What is DN?

What is DN by Just Valves Perth?

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

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What is the PCD of a flange by Just Valves Perth? The PCD of a flange is one of the critical dimensions. PCD (Pitch Circle Diameter) is the diameter of a circle that goes through each of the bolt holes. 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
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