<a href="https://www.naffco.com/uae/en/">NAFFCO</a> <a href="https://trigafiresolutions.com/product/lock-shield-valve/?preview_id=951&amp;preview_nonce=b028f159dd&amp;_thumbnail_id=953&amp;preview=true">Lock Shield Valve</a> is usually installed where
the unauthorized operation has to be avoided. A typical
application of this valve is installing these at inlet pipe to
the hose reel where it can be opened only by key and key
kept by maintenance or fire safety department.