Standards Development

Scope

This document provides basic requirements for valve torque in order to size a valve actuator for increased safety and reliability.

This document applies to part-turn actuated valve assemblies comprising valve (e.g. ball valve, butterfly valve, and plug valve), actuator and, when required, an intermediate support supplied as a package.

It defines the design considerations necessary for automating valves, the responsibilities for the information required and tasks to be completed, to ensure suitable actuator sizing, selection and assembly on the valve. It applies to pneumatic, hydraulic, electro-hydraulic, and electric actuators. An electric actuator coupled to a gearbox, as defined in ISO 5211, is included in the scope of this document. Lever or manual gearbox operated valves are excluded.

Purpose

The purpose of the standard is to enforce good work practices to ensure the reliability of automated onoff valves. Owners and operators of industrial plants have long complained about the failure of automated valves to open or close on demand, resulting in safety hazards and chemical spills to the environment. In 2019, an International association of end users (WIB, Dutch) issued a recommended practice for automation of part-turn valves. To ensure greater utilization and enforce consistency throughout industry, conversion of the recommended practice to an International standard is preferred