"Total equipment isolation valves cannot gaurantee 100% leakage free."
Leakage trouble may cause big loses of industrial equipment such as contamination of fluid mixing,
personal accident by inhalation of toxic gases or unexpected explotion that leads to occasionally huge disatser.
Typical blank work have been had actual problems at site as follows
We developed innovative BOXY BLIND VALVE to replace existing blank, spectacle plate, DBB(Double Block and Bleed)valve and spool piece without pipe revision for the first in the world.