The ONIS D3B is an advanced all-in-one isolation system that integrates three essential components—an upstream valve, a quick-action line blind, and a downstream valve—into a single compact assembly. This intelligent configuration provides true double block, bleed, and blind functionality without requiring multiple separate devices or manual disassembly.

With its patented mechanical interlock, the ONIS D3B ensures the line blind cannot be operated unless both isolation valves are fully closed, thereby eliminating the risk of accidental operation under pressure. This design removes human error from the process, enhances operator safety, and guarantees a complete positive isolation.