Engineers specifying instrumentation isolation often face a choice between a dedicated double block and bleed instrument valve and a conventional multi-valve instrument manifold. Both achieve similar isolation objectives, but differ meaningfully in footprint, leak paths, and maintenance approach. This guide compares the two to help engineers determine the right specification for their...
Double block and bleed (DBB) valves are widely specified across pipeline, refining, and process industries, but the design details vary depending on the closure mechanism, pressure class, and service conditions. This guide walks through the operating principle step by step, the main valve types used to deliver DBB function, and where each is typically applied.
Step-by-Step: How a DBB Valve...
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