Replacing central heating zone valves

[woodglass]

Are all manufacturers 2 port zones valves directly interchangeable ?.

i.e., can I replace a Honeywell V4043 with a Drayton model ?.

TIA, woodglass

[John]

Yes but why change a Rolls Royce for a Trabant

[woodglass]

A new Trabant works - a f****d Rolls Royce doesn't :-(

woodglass...

[Ed Sirett]

What's wrong with the Honeywell? Replace the motor, or if needed, Replace the head, of if needed, Replace the valve with another Honeywell or Horstmann.