MV location and restriction?

Joined
24 Nov 2013
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Location
Berkshire
Country
United Kingdom
HI

From some great help on another thread, I've determined that I have an issue with the hot water 2-port MV leaking water when the CH is on. The MV was a Drayton ZA5 and I decided to buy a Honywell based on reviews on this forum. I've got two quick questions:

1/ Can or should I move the MV from its current position in the flow right after the pump to the return after the hot water tank? I'm thinking it might be stressed less due to lower temps and maybe pressure.

2/ I don't understand why both the Drayton and this Honeywell are not full-bore. Doesn't that restrict the flow a lot?

Thanks in advance if anyone knows the answer to these.
 
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