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Basic principles
Key code on lock
Key code on key
Position for open key
Position for close key
> Green start key is inside the key cabinet in its
dedicated position (green = normal operation)
> Yellow keys in locks in the eld are trapped and
designated to stay in the eld
> A key only ts in lock with the same key code
> Insert key to unlock, operate and after operating
remove the other key
> After last valve operation, insert end key into
dedicated position in the key cabinet.