Double isolation and bleed valve

Update Date:2016-06-03     Pageviews:926


Double isolation and bleed valve


The purpose of a double isolation and bleed valve is to provide a single valve that simultaneously isolates the upstream and downstream systems, while verifying the integrity of the isolation by venting the body.

Double isolation and bleed valve do not provide positive double isolation when only one side is under pressure. Therefore, the definition of a Double Isolation and Bleed (DIB) valve is to stop process from upstream getting into the downstream. It provides provable zero leakage for product segregation and transfer. DIB valves have two seating surfaces that, when in the close position, provide a seal against pressure from an upstream source and allows for the venting/bleeding of the body cavity between the two seats.

To properly specify a DBB or DIB, you need to have a good understanding of your desired outcomes. Coupled with manual or automated internal body relief solutions, selecting the correct technology can be challenging. The experts at Spartan can help you select the proper valve for your application.


Size range: from ½ ” to 3” for instrumentation valve; from 1” to 24” for piping valve. In all pressure class ratings from 150 Lbs to 2500 Lbs, API 3.000 to API 10.000.

Such a kind of valves are of course manufactured in full compliance with most important product specifications adopted in chemical and petrochemical plants, like API 6D, ANSI, ASME, British Standard etc.

The standard production includes ASTM materials like A105N, F60 and LF6, A350 LF2 for low temperature, A182 F316(L), Duplex F51, Super Duplex F44, F53, F55 as well as a wide range of special materials like Hastelloy, Inconel 625 or 825, Monel K and Titanium Class 2.

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