22 compression fitting on 3/4 pipe.

[Vladimir]

Greetings fellow do-gooders!

I have searched for the answer to this before i posted and could not find the answer so mods please be gentle with me.

I am putting new heating controls in an existing system. The existing pipework is 3/4 inch. The new motorised valve that I am installing has 22mm connections.

Can I connect the 3/4 pipe to the 22mm fitting on the valve if I use a 3/4 inch olive or what is the best way to approach this?

Many Thanks in advance...

V

 

[tomy]

In a word yes , just replace the 22mm olives with 3/4 olives and bobs your uncle .

 

[supermario]

I once got caught out not noticing pipe was 3/4" not 22mm just reconnecting install at 17.30 on a saturday (not all of us play golf) didnt have any 3/4" olives or reducers on board. result: red faced plumber!!!! Unhappy punter and mad ring round pals. Hot water wasnt restored until 20.45 and my other half sulked allday sunday about missing sat night out.
ALWAYS carry everything!

 

[namsag]

22MM copper olives work just as well. No need to bother with 3/4 olives

 

[kevplumb]

then you need to hawk them up wiv trevs 18"" stillsons

 

[supermario]

only had osma gold 22 fittings on me. never repeated that mistake

 

[kevplumb]

if you can't get 22mm compression to bite on 3/4"" your in the wrong job

 

[supermario]

osmagold= pushfit

 

[kevplumb]

dont use the cack
so wouldnt know

 

[padijeff]

Hi, put compression on 3/4 pipes and still loose onto 22mm pipes to feed taps etc?Wont tighten!

 

[Deleted member 105431]

Use a rothenberger pipe expander to enlarge the pipe slightly and 22mm olives will work.

 

[sambotc]

Tighten them up then undo again and wrap a little ptfe tape around the olive and retighten. Works for me (on several occasions)

 

[kirkgas]

i prefer to use 3/4" x 22mm yorkshire straight couplings on the old pipe

 

[padijeff]

Hi thanks for your recent advice! However, ive now got another problem! Gate water valve for the cold mains is stuck shut!
What can I do?

 

[Nige F]

turn off main in footpath outside of house boundary near road.. replace valve in house with a stopcock.