Double block and bleed (DBB) valves are engineered for absolute isolation in high-risk applications where safety and system integrity are non-negotiable. These valves incorporate two independent sealing surfaces with a bleed point in between, allowing operators to verify isolation or safely vent trapped pressure.
By combining multiple functions into a single compact unit, DBB valves reduce the number of leak paths, simplify system design, and improve both safety and efficiency.
DBB valves are available in several configurations, including combinations of ball, plug, gate, and knife gate valves. Integral designs combine both block and bleed capabilities into a single valve body, reducing weight and installation complexity. Modular systems, on the other hand, offer increased flexibility by utilizing separate components.
Optional features, such as self-relieving seats, low-torque actuation, and corrosion-resistant alloys, ensure that these valves can endure harsh conditions, including high pressure, high temperature, and chemically aggressive environments.
In industries such as oil and gas, oil sands, power generation, and water treatment, DBB valves play a critical role in isolating process lines for maintenance, testing, or safety compliance. They are commonly employed in meter skids, instrument take-offs, and pipeline maintenance operations, where double isolation and a dependable bleed mechanism are crucial.
By providing both safety assurance and system simplicity, DBB valves contribute to reducing downtime, protecting personnel, and ensuring compliance with stringent industry standards.
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