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Double Block & Bleed Ball Valves

Continuous improvement and innovation in the engineering department has since long contributed to the development of high-quality Qublock ball valves this has led to stable and safe plant operations.

Product Range

Rating Class150 – 2500#, JIS10K – 63K
Size 1” – 40” (25A – 1000A)
Temperature up to 800 deg-c (1,470 °F)
Leakage Rate API598, Tight Shut Off
Design Code API608, ASME B16.5, ASME B16.34, ASME B16.10, MSS SP-72, ISO5211, ISO5752, API 6D

DBB valves are basically aimed to provide ideal isolations with a ball valve as defined in API 6D. The use of these valves obviously leads to savings in terms of space, weight, installation time, and cost, particular in the case of the application of special materials.

However, the greatest savings are to be seen in the reduction of leak paths to atmosphere, thereby reducing the risk of potential hazards. Dual isolation is a necessary requirement when plant maintenance is taking place downstream of the first isolation valve.

Space Saving

The replacement of single isolated valves with a true double block and bleed valve, but within the same overall length, ensures that expensive pipe work is kept to an absolute minimum, thus reducing the overall space requirements for the associated equipment.

Weight Saving

When compared to a conventional double block and bleed hook-up of two separate ball valves with a central spool piece and vent valve, weight savings are considerable.

Intrinsic Safety (Reduced Leak Paths, Double Isolation)

When compared to a traditional hook-up of two single 3-piece isolated ball valves with a standard trunnion design, Qublock’s DBB has been designed to reduce the number of potential leaks.