Definition：

At present, marine valve selection primarily follows three major standards: German Standard (DIN)/Chinese National Standard (GB), American National Standards Institute (ANSI), and Japanese Industrial Standards (JIS).

1. DIN represents the German Standard, full designation: Deutsches Institut für Normung, which corresponds to nominal pressure rating PN. The pressure units are expressed in megapascals (MPa) or bar.

GB denotes the Chinese National Standard, full designation: Chinese Standard, with nominal pressure ratings equivalent to the German standard specifications. Examples include PN6/10/16/25.

2. ANSI represents the American Standard, full designation: American National Standards Institute. In ANSI pressure rating nomenclature, LB denotes pounds force, while CLASS refers to the corresponding American standard pressure class designation. 150LB and Class 150 are essentially equivalent expressions for the same pressure rating. American standard pressure classifications are designated using Class, LB, PSI, and other units.

For example: ANSI Class150/ 150LB/ 290PSI.

3. JIS represents the Japanese Standard, full designation: Japanese Industrial Standards, with corresponding pressure ratings designated by the symbol K.

For example: JIS 5K/10K/16K.

Standard Pressure Ratings:

Specification pressure ratings for shipboard valves under commonly used standards.

1.Pressure classifications for DIN/GB shipboard valves.

DIN/GB shipboard valve pressure classifications are expressed using PN designations, encompassing PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, and PN400, among others.

2. ANSI marine valve pressure rating classes.

ANSI valve pressure classifications primarily include Class 150, 300, 400, 600, 900, 1500, and 2500.

3.JIS marine valve pressure rating classes

JIS valve pressure classifications are expressed in K units, where K denotes Kgf/cm² (kilogram-force per square centimeter), encompassing 5K, 10K, 16K, 20K, 30K, 40K, 63K, and 100K, among others.。

Pressure Rating Conversion Table (For Reference):

No exact correlation exists between international pressure standards, however approximate conversions are applicable for valve selection reference. Corresponding unit conversion table: