Smith Flow Control’s technology makes valve interlock adjustment effortless

By admin July 22, 2014 5:15 pm IST

Trapped-key interlocks offer enhanced safety and efficiency for the most difficult process management challenges. Mounted directly to valves, interlocks ensure a process only happens in the correct operational sequence
Trapped-key Interlocks for handwheel-operated valves are different from those for lever-operated valves, as the latter only have a finite movement (normally 90 degrees). Interlocks on handwheel-operated valves, however, usually require several full revolutions between the locked open and locked closed positions.
Because of this, handwheel-operated interlocks need to be able to ‘count’ the number of handwheel turns in order to release keys in the required open and/or closed positions. Similarly, with gate and globe valves, the closed position can vary through the effects of valve seat wear. After a period of use, the closed position on gate and globe valves may have altered. This can mean that when the valve is shut tight, the interlock (closed) key will not release as the valve has travelled past the original set key release position.

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