What is DN when referring to valves

What is DN?

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What is DN?

DN stands for ‘Diameter Nominal’.  Put simply, it is a rough translation of mm from imperial sizes, assuming that an inch is 25mm.

We refer to a 12″ flange as DN300, when in fact it is 304mm.

Please use the table below for your reference and if you have any other questions, please ask the Just Valves team.

½”

DN15

¾” DN20
1″

DN25

1¼” DN32
1½” DN40
2″ DN50
2½” DN65
3″ DN80
4″ DN100
5″ DN125
6″

DN150

8″ DN200
10″

DN250

12″ DN300
14″ DN350
15″ DN375
16″ DN400
18″ DN450
20″ DN500
24″ DN600

 

Let the Just Valves team find it for you...