Actual Opening of a 1" butterfly valve???

[akthor]

Thinking about going with a nano pump that requires at least 3\4" ID on the inlet side.

I have 1" butterfly valves, whats the actual ID when open?

 

[MerlinWerks]

I have THIS one.

It measures 7/8"...

 

[akthor]

That's what I have but is the butterfly in the bore itself making it less than 7/8"?

 

[MerlinWerks]

I was wondering if that might be where you were going with this

With the valve open and eyeballing it with a ruler it looks like the two openings are 3/8" x 1/2" which should get you a net 3/4" opening or very close to it...

 

[mattd2]

What do you mean by "requires at least 3\4" ID on the inlet side"

Does it have a inlet sized for 3/4" pipe? one 1" butterfly valve should not affect the flow on a well designed pump input pipework to cause issues.

 

[MerlinWerks]

Well my eyeballs ain't what they used to be, I am able to slip an 19/64" drill bit into the spaces on either side of the butterfly, but since those openings aren't round there is still a bit of daylight on either side of the bit. I would still say the total net opening will be pretty darn close to 3/4".

FWIW, mine supplies a center inlet Chugger head that has a 3/4" input that I have reduced down to 1/2" for use with camlocks.
A pretty common setup I would think.

 

[akthor]

Its the large nano chugger, the inlet is 1" and it warns that it needs at min a 3/4" opening and no restricting of flow in the inlet side. Outlet is 1/2" and you can restrict it on that side.

http://www.brewershardware.com/Chug...ery-Pump-115V-230VAC-CHUGGER-MAX-CI-TEFC.html

Going with this pump since I'm building a 1bbl brewery and I will be pumping as far as 20' away from the brew kettle. Plus pumping 31 gallons of wort thru a chiller.if

 

[MerlinWerks]

FWIW, It was actually a 19/64" bit, not 11/64".