Double Block and Bleed Trunnion Mounted Ball Valve
Key Specifications / Features
Usually, there are two types of double block and bleed trunnion mounted ball valves, according to the experience of customer request.
Type 1- a trunnion mounted ball valve in the closed position, provides a seal against pressure from both ends of the valve with a means of vending/bleeding the cavity between the seating surfaces.
The ordinary trunnion ball valve have the feature of double block and bleed function.
Type 2- a trunnion mounted ball valve with two balls and a bleed valves.
These valves have a single or side entry body design with double ball valves with a bleed valve installed between the two main line valves. These valves are available bi-directional in metal seated and soft seated style, in bubble tight shut off. Sometimes called twin valves, DB&B valves are available in Plug and Trunnion Ball type up to 600mm NB in ANSI 150 to 2500 class. These DB&B design valves replace existing traditional techniques employed by pipeline engineers to generate a double block and bleed configuration in the pipeline.
What to look for when selecting a double block and bleed valve?
As with any valve, during selection, one should consider the fluid properties, pressure, temperature. Perhaps most importantly, however, is how the valve will be used. With a number of configurations offered, consider which of these will fit your process and needs best.
If you're unsure which double block and bleed valve is right for you process, talk to an engineer. They can help determine which one will achieve your objectives best.