Models QL and GL ensure potentially hazardous valve operations are performed in the correct sequence, eliminating the possibility of operator error or deliberate sabotage. They can be integrated with any size of ball, plug, gate, butterfly and globe valve. Mechanical interlocks are typically used to support “permit to work” procedures such as safety relief valve changeover, pig trap loading and retrieval, or filter changeover. The interlocks are designed to replace handwheels or levers. On-site lock re-coding allows plant managers to quickly adapt interlocking sequences to changes in process logic.

Smith Flow Control
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