Butterfly valve size and pipe size comparison table

Date: Jun 08, 2022 2,566 views Source: VALTEC China Valve Manufacture CO.,LTD

As we all know, there is an inevitable connection between the diameter of the butterfly valve and the size of the pipeline. Generally speaking, the diameter (outer diameter) matches the butterfly valve. Butterfly valve diameter needs to be calculated according to the actual parameters. Generally speaking, the pipeline will be larger, but the actual valve will be smaller, which mainly depends on the flow rate to be controlled by the valve position, while the pipeline size only needs to have enough circulation capacity.

1. Comparison table between pipe size and butterfly valve size and inch:

Diameter inches	DN-Nominal Diameter (mm)	Outside Diameter of Pipeline (mm)
1/4″	8	13.7
3/8″	10	17.14
1/2″	15	21.3
3/4″	20	26.7
1″	25	33.4
1.2″	32	42.2
1.5″	40	48.3
2″	50	60.3
2.5″	65	73
3″	80	88.9
4″	100	114.3
5″	125	141.3
6″	150	168.3
8″	200	219.1
10″	250	273
12″	300	323.8
14″	350	355.6
16″	400	406.4

2. Butterfly valve size DN (nominal diameter) corresponding to the pipe outer diameter ф (mm):

Nominal Diameter (DN)	Outside Diameter of Pipeline ф (small outside diameter)	Outside Diameter of Pipeline ф (large outside diameter)
15	18	22
20	25	27
25	32	34
32	38	42
40	45	48
50	57	60
65	73	76
80	89	89
100	108	114
125	133	140
150	159	168
200	219	219
250	273	273
300	324	325
350	360	377
400	406	426
450	457	480
500	508	530
600	610	630
700	720
800	820
900	920
1000	1020
1200	1220
1400	1420
1600	1620
1800	1820
2000	2020

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Learn More: Butterfly Valve