Valve size in inches for DN 40 with 44.8 mm internal thread diameter?

Hello. As I am not an eagle from the inch nomenclature, I ask the question - what is the size of this valve? The internal diameter of the thread is approx. 44.8. How many inches are "hydraulic"?



There is also DN 40 on the other side of the valve.

1.1 / 2 inch. DN 40 is the diameter of the valve ball bore.

mariuszspa wrote:

1.1 / 2 inch. DN 40 is the diameter of the valve ball bore.

Thank you. But how do the inch and a half to the diameter of the "hole" in the valve? I'm not questioning the answer - I just don't get it. There is, for example, a 1/2 inch pipe that has much more inside than the 12.5mm. What's going on?

I also can't keep up with the plumbers for them 32 mm is an inch

karolark wrote:

I also can't keep up with the plumbers for them 32 mm is an inch

It works out because, as I remember, a half-inch tube has just 16mm inside.

The pipe thread size in inches is the lumen diameter of the pipe. With a thin-walled pipe, there is a difference between what should be and what is.

mariuszspa wrote:

The pipe thread size in inches is the lumen diameter of the pipe. With a thin-walled pipe, there is a difference between what should be and what is.

Well, but what has "thin-walled" or "thick-walled" to the diameter of the light itself? Besides, in my valve, the hole in the ball is about 35mm, so it has nothing to do with the 1 1/2 inch. I'm still not questioning knowledge, just trying to make sense of it.

1.1 / 2 inch is 38.1mm, pipe and 1.1 / 2 "thread has a diameter of 48.5 (approx.). Plumbing pipes have a wall thickness of about 2.5mm to 5.5mm. The rest is easy to understand, thread has a constant dimension according to the standard, it is a cylindrical Whitworth TUBE thread, it can also be tapered.

Thanks. But why is a 1/2 "pipe about 16mm inside?

This is 1/2 inch tubular. Imagine a 1/2 "pipe with a 4mm wall, its wall is 2.5mm therefore 16mm.
Compare Whitworth pipe threads with regular Whitworth threads, e.g. English threads.
http://www.lwcad.republika.pl/din_gwint/s194.jpg

balonika3 wrote:

Thanks. But why is a 1/2 "pipe about 16mm inside?

An inch is one of the measurement units and amounts to 25.4 mm and the "tubular inch" is not a unit of measure but a conventional and standard thread dimensions needed to connect individual pipe dimensions, which are still given in inches, and the designation inch is "by number, often with a fraction e.g. 1 1/2 ", 2" 1/2 "
the 16 mm in the 1/2 "pipe, I mean it," the roughness allowance inside the pipe and, to some extent, the dependence between the individual pipe sizes.
I have to add that the pitch of the pipe threads is also in inches, i.e. it specifies the number of thread turns at 1 "and is marked e.g. 1" 12 TPI (threads per inch), although on pipes it is standard and the same diameters have the same thread pitch, worse with screws.

The external dimensions of the pipes are and must be constant due to the threads, and now if the wall thickness of the pipe changes, the "light" of the pipe also changes.
I remember that once these dimensions ext. pipes were closer to the "truth" or actual inch dimensions.

Thank you, the topic is exhausted. You can close.

Google ---> Table of preliminary thread recognition