2. Abbreviations of Related Organizations and Standards / Glossary

ANSI        American National Standards Institute
API          Americal Petroleum Institute

ASME       American Society of Mechanical Engineers

BSI          British Standards Institution

DIN         Deutsche Industrie Norme (Germany)

DN          The ISO standard abbreviation for the nominal diameter of a pipe size 

ISO          International Standards Organizaiton

JIS           Japanese industrial Standards

KS           Korean Industrial Standards
Port         Fixed-area holes in the valve body where the process fluid enters and exits                after passing through the closure element.