ERLANGER, Kentucky -- Smith Flow Control (SFC) has introduced valve interlocks systems that control the sequence in which process equipment may be operated.
These interlocks systems use a key transfer principle to ensure operational control of safety-critical systems involving worker intervention, according to SFC. The QL interlock fits all types of lever-operated quarter-turn valves including ball, butterfly, and plug valves, the company says. The GL interlock is made for handwheel-operated valves including gate, globe, and gear-operated valves. The SFC DL3 interlock, made specifically for pigtrap/pressure applications, is adaptable to all types of vessel or access closures, SFC says.
The interlocks are constructed of stainless steel and are quickly installed on any valve or associated equipment with no modifications required, according to the company.