Single Pipe Heating system problem

[Sfc]

Evening guys, Replaced 2 rads recently on a single pipe system (Heat only Boiler). Both Rads identical Reina Horizontal with trv & lockshield upstairs in the house in opposite rooms.

One of the rads is absolutely fine, The other isn't heating up as i have no flow on the trv side!? Called back for rad not heating up, Bled and Balanced system, Took the radiator off and noticed no flow from trv.

Any help much appreciated before i look into changing valves etc

 

[exedon2]

Standard trv's used?

 

[Sfc]

Standard trv's used?

Yes standard chrome Trv & lockshields used.

Even with system full & heating on taking off the trv completely still no flow. Specific trv needed do you think?

 

[exedon2]

Yep I know standard trv's normally work but strictly speaking should use the ones intended for one pipe Danfoss certainly make one unfortunate bit pricy though.
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Danfoss ra-g thats the one

 

[Sfc]

Yep I know standard trv's normally work but strictly speaking should use the ones intended for one pipe Danfoss certainly make one unfortunate bit pricy though.
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Danfoss ra-g thats the one

that’s great thank you. Instead of forking out for one costly valve, Surely using a lock shield instead of trv will Suffice?

 

[Last Plumber]

The valves should be designed for gravity circulation as the rads are not pumped. See Danfoss, you can buy TRV & LSV on their for the purpose.

 

[Sfc]

Evening guys, Finally got to the bottom of this issue, Has anybody come across this before, Couldn’t believe it today when I went back to investigate and solve the problem. A 15mm end feed tee which had been manufactured like this! 🤦🏻‍♂️

 

[SJB060685]

Evening guys, Finally got to the bottom of this issue, Has anybody come across this before, Couldn’t believe it today when I went back to investigate and solve the problem. A 15mm end feed tee which had been manufactured like this! 🤦🏻‍♂️

I've never seen that before. Probably a Friday batch and no one could be bothered to check.

 

[Last Plumber]

That's one of the reasons you can't learn Plumbing from a book lol.
I bet you never forget that one!

 

[Sfc]

That's one of the reasons you can't learn Plumbing from a book lol.
I bet you never forget that one!

I’m going to be paranoid and checking fittings for the foreseeable. Luckily didn’t cause too much upheaval or take too much investigation but still a drain down and work up etc! One of those things unfortunately!