In 30 years on my CH system I've only had to replace one 3 port valve.
Do zone valves get “tired”?
Dec 08, 2023
Last reply: 2 years ago
26 Replies
The only one I have is a 2-port unit. I think I should be glad.
The MOMO design of 3-port seem, by design, to be more reliable - no springs involved, no deliberate stalling of the motor under power. They just motor to position, then switch completely off, until called to move again.
There are two port valves like that, too. They are making comeback.
A lot depends on how much limescale build up you get. A good installation with no leaks and full of additive in a soft water area is fine. But when you are in a hard water area and a lot of topping up without additives goes on - typically because of a failed pressure vessel or minor weeping from some gland - you get scale build up the jams the valves.
what if you operate the remainer ?
I expect systems to fail more with a lack of maintenance and running without an inhibitor.
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