Heat Pump 07 TXV & Check Valve

In this video we cover how the TXV bypasses in the heat pump cycle.
We cover internal and external check valves plus the bi-flow Txv that meters in either direction.
Special thanks to JD Kelly @ Student_of_HVAC for these graphics!
We do not cover how the normal operation of the TXV as that has been discussed previously here:
HVAC 060 Introduction to TXV
• HVAC 060 Introduction ...
HVAC 090 deeper view of the txv
• HVAC 090 TXV a deeper ...
Many more TXV resources here!
Sporlan Training online sporlantraining.com/?lang=en_us
Danfoss TXV training online
www.danfoss.com/en-us/product...
Emerson TXV
climate.emerson.com/en-us/sho...
HVAC school TXV content
hvacrschool.com/?s=TXV
AC Service tech, Craig has a ton of great TXV content and videos
www.acservicetech.com/search-...
Engineering mindset TXV are great
theengineeringmindset.com/ins...
Engineering mindset TXV video
• How TXV works - Thermo...
Engineering mindset TXV inside Video
• What's inside a Therma...
HVACR Videos TXV
• DON'T ADJUST A TXV WIT...
HVACR videos he has so many great TXV diagnostics videos
• Vapor and TXV's dont w...
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Heat pumps typically have 2 metering devices but only 1 is used at a time.
in this video we discuss how TXV bypass when not in use. we also discuss how a single TXV can be used to meter in either direction.
Thermostatic Expansion Valve tires to control Superheat and work very well in Heat Pump operation for air conditioning or heating.

[@6269Josephus_Magnus]

thank you for all of your topic it helps me a lot for I am and HVAC technician here in middle east hoping your topic will continue as what I said thank you very much

[@kennleeds4342]

THANK YOU & JD for the pictures and graphics. It helps out immensely.

[@clintonbrown687]

Awesome video! Thank you so much for the detailed explanation of how these work.

[@AxleHildebrand]

Thank you for posting such detailed information on the topics you cover. 🙂

[@jasonjohnsonHVAC]

Another great video Ty. Thanks for sharing

[@Studentofhvac]

Awesome. Great information!

[@8joh58]

Great video great instructor

[@AngelRodriguez-qg5zq]

3:38 Ty you´re awesome 🤣 Thank you 🙏

[@EverythingHVACR]

Great job Ty! What tiny hands you have 😅

[@love2hvac]

Thanks 😅 it's just a really big valve 😂

[@aljammal9891]

Thank you so much

[@texture6]

How does this apply to NATE Questions.
From the condenser to the liquid line, there should be a liquid seal.
To prevent flash gas and have a proper subcooling at the liquid line.

[@HVACRTECH-83]

Yes on package hps generally it will only be liquid passing through the drier in cooling mode. In heating mode it will be a sat/ flash gas passing through. Always noticed that but never thought too much into it. It's really the only way unless they installed one on each side of the metering device

[@highwind8124]

How would you know whether or not a particular TXV has an internal bypass?

[@caru3257]

How about the package heat pumps with only one TXV? Can anyone guide me on how to troubleshoot them?

[@mikev.1034]

👍👍

[@stephwaylonwells3218]

👍

[@user-id3uy5fh1b]

I have a unit that trips high pressure in heat pump mode like 650 psi but runs perfect in cool mode, could this be the bypass not working on the condenser side, also suction line is 180 degrees so it seems like reversing valve is working

[@love2hvac]

100% absolutely not the reversing valve!
The one of the most misdiagnosed comments. I have gone to countless call where the previous company or tech said it was a bad valve and it was not.
I have replaced very few valves over the years.
#1 you have an airflow problem. The indoor needs more airflow in heating mode than AC mode. Few people know how to actually check airflow.
#2 overcharged. An overcharged system will work in AC but will be a problem in heating.
There are some other other things to look for but those are the main 2

[@JohnJohn-nu8ql]

Do u do live chat?

[@love2hvac]

Sometimes