Comparison table of valve diameter (DN) and pipe diameter

The size of the valve caliber has an inevitable relationship with the size of the pipeline. It is usually said that the pipe diameter (outer diameter) is matched with the valve. The valve diameter needs to be calculated according to the actual parameters. Generally speaking, the pipeline will be larger, and the valve actually needs to be smaller. It mainly depends on the flow rate to be controlled by the valve position, and the pipeline size only needs the flow capacity.
(1) Comparison table of pipe fitting size and valve diameter and inches:

Diameter/inch	DN (Norminal diameter) mm	pipe OD (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) Valve diameter DN (nominal diameter) corresponds to the outer diameter of the pipe Ф (mm):

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

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

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