DIY Doctor UK DIY Forums

i need new valves and was wanting to replace them.
Ive looked up "normally closed" honeywell valves, can anyone advise what that means.
I know the ones i need are 22mm two way valves.
Is there a certain type i need or do all valves operate the same?
Thanks

Easiest way is to remove the actuator head and find the data badge that will tell you the make, model and serial number. Take this to a Plumbing / Heating supplies shop and ask if they have one.

Then all the wires are the same colour, so replacing shouldn't be too difficult.