Quick 3 port valve question

My valve has V4073A1039 written on the back. Is a V4073 the same as this?

Bob

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

V4073A1039

22mm compression. 6.0 KV. Maximum close-off differential pressure 0.69 bar

V4073A1054 As above, but 3/4" BSP Female

V4073A1088

28mm compression. 8.1 KV. Maximum close-off differential pressure 0.55 bar

V4073A1062 As above, but 1" BSP Female

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

8.1 KV refer to!

HTH!

Reply to
Roger Mills

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.

Reply to
Adrian C

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

Reply to
Graham.

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

Reply to
Bob Smith

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

Reply to
Bob Smith

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

Reply to
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.

Reply to
Roger Mills

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

Reply to
geoff

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

Reply to
YAPH

Is that not the V4043 ?

Reply to
geoff

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

3-port over th'interwub blithely assuming that only the first 6 characters of the part code would be significant and finding I'd got the diverter rather than the mid-pos.
Reply to
John Stumbles

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