DOUBLE BLOCK AND BLEED BALL VALVES (DBB)
DBB ball valves
A DBB (double block and bleed) ball valve is a type of valve designed to provide effective sealing in piping systems, ensuring isolation from both sides of the valve, with the added ability to bleed pressure between the two isolated sections. This valve is commonly used in industries such as oil and gas, petrochemical and other applications where safety, isolation and maintenance are critical.
Double Block (DB):
A DBB ball valve has two seating surfaces (blocks) that can isolate the pressure on the upstream and downstream sides of the valve. These two blocks prevent the passage of any fluid or gas when the valve is closed.
The two blocks are normally created by using two separate ball valves in one body or two sealing mechanisms in one valve.
Bleed (B):
A bleed mechanism (usually a small valve) is placed between the two blocks. It allows the pressure trapped between the two sealing surfaces to be released (or vented). This feature helps to confirm that the valve is properly isolating the flow and can also be used to safely depressurise or drain the system for maintenance purposes.
PRODUCTION RANGE
Single Body DBB Valve
In this design, the block and bleed functions are housed in a single valve body, with two independent sealing surfaces and a bleed port.
DBB Double Body Valve
It consists of two separate valves arranged in series, with a bleed valve in between.
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