Ninety Degree Lock (NDL)0 pages

Process Interlocking
Ninety Degree Lock (NDL)
This type of lock can be installed on any type of valve
that operates with a 90º rotation, like ball-, butterfly-,
and plug valves.
The NDL can be mounted without any alteration to the
host valve, and the characteristics of the valve remain
unchanged. The lock is installed as an integral part of
the valve, with the original valve lever removed and
replaced by the NDL with a new, same-sized Stainless
Steel sliding lever
The principle of mechanical key interlocking is the
transfer of keys. Each lock is executed with two keys:
one for the locked open position and one for the locked
closed position. When the valve is open the “open” key
is released, can be removed ready to operate the next
lock in the sequence, which will share the same code. All
keys are unique and depending on the sequence
NETHERLOCKS will determine the codes to guarantee
the required sequence.
Technical Specifications:
o Fully made of stainless steel AISI 316
o SS AISI 316 lever is provided in the same size as the
original
o Robust, reliable and simple design with a minimal
amount of parts
o Maintenance free, No grease
o Tamperproof
o Mounting is very easy and can be done without
shutting down the plant or making modifications to
the valve
o Invulnerable for sand, dirt, snow, ice, etc.
o Thoroughly tested to withstand the most extreme
operating environments
o Integrated second safety to prevent unlocking with
an unauthorized object other than the designated
linear key