Quick 3 port valve question

Yes and no! There are several versions of the V4073A, with different water connections as follows:

V4073A1039

V4073A1054 As above, but 3/4" BSP Female

V4073A1088

V4073A1062 As above, but 1" BSP Female

All the above taken from Honeywell's spec sheet. No idea what the 6.0 and

HTH!

If this is a question on replacement for one that has failed, you are aware that the head actuator is available separately?

Mine unfortunately last me a couple of years, either the switch dies or the motor. I now have enough to do Frankenstein remodels.

In my case, motors from eBay for about a fiver, micro-switches salvaged from scrap microwave door interlock.

A replacement for one where the valve is broken. The system was drained down for over a year, and the valve will not close to the HW only position. I took the head off and found it did not have full travel.

Bob

Thanks! As long as I get a 22mm one I should be fine.

KV to me would mean kilo volts. It must mean something else in this case.

Bob

Its the flow rate through the valve at a given differential pressure on the system (a bit like a resistance value).

I have no idea how to correctly calculate the right one for a given system, I generally (possibly wrongly) replace with the same as I took out.

TW

Yes - it certainly doesn't mean that in this case!

Looking more closely at the spec sheet, it appears to be something to do with flow vs pressure drop - with the larger 28mm/1" valve passing a greater flow at a given pressure drop than its smaller 22mm/ 3/4" cousin. I'm still no wiser as to what KV stands for nor, indeed, CV where - according to the chart - CV = 0.97 x KV ! FWIW, pressure drop seems to be measured in 'mwc' - and I'm not sure what that is either.

Or kV to the rest of us (kilo with a lower case "k")

Also IIRC some versions are diverters, some are mid-position.

Is that not the V4043 ?

Dunno, and cba to chase the specs, but ISTR ordering a vanilla Honeywell