|
Edward Lowton
Editor |
|
| Home> | Plant, Process & Control | >Valves and actuators | >Certified Fire-Proof |
Certified Fire-Proof
14 August 2013
The Multi Rotation Lock (MRL) from Netherlocks has been thoroughly tested and awarded the Fire Test Certificate according to ANSI/API and ISO standards so that customers can be assured that in the event of a fire it will continue to function safely and will not cause disruption to the normal procedure of operation afterwards.
The interlock was subjected to temperatures of almost 1000°C for 20min and, after cooling, functioned correctly to safely lock and unlock the handwheel valve according to specification. During the test the lock was burned with one key in the lock; after cool-down the lock remained secure unless both keys were inserted, whereby it unlocked and operated smoothly as intended.
Netherlocks’ MRL is an interlock for multi rotation handwheel-operated valves. Following the interlocking principle, it only allows the handwheel to be turned when two keys are inserted into the lock, ensuring that it can only be operated when it is safe to do so. For example, key 1 might only be released when a relief valve has been opened, thus making it safe to close the main process valve. Once closed, it will release key 2, which can then be used to unlock the next stage of the operation, ensuring compliance with safe procedures.
