Industrial-process control valves. Part 1: Control valve terminology and general considerations.

This technical specification establishes fundamental terminology and general considerations specifically tailored for control valves used within industrial process control systems. It serves as a foundational reference for defining the language and basic principles governing the selection, application, and performance evaluation of these critical flow regulation devices. The document provides essential definitions that ensure consistency in communication among manufacturers, engineers, and operators across the global industry. By outlining the general aspects of valve operation, it helps in understanding the functional requirements and typical characteristics inherent to process control applications. This work forms the basis for subsequent specifications dealing with detailed design, testing, and rating criteria. It addresses the core concepts necessary for specifying valve behavior under various operating conditions without delving into specific construction details or proprietary technologies. The content focuses on creating a unified understanding of the subject matter to facilitate international trade and technical cooperation. Through standardized nomenclature, it supports the development of safer and more efficient process management strategies. This resource remains a key reference for professionals involved in the design and implementation of fluid control systems.