High Pressure Double Block and Bleed (DBB) Valve

ALIS Valves offers High Pressure Double Block and Bleed (DBB) Valves for industrial applications requiring reliable isolation, pressure management and enhanced safety during maintenance and servicing operations. These valves combine two independent sealing barriers with a bleed port between them, allowing the trapped pressure or fluid in the intermediate cavity to be released or monitored when the isolation barriers are closed. This arrangement helps verify isolation and reduce the risk of process fluid passing into downstream equipment during suitable operating conditions. Their compact design can also help reduce installation space compared with separate valve arrangements, depending on the configuration.

High Pressure Double Block and Bleed Valves are suitable for compatible applications in oil and gas facilities, refineries, petrochemical plants, chemical processing industries and high-pressure pipeline systems. They are commonly used in instrument isolation, sampling points, process connections and maintenance applications where dependable isolation is essential. Important selection factors include operating pressure, temperature, process media, valve size, body and seat materials, end connections, sealing requirements and applicable industry standards. Selecting the correct DBB valve configuration helps support effective isolation, controlled cavity bleeding and reliable operation under the specified service conditions.