/community-hubs/valves-actuators-regulators/b/valves-weblog/posts/separate-versus-integral-final-element-accessories-in-safety-160-applicationsFinal elements such as safety shutdown valves, emergency isolation valves, blowdown valves, etc., in safety instrumented functions (SIFs) are equipped with various accessories such as digital valve controllers, solenoid valves (SOV), and volume boostersen-USTelligent Community 13