honeywell 4073 diverter valve. Ist this right.

[pannierstan]

To be honest Softus, the replies you have received from Honeywell & Fernox are exactly what I would have expected. Neither company is going to rubbish each other's products and would certainly not admit any problem to a casual enquirer (no disrespect to your goodself).

I feel, from other forum member's posts, that there is a problem but the chances of getting to the bottom of it are virtually nil.

Soggy_weetabix - just because you have never had a problem does not mean it does not exist eleswhere - I therefore stand by my original comment (which is bourne out to an extent by ChrisR's last post)

I agree with your comment Giblets.
They would not admit it even if they knew there was a problem. Lets think back to the Potterton Suprima saga.
I was certainly aware that older valves seemed to suffer more and Chris mentioned.

Stan

 

[PartTimeEngineer]

If oil-based chemicals of any kind are used in the treatment of the system--the ball can swell. Stick to additives you know and trust. These swells are contained to systems not to all Honeywell valves. I've seen these last for 20 years+ untouched.