PN and Class Pressure Ratings

The pressure rating of Batu Valve products is given in two systems: PN in European standards and Class in American standards.

Pressure ratings

PN: European (DIN / EN); nominal pressure in bar

Class: American (ANSI / ASME)

Class 150: PN 20

Class 300: PN 50

Class 600: PN 100

1 bar: 14.5 psi

PN rating

PN is the European (DIN / EN) pressure rating; it indicates the nominal pressure in bar. Ratings: PN 1 · 1.6 · 2.5 · 4 · 6 · 10 · 16 · 25 · 40 · 64 · 100 · 160 · 250 · 320 · 400.

Class rating

Class is the American (ANSI / ASME) pressure rating. Ratings: Class 150 · 300 · 400 · 600 · 900 · 1500 · 2500.

Class – PN conversion

Class	PN (bar)
150	20
300	50
400	64
600	100
900	150
1500	250
2500	420

ANSI – DIN pressure class conversion table

Working and test pressures

The values below apply to carbon steel body API 6D valves.

Class	Working pressure (−29 … +38 °C)	Working pressure (100 °C)	Shell test	Seat test
150	19.6 bar	17.7 bar	29.4 bar	21.6 bar
300	51.1 bar	46.6 bar	76.7 bar	56.2 bar
600	102.1 bar	93.2 bar	153.2 bar	112.3 bar
900	153.2 bar	139.8 bar	229.8 bar	168.5 bar
1500	255.3 bar	233.0 bar	383.0 bar	280.8 bar
2500	425.5 bar	388.3 bar	638.3 bar	468.1 bar

The shell test is 1.5 times and the seat test 1.1 times the working pressure.
The permissible working pressure decreases as temperature rises.
Values vary with the material grade.

Pressure on the valve nameplate

The nameplate on the valve states the pressure rating together with pressure and temperature values; for example, on a Class 300 valve, 52 bar at −29 °C and 47 bar at +100 °C. The operating limit is the maximum working pressure stated in bar on the valve.

After installation, the line is tested at 1.5 times the nominal pressure on the nameplate and checked for leakage.

MOP

For natural gas valves, MOP denotes the "maximum operating pressure". Batu Valve natural gas valves are rated MOP 5 – 20.

Pressure units

Unit	Equivalent
1 bar	14.5 psi · 0.981 kg/cm² · 100 kPa
1 kg/cm²	14.22 psi
1 psi	0.0689 bar

Lbs/sq.in – kg/cm² conversion table

Frequently asked questions

What does PN 16 mean?How many bar is Class 150?What is the difference between PN and Class?Does temperature affect the pressure limit?

PN is the European pressure rating that indicates the nominal pressure in bar. DIN and EN equipment is marked with PN; at ambient temperature this is close to the value in bar: PN 16 is 16 bar, or approximately 16.3 kg/cm².

Class 150 corresponds to PN 20. For a carbon steel body API 6D valve the working pressure is 19.6 bar between −29 °C and +38 °C and 17.7 bar at 100 °C.

Both are pressure ratings. PN is the European (DIN / EN) designation and Class the American (ANSI / ASME) designation; the correspondence between them is given in the conversion table.

Yes. The permissible working pressure decreases as temperature rises. For Class 300 it is 51.1 bar at −29 … +38 °C and 46.6 bar at 100 °C.