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Valve solenoid interlock - NDL
Ninety degree lock - NDL (trapped key interlock)The NDL locks is the standard type for 90 degree valves e.g. ball-, butterfly- of plug valves. The NDL can be mounted without any alternation to the host valve, the characteristics of the valve remain. The lock is an integral part of the valve, the original valve lever is removed and replaced by the NDL with a new same sized Stainless Steel sliding lever.