Chiyoda Piping Engineer Neeraj Batra explains technical terminology. Valves are essential to a plant’s control, shutdown and isolation philosophy. This article will therefore address the definition of (i) tight shut off, (ii) unidirectional / bidirectional and (iii) double block and bleed / double isolation and bleed. The article is not limited to any specific oil and gas industry domain such as refining, petrochemicals or LNG.
via: Valve World