Instrumentation Double Block and Bleed (DBB) Valve

ALIS Valves offers Instrumentation Double Block and Bleed (DBB) Valves for applications requiring reliable isolation, pressure monitoring and safe maintenance of instrumentation systems. These valves combine two independent isolation barriers with a bleed port between them, allowing trapped pressure or fluid to be released or checked when the isolation valves are closed. Their compact design helps reduce installation space and simplify piping arrangements compared with separate valve assemblies. Depending on the configuration, instrumentation DBB valves can integrate functions such as process isolation, cavity bleeding and instrument connection within a single unit.

Instrumentation Double Block and Bleed Valves are suitable for compatible applications in oil and gas facilities, refineries, petrochemical plants, chemical processing systems and industrial instrumentation installations. They are commonly used with pressure gauges, pressure transmitters, differential pressure instruments and sampling systems where dependable isolation is essential for inspection or maintenance. Important selection factors include operating pressure, temperature, process media, valve size, connection type, body and seal materials, instrument port configuration and applicable industry standards. Selecting the appropriate DBB valve helps support effective isolation, convenient instrument servicing and reliable performance under the specified operating conditions.