Crazy passive thermoelectrically powered gas safety valve: simple analog elegance!

Here we look at the ubiquitous gas valve found in stoves, barbeques, grills, heaters etc. that takes advantage of the thermoelectric effect (Seebeck effect). Instead of using a complicated system of sensors and microcontrollers, this valve and thermocouple package provide robust burner blowout protection with the simplicity of a copper tube. The K-type thermocouple tip when heated, provides 50mV to power a magnetic latch, that keeps gas flowing once the burner has successfully been lit. This tiny device manages to produce around a 1/4W of power, enough to hold the gas valve open. The moment the burner is blown out and it cools, the valve closes under spring tension, stopping gas flow. This integrated solution is as simple as it is elegant, and provides cheap but efficient safety for such a critical application.

[@dirkvanschalkwyk1919]

On flame out, the expanding gas that still flows assists in the cooling of the thermocouple, causing the millivolts to drop away to deenergise the coil, releasing the spring loaded valve plunger to shut off the gas flow. So neat and clever.

[@RealtorParisa]

This was very well explained and saved us time and money. We were able to fix our fire pit. THANK YOU.

[@achezzoh]

The first time I bought a cooker with this feature, it really bogged me trying to understand how it works. I even thought I'll need to keep the cooker on electricity for it work, and was even more surprised when it worked without electricity. Super cool, and very creative!

[@byronrace]

Wow. I had no idea that's how these worked. I always assumed they were gas or liquid filled and just replaced the whole assembly including the valve because of that misunderstanding. Thank you.

[@cosmicfugue1226]

Very well explained and very clear video. I searched about the thermocouple as I was curious about its principle and did not know how it works. Now I know what is going on in my home portable gas heater. Thank you 👍

[@khaledisahac]

Thank you for sharing. Very informative

[@dodgydingygames]

this is amazing, couldn't find any other videos on this and you explain it so well

[@stephenhicks826]

Thanks for this, I'm troubleshooting this very problem on a stove and this has solved the problem. Good electrical connections are essential.

[@rico2207]

Excellent..thanks

[@RandomNullpointer]

very well explained. thank you. it would've also been super cool if you showed a measurement of the voltage at the terminal while heating/cooling the tip.

[@olegbesperstov7074]

Thanks mate for explaining how this device works - no more magic!

[@cooltraz2966]

Good explanation man

[@manuelcuri8173]

Great video! It helped a lot to understand why my pizza oven is not starting properly.

[@darrenholt4530]

Thank you for posting, a very clear, well explained and demonstrated video

[@dimuthuruwan8890]

Your explanation is excellent, I have learned a lot from this, thank you very much❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤

[@mohammedabdulhakabdullaabd1121]

Very good info. Thanks

[@BELINC7]

Good job

[@jimmyromanous3674]

well done , THANK YOU 🙏

[@freightuk]

Thank you for that excellent explanation, at least I know that my kitchen gas hob will still work in the event of a power cut as this system is totally self contained to each burner. As a side note I have found that the thermocouple protecting the small hob burner needs cleaning fairly often as it can be rendered inoperative by even a thin layer of carbon dust acting as an insulator. Wow, I have learnt two useful things this week. :)

[@vijendran20]

Wow… Very well explained. Thanks for your efforts to explain.

[@mdhasibulhasanshanto9821]

Thank you sir

[@agussetiono6010]

Excellent, good knowledge

[@ahmedabdulatif9768]

Very will explained 👍🏼

[@SwordOfUltimate]

Amazing job, very well explained, thanks a lot

[@GadgetEngineering]

Glad somebody enjoyed the video, this one is my least watched one basically, but a cool concept I thought!

[@aloiswangui9388]

you are amazing

[@LucaNatale]

Perfect demonstration! Is there a reason how some stovetops instantly close the gas stove when you put the handle in the 0/initial position? I don't get how they manage to instantly close the valve without waiting for the cooloff delay.

[@brikoplanet]

👍👍👍👍👍

[@greggk47]

Are the coils a standard diameter or specific to the valve body? Do the coils require different MV to activate?

[@cklmathew]

Where can I buy those?

[@naeemullah6610]

Hi.sir when I remove hand from key .oven burner safty is off. What. S

[@tharangasampath1009]

I have to ausk many thinks about gase burner.

[@abbaskhan-dg5fy]

Is it use for home gass pipeline

[@docesam]

but if my brick oven is very hot ( 1000 F) the safety valve will still shut off despite the high temp?

[@ErCanEverything]

👍👍👍🤝🤝🤝🙂

[@scottsaree4295]

when press valve but no gas flow what wrong and how to make gas flow?

[@BellissimoiSoborg]

where is the Igniter ?

[@RandomNullpointer]

any idea how i can increase the sensitivity of this device? my stove takes a long time before it latches open.

[@freightuk]

Try cleaning the thermocouple tip and post gently with either wire wool or a fine stainless metal pan cleaner to remove any carbon deposits, it fixed my small gas hob burner that has been bugging me for weeks, saw that tip on another KZbin video. :)

[@rotten-Z]

Thanks for explanation! I think that when the system is installed correctly, in the event of an abnormal burner extinguishment, it works quite quickly, because the gas continues to blow over the sensor and it cools faster than in this demonstration.