wiring in a moptorised valve

[janno]

Myson motorised valve wiring; I have just bought a new motorised valve to replace an old one in my CH system. However, the new wiring core colours are different from the old one I am replacing.
Can anyone help to match them up? It is 4-core, orange, blue, grey, brown.
I am planning to cut the original cable and use a junction box as my wiring loom is a bit congested. But, don't know which new to join to which old!
Any ideas???
Cheers
Janno

 

[AndyPRK]

what are the old colours ?

 

[janno]

I knew I should have got all the info before I posted a question!
Will have to give info later as I am not at home at the mo, and need to check spaghetti junction carefully.
I'll reply later.
Thanks
janno

 

[janno]

OK, home again.

New valve has blue, orange, grey and brown.
Old valve has blue, orange, grey and WHITE.
Is it safe to assume I can join white to brown?
Thanks

 

[flameport]

Brown=white MAY be correct. Or it could be completely wrong.
What is the make/model of the old and new valves?

 

[janno]

New valve is a myson mpe222, 2 port. The old one (over 15 years old, it was here when I moved in) is exactly the same, but has no serial number to confirm. I don't need to change the valve itself, just the actuator. The valve body and mounting plate don't need changing.

Janno

 

[Chri5]

New mv's have white which replaces brown, it's to avoid confusion since brown is now the primary new colour code live.

Replace the cables one for one, and white replaces brown.