What's inside a Thermal Expansion Valve TXV - how it works hvac
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Date: 2023-11-17
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Comments and reviews: 25
sandspar
Thank you. Most explanations of the TXV usually omit the cartridge that the diaphragm pin pushes down on, and the subsequent conical orifice that allows the change in refrigerant state to occur. I remain puzzled as to where the heat of the incoming refrigerant is dissipated and escapes to, as the brass body of the valve does not seem large enough to disseminate the heat. It obviously does, and is of optimum design, but it just does not seem to be enough mass to transfer the heat to the air. Thank you, a nice demonstration.
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Thank you. Most explanations of the TXV usually omit the cartridge that the diaphragm pin pushes down on, and the subsequent conical orifice that allows the change in refrigerant state to occur. I remain puzzled as to where the heat of the incoming refrigerant is dissipated and escapes to, as the brass body of the valve does not seem large enough to disseminate the heat. It obviously does, and is of optimum design, but it just does not seem to be enough mass to transfer the heat to the air. Thank you, a nice demonstration.
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pepethebull1
ok very cool vid but I have a question in minute 4: 16 you explain that the pin gets push by high pressure saturated liquid pushing the diaphragm up that pushes refrigerant to the sensing bulb and back and fort depending on the temp that you get from the evaporation coil so this refrigerant is never gets passed the diaphragm down to the pin? its only in the sensing bulb and capillary tubing and on top of the diaphragm?
its independent from the refrigerant running in the lines right?
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ok very cool vid but I have a question in minute 4: 16 you explain that the pin gets push by high pressure saturated liquid pushing the diaphragm up that pushes refrigerant to the sensing bulb and back and fort depending on the temp that you get from the evaporation coil so this refrigerant is never gets passed the diaphragm down to the pin? its only in the sensing bulb and capillary tubing and on top of the diaphragm?
its independent from the refrigerant running in the lines right?
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PEARLoftheEast
I remember the time during my apprenticeship our chef technician can not answer correctly of my question about what is the used of the sensing valve Im not satisfied with his answer what I did was I bought expansion valve and I cut it in a lengthwise just to understand how it works just like you did lol. that was my unforgettable moment of being a refrigeration/airconditioning technician
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I remember the time during my apprenticeship our chef technician can not answer correctly of my question about what is the used of the sensing valve Im not satisfied with his answer what I did was I bought expansion valve and I cut it in a lengthwise just to understand how it works just like you did lol. that was my unforgettable moment of being a refrigeration/airconditioning technician
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Len
The last ac tech that came to my house to service the unit moved the sensing bulb away from the pipe that it was attached to. Do you know why. Do you think the TXV is not working properly? Is this ok? Or should I put it back where it was? About how much does it cost to replace the TXV? Thank you so much.
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The last ac tech that came to my house to service the unit moved the sensing bulb away from the pipe that it was attached to. Do you know why. Do you think the TXV is not working properly? Is this ok? Or should I put it back where it was? About how much does it cost to replace the TXV? Thank you so much.
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Jacques
Im always amazed at how creative these little engineering solutions are. Using the state of the superheated fluid to regulate the thermal expansion valve is actually a stroke of brilliance, its always incredible to see the ingenuity that went into designing the most obvious things.
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Im always amazed at how creative these little engineering solutions are. Using the state of the superheated fluid to regulate the thermal expansion valve is actually a stroke of brilliance, its always incredible to see the ingenuity that went into designing the most obvious things.
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Leila
the main function of txv is to convrrt liquid phase to gaseous phase and to reduce temp to absorv surrounding heat outside the tubes. This is a application of Boyles Law, the txv is designef to automatically regulate the flow of fluid. Eduardo here.
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the main function of txv is to convrrt liquid phase to gaseous phase and to reduce temp to absorv surrounding heat outside the tubes. This is a application of Boyles Law, the txv is designef to automatically regulate the flow of fluid. Eduardo here.
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welcom
Sir hi plz ihave big problem ichange expansions valve for air-conditioning Skm in indoore unyte evaporateur to mucht voice noisy 4 luiquid gaz insupportable. this ac 48000bth. Waht iwill do now its harde for welding cappilary. Im tired
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Sir hi plz ihave big problem ichange expansions valve for air-conditioning Skm in indoore unyte evaporateur to mucht voice noisy 4 luiquid gaz insupportable. this ac 48000bth. Waht iwill do now its harde for welding cappilary. Im tired
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mrmrodonnell
These videos are as good as it gets but just in case no ones pointed it out, it says whats inside a filter dryer a few mins in - that said your videos are great. If you can idiot proof them even more for me Id love it. Cheers
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These videos are as good as it gets but just in case no ones pointed it out, it says whats inside a filter dryer a few mins in - that said your videos are great. If you can idiot proof them even more for me Id love it. Cheers
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anjaan
Hello
Sir I'm fresher mechanical engineer, how to know fully knowledge in hvac, plz guide me sir
i given interview for gulf but not selected, plz help me
my dream is work in America, how is possible i work in America.
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Hello
Sir I'm fresher mechanical engineer, how to know fully knowledge in hvac, plz guide me sir
i given interview for gulf but not selected, plz help me
my dream is work in America, how is possible i work in America.
reply
JustbeingMe
Mind blown. Been in an apartment maintenance tech for almost a year and I'm just realizing the original installers never tied the bulb on the other side of the coils. Makes so much sense now. Thank you for this video
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Mind blown. Been in an apartment maintenance tech for almost a year and I'm just realizing the original installers never tied the bulb on the other side of the coils. Makes so much sense now. Thank you for this video
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bonface
Once am back on my feet working again, I will surely buy you a cup of coffee Paul, I really love your hard work and thorough step by step guide into a mechanical system, I would love if you work through more systems.
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Once am back on my feet working again, I will surely buy you a cup of coffee Paul, I really love your hard work and thorough step by step guide into a mechanical system, I would love if you work through more systems.
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Jose
6: 13, it is the opposite: as the cooling load increases the superheated decreasese right?
PD: in 6: 32 they say the opposite.
Nice video that contradicts itself: (
Someone tell me pls if I am wrong: )
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6: 13, it is the opposite: as the cooling load increases the superheated decreasese right?
PD: in 6: 32 they say the opposite.
Nice video that contradicts itself: (
Someone tell me pls if I am wrong: )
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Laxaree
Thank you so so much! This video made me learn and understand the concept as clear as crystal. Thank you for the patient, accurate and graphical explanation it was very informative!
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Thank you so so much! This video made me learn and understand the concept as clear as crystal. Thank you for the patient, accurate and graphical explanation it was very informative!
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Life's
Thanks for amazing knowledge. So i saw a small tube from expansion valve into the end evaporator (behind sensing bulb) but i dont know what is that? Can u explain for me, please!
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Thanks for amazing knowledge. So i saw a small tube from expansion valve into the end evaporator (behind sensing bulb) but i dont know what is that? Can u explain for me, please!
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ChefHomesteadMaker
What are the symptoms if something is wrong with the expansion valve? If ice forms on the evaporator coils, can I fix it by reducing the flow of refrigerant?
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What are the symptoms if something is wrong with the expansion valve? If ice forms on the evaporator coils, can I fix it by reducing the flow of refrigerant?
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Ron
Parker, Thermostatic TXV R-410A TX5N4.
Indoor Coil: Vertical CAPF4961C Does this install OUTSIDE of the case? Looks like it does do you know if it does or not? Thanks
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Parker, Thermostatic TXV R-410A TX5N4.
Indoor Coil: Vertical CAPF4961C Does this install OUTSIDE of the case? Looks like it does do you know if it does or not? Thanks
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change
The key component to your video was Doing the cut away on the valve. It gave me a clear understanding on how the TX valve operates. Good job. Thank you.
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The key component to your video was Doing the cut away on the valve. It gave me a clear understanding on how the TX valve operates. Good job. Thank you.
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Angshuman
If there is no air flow across the evaporator and superheat level is not reached, does the txv stay closed and not let any refrigerant to flow?
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If there is no air flow across the evaporator and superheat level is not reached, does the txv stay closed and not let any refrigerant to flow?
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Webel
Completely awesome! This is as good as instructional videos get (and I even make them myself. Thx, Dr Darren Kelly, Webel IT Australia
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Completely awesome! This is as good as instructional videos get (and I even make them myself. Thx, Dr Darren Kelly, Webel IT Australia
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Christian
Really great videos. Im from a domestic background now supervising comercial fit outs.
Your videos are invaluable.
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Really great videos. Im from a domestic background now supervising comercial fit outs.
Your videos are invaluable.
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Damon
I find your videos very useful and informative. Do you have a video discussing Direct Expansion (DX) Systems?
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I find your videos very useful and informative. Do you have a video discussing Direct Expansion (DX) Systems?
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RAJEEV
finally watched this guys face,
fyi: I've been watching his recent videos were he doesn't show his face
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finally watched this guys face,
fyi: I've been watching his recent videos were he doesn't show his face
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Art
Will you replace a broken TXV or replace the whole HVAC? The former is about $2000. The latter is about $4000.
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Will you replace a broken TXV or replace the whole HVAC? The former is about $2000. The latter is about $4000.
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Anna
I just did a lab on this, and I didn't get it until this video. Thanks for the clear and concise explanation!
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I just did a lab on this, and I didn't get it until this video. Thanks for the clear and concise explanation!
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BrAndy
But I don't understand why does passing the liquid through the small orifice makes the temperature drop
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But I don't understand why does passing the liquid through the small orifice makes the temperature drop
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