/community-hubs/deltav-community-connect/b/safety-weblog/posts/when-is-a-sil-suitability-rating-required-for-final-control-elementsAbstract Final Control Elements (Control valves or Safety Shut Down Valves) are the key components of any close loop control system, whether it is used for Basic Process Control Systems (BPCS) or for Safety Instrumented Systems (SIS). Financial constraintsen-USTelligent Community 13