Can you repack a trv insert?

[D4dog]

I have a leaking caleffi trv, around the actuator pin. I have a couple of old valves, which were not leaking, and inserts came out without any problem.
I cannot source new inserts from caleffi in uk (why not is a good question) and freezing pipe is diificult. Draing gravity fed system very long winded due to heat store and solid fuel gravity fed range...so insert replacement quickest option.

Any reason why I shoulnt use an old but sound second hand insert?

Alternative is to repack the trv in situ...any reason why this could not be done? And what would it be packed with...ptfe and some form of grease?

Any pointers appreciated.

D4.

 

[BlueLoo]

Use Tank bungs and a wet vac.

 

[BlueLoo]

https://www.toolstation.com/radiator-valve-change-kit/p31768

 

[gas112]

be brave snatch it live

 

[D4dog]

Might work..there is only one vent on the heat store, and i can isolate the header tank supply to the heat store. . Had considered the insert replacement tool...excelkent idea but not at that price.

Out of interest, took the trv insert apart..simple spring holding thr valve open, but no identifiable sealing mechanism for the pin. Guess the plastic valve top acts as the gland...which means failure inevitable at some stage.

Will replace the entire valve...goinfg to use Danfoss, becuase I can get replacement inserts...and the tool to swap them out!

 

[BlueLoo]

An old trick to bung up the tank outlet is a potato.....

 

[D4dog]

Thanks for all replies. Job turned into a disaster...decided to change valve in entirety, olive puller got stuck with olive on very end of pipe...which then twisted as I applied too much torque.

However, i did discover after the event that you can get a replacement caleffi spindle seal (The top plastic nut which holds the valve spring in place).

Replacement internal valve assembly fits radiator valves. | Caleffi S.p.a.

www.caleffi.com

Available from Altecnic in Stafford. Having removed and dismantledv the valve, it is clear that these can be replaced without freezing or draing the system...the amount of water released is no greated than the leak around the spindle. MASSIVE time safer!

Ps..you cannot vacuum seal a 1500l heat store. Tried, but it became clear the tank was likely to implode! So managed to freeze the pipe just long enough to cock the job up!