General valve diameter and pressure unit conversion(Inch DN and Class Mpa PN)

07 / 29, 2025

General valve diameter unit conversion(Inch DN)

General valve pressure unit conversion(Class Mpa PN)

General valve diameter unit conversion (Inch-In and DN-mm)	Inch-In	1/8	1/4	1/2	3/4	11/4	11/2	2	21/2	3	31/2	4	5	6	8	10	12
	DN-mm	4	8	15	20	32	40	50	65	80	90	100	125	150	200	250	300
	Inch-In	14	16	20	24	28	30	32	34	36	42	48	54	60	64	72	80
	DN-mm	350	400	500	600	700	750	800	850	900	1050	1200	1350	1500	1600	1800	2000

ASME Class	150	300	400	600	900	1500	2500	4500
Nominal pressure MPa	0.6MPa 1.0MPa 1.6MPa 2.0MPa	2.5MPa 4.0MPa 5.0MPa	6.4MPa	10.0MPa	15.0MPa	25.0MPa	42.0MPa	76.0MPa
Nominal pressure PN	PN6 PN10 PN16 PN20	PN25 PN40 PN50	PN6.4	PN100	PN150	PN250	PN420	PN760

The PN European system refers to the pressure at 120°C, while the Class American Standard system refers to the pressure at 454°C (CL150 at 260°C).

Generally speaking, the nominal pressure rating for an American Standard 150 lb is 2.0 MPa, and
the nominal pressure rating for a 300 lb is 5.0 MPa.

1 lb = 0.45359237 kg
1 psi = 1 lb/in² = 0.069 bar
1 bar ≈ 14.5 psi ≈ 0.1 MPa ≈ 100,000 Pa ≈ 1 kgf

ZZJG Valve provides the above information on how to calculate general valve diameter and pressure. If you want to know more about general valve diameter and pressure, please contact us via WhatsApp or email.

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