/community-hubs/valves-actuators-regulators/b/valves-weblog/posts/when-is-a-safety-integrity-level-rating-of-a-valve-requiredControl valves play a large role in process control. Emerson’s Riyaz Ali shared with me that he is often asked about their use in safety instrumented functions (also known as safety loops). When asked recently, he shared an ISA Safety Division ...en-USTelligent Community 13