypes?

[@revimfadli4666]

@Heads Mess "why spend three years figuring out how to simulate it" Who would take that long to model & simulate nowadays? "Wack one together in a few hours and see how it goes in real time" Would it really take that short to suddenly arrive at an optimal product & be so sure about it? What if it doesn't perform well, or even work at all? What if you need to iterate lots of prototypes, making those "few hours" sum into longer than modeling & simulation, while adding material & fabrication costs? "If you don't attempt to design things, your fluid dynamic simulations mean nothing" When did I say that simulating must equal not attempting to design? What if I meant designing intuitively first and then optimize to arrive at a competitive product? What if there was no attempt to optimize, would those prototypes mean nothing?

[@georgekurgansky5986]

Nice to see it with air!

[@bjl1000]

How about using it to replace piston rings in internal combustion engines? No friction, no leak.

[@RaExpIn]

A really interesting piece! Such a simple construction with such a good effect! :)

[@RFC-3514]

Completely useless, though. It doesn't do anything that can't be done more efficiently with other designs.

[@ufoengines]

I ran across this old digital computer patent 3190554 where it operated on compressed air instead of electricity. Was one ever built and use for anything? Could one be built today by a 3D printer? If Babbage had gone with compressed air do you think his Difference Engine could have been built by the folks who built pipe organs?

[@carlosdelossantos5115]

And today is Tesla's birthday

[@Beobout6]

I wonder if a longer Tesla valve would change any pressure measurements.

[@alphabeets]

I agree, this really is quite astonishing.

[@Chr.U.Cas1622]

👍👌👏 Simply fantastic!

[@MateusHokari]

You should try and plug another balloon on the other end, to help visualize the flow rate

[@Goldsrevenge]

Extraordinary

[@bananapete]

Would be nice if there were a fan, water to bubble through, or another balloon at the other end to show the air flow. Is the air pressure at the exit the same in both directions? How does it handle high pressures, more resistance or less? Does it get hot? So many questions.

[@mahirbalushi3953]

Thanks

[@AdaManfaat]

anyone has good drawing of tesla valve? kindly share please. I want to cut one.

[@suzesiviter6083]

Excellent demonstration, now it needs someone to model it vs. different air pressures for practical applications and tune the flight angles that produce the individual back pressures. I would love funding for this if anyone is interested. You could even use actuators to guild the air path to tune it to any desired back pressure, I bet multi-stage units could create replicate existing one-way valves based on a constant input pressure.

[@RFC-3514]

It's been around for over 100 years, you think it still "needs someone to model it"? Sigh...

[@Mentorcase]

They have this setup in some exhaust systems, it's called anti- reversion.

[@NormanMatchem]

+Mentorcase You know that the muffler copies the construction of the silencer? Or the 'suppressor' as more people are calling it nowadays? I was just thinking that this tube could be a sort of over-engineered way of making a firearm select fire for automatic or manually operated. Rotating it one way will have gasses from a port in the barrel QUICKY head back towards the action, cycling it to allow for further firing, or if you flip this huge blocky thing around, the expanding gases are slowed to the point where the action cannot cycle, effectively making it a manually operated firearm.

[@TIMEtoRIDE900]

+NormanMatchem Geez - - why not just have a vent ??

[@slaboide5214]

Tesla made so many genius things yet he died in povetry ;(

[@m.b.82]

True geniuses usually think about more interesting thimgs than money.

[@slaboide5214]

@@m.b.82 yeah but USA did him dirty. They stole his inventions

[@m.b.82]

@@slaboide5214 yeah, and Edison was a bit underhanded and more business savvy too, which didn't help.

[@slaboide5214]

@@m.b.82 and also idk if many people know this, Tesla wanted electricity to be free but of course they had to be capitalists and not make it free...

[@thedistractedcanadian4355]

Let’s not forget he thought he could blow the world in half with perfectly placed and timed explosions or the building he “shook” apart with his osculating machine

[@catmandont100]

You may find an Electrical charge can be generated, with dissimilar metals, as mounting plate.

[@coltenmeyer2775]

Tim your such a great orator you keep people intriqued with some simple little gadgets keep up the work buddy we love what you do n i know weve only just begun to scratch the service of that giant collection.. Maybe a novelty pipes video? Or tobacco related stuff other than lighters cause you got that covered heh! (:

[@IntiArtDesigns]

TESLA!! \m/ *salutes* "Hail to his glory!"

[@Barskor1]

Now take this in a CAD system so that you quadruple the number of channels per length and use a laser sintering process to form it.

[@q.e.d.9112]

I’m wondering if this valve could be “tuned” to be most effective at a given pulsed frequency.

[@JGHFunRun]

Probably not, but maybe

[@q.e.d.9112]

@sajber kurajber No, you misunderstand. I’m talking purely about it having a natural resonant frequency. No electrics involved.

[@Amin10XD]

Here from Lesics>>> ❤❤❤

[@Spherey]

"This is a tesla valve, *_a very strange creature_* "

[@THICCTHICCTHICC]

Thank you Elon

[@simpleman8883]

Thank you

[@jonahansen]

Couldn't one combine an array of Tesla valves and a turbine to harness ocean waves to produce electricity? Seems to me I heard one of the problems in harnessing ocean waves is the intermittent reversal of the water flow; Tesla valves could be used directly to turn the turbine, or to push water up a gradient into a reservoir which then could flow relatively constantly down through a turbine, no?

[@Xalzia]

so basically like a resistor but with airflow?

[@bunescudesign3923]

Is there a one-way tesla valve that completely blocks the flow in one direction?

[@CrazedArranger]

Cool! And sometimes it rains outside!

[@geoffreycasey875]

What situation would it be used?

[@jeffmillett7332]

So if a balloon was placed on each end, would one inflate the other?

[@aknaana1659]

Yes

[@XE-ii8sc]

+Jeff Millett If both balloons were equally inflated, nothing would happen. The only difference would be the time it took for an inflated balloon to fill the empty one. In one direction the balloons would equalize slowly. In the other direction, it would happen faster. But no matter which way you spin it, the balloons will always end up at the same pressure.

[@brenkrasmer]

+4X4 E30 Actually? funny thing about balloons like in the video, the less inflated balloon would inflate the more inflated balloon, because the walls of such balloons actually put less pressure on the air inside them the more stretched out they are. You can even see it with only one balloon. Fill it up, and when you release the air, you can hear the pitch and noise of the escaping air rise near the end of the deflation. There are several videos out there proving just that, but, yeah, it would equalize the pressure overall.

[@XE-ii8sc]

Bren Krasmer Wow that's pretty cool. It makes sense though if you think about when you're trying to blow up a balloon, at first it's a really hard to blow into it, but once it stretches past a certain point blowing into it becomes a lot easier.

[@IvanEedle]

Hooke's Law, baby!

[@Vicvines]

all is well in the world for 2:25

[@AntifoulAwl]

I think my wife has one of these installed in her purse. Money flows only one way in that thing.

[@lapatjani3171]

Antifoul Awl So she either gets money but never spends it, or spend it but never gets any. I can't see the problem here.

[@neweraccount5615]

Antifoul Awl why would you choose that for a mate?

[@neweraccount5615]

Michael Persico so you usually just type it to please others? To encourage them to carry on with something that couldn’t make even yourself laugh? People pleasers are worse than cold coffee and America has No reasonable use.... take a hike

[@spambot7110]

have you considered discussing relationship issues with your spouse rather than making jokes about it on the internet? you do know that people are supposed to actually like each other in a marriage right?

[@TScott-fb1oc]

@@spambot7110 Thanks. I come to youtube to receive relationship advice from strangers.

[@davidbeddoe6670]

Its the same thing as an airlock for wine-making, but longer with more convolutions and no fluid in the dips.

[@sigvardbjorkman]

Does it have to go straight or could it curve?

[@spugintrntl]

I wonder, would it work the same way in a hydraulic circuit or does it only work with air?

[@CryptoidEngine]

This is absolutely amazing. If this is so simple, why isn't it used? I mean, I understand it's not a TOTAL cutoff, but even with that said... :/

[@__shifty]

because when under pressures greater than what a balloon can puff, the valve offers almost NO measurable difference in fluid motion in the "slow" direction, but still makes more resistance in the "fast" direction than a simple check valve. the idea was to remove moving parts and thus fail pionts. tesla is a genius, but this one just didnt hit the mark. - master plumber

[@RFC-3514]

Because it doesn't do anything that can't be doen better by simpler and more compact designs.

[@RFC-3514]

@@__shifty - Tesla was mostly a hack. He was great at designing generators and very little else. Half his "inventions" never worked and were physically impossible, he just lied to get funding (and he famously said it was impossible to send electrical signals through the air).

[@Dazlidorne]

What is the practical use of this?

[@kylejgrant]

It starts with the 3 time lord space lizards, then its turtles all the way down.

[@believeme5903]

So how does work to pump water up from a the bottom of a well??

[@mandolinic]

Obvious application for this is draught proof air inlets for gas fires, etc. If you install a gas fire then (unless it's got a balanced flue) you've got to cut a 4" hole in the wall to let in sufficient air to feed the fire. Trouble is, any wind outside and you get a cold draught coming in. Enter the Tesla valve. Put a Tesla valve in the hole so that air can only travel slowly through it. You'll still get enough air to feed the fire, but any cold draughts are blocked. No moving parts, so nothing to go wrong.

[@najeyrifai1134]

+Mandolinic I love it when people think for themselves. Are you an engineer?

[@mandolinic]

Najey Rifai I used to be a software engineer!

[@johnstatser7088]

+Mandolinic I dunno, seems that the way this slows fluid down is by limiting volume as well. A larger valve would also increase speed. A large enough baffled, zig-zag, inlet can slow flow without affecting volume too much, as can duct work with a few sharp bends. And, surprisingly, a larger outlet on the inlet can let in a comparatively larger amount at a slower ( less drafty) rate than a smaller one. I'm pretty sure this is somebody's law. You go to messing with any one of rate, volume, and pressure, and you affect the others. make one go down the others go up or down. It's complicated, might take more than one somebody to make enough laws.

[@mandolinic]

Suhkma Dheek Fair comment.

[@welders485]

Mandolinic I think your "draft" is actually an air pressure burst, not a back pressure burst . In otherwords, its like rolling the window down in your car and all the pressure is sucked out of you car and your ears. Same happens to your furnace , its a large gust of wind passing your house that sucks the pressure out through your pipes. I think the best way to combat this would be to have a fan in your pipe with a flywheel attached to keep the exhaust flowing at a constant speed and not being affected by a fluctuation in air pressure.

[@omesie]

If you put a balloon at each end, would it fill one and empty the other?

[@spearshaker7974]

Funny how a teardrop shape controls fluid dynamics.

[@radiojet1429]

Tim could read a telephone book out loud and I would listen.

[@robertdeal410]

Great vid. Thank you.

[@joshuacornell6667]

In one end the water of the nile moves SLOWLY but if you were to pour it into the other end then it flows like a RAGING RAPID River.

[@MaxMyrmyr]

theoretically it can be used as an oil damper or strut

[@nicholascremato]

It was a solution for the poor water pump valve of the day!

[@prassanna369]

How does a tesla valve react to an input like electromagnetic wave? Does the wave behave same as fluid? Assuming that the fundamental mode of the tesla valve is same as the input electromagnetic wave!

[@frtard]

This seems like it would be the ideal for valves in valved pulse jet engines - no moving parts to wear out... I wish I wasn't so lazy.

[@JGHFunRun]

Really cool thing

[@henrywoods52]

What can we use it for?

[@vyshnavshabunair8358]

He should've put a balloon on each side and demonstrated what would happen in that scenerio too.

[@LordMayorOfDairyBell]

Simply, they would equal out. Assuming a perfect seal, the balloons would only change until equal pressure is achieved.

[@kwlweapons]

Do you have the 3d design or blueprint for the one way valvee?