NetherLocks PROCESSINTERLOCKING - Basic Principles of Valve Interlocking

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Lock A Lock BKey cabinet Situation
Basic principles of valve interlocking
Green start
key from key
cabinet to
lock A
Yellow switch
key from
lock A to lock B
Red end key
from lock B to
key cabinet
Operable
Locked closed
Operable
Locked open
Locked open
Locked open