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The double block and bleed valve is abbreviated to DBB valve. It is made up of two ordinary ball valves linked by a common inlet end. The double block and bleed ball valve is a product intended to substitute several connections between conventional valves; as the name suggests, it is a double block and bleed ball valve. The distinction between this DBB valve and the conventional one is that it can effectively overcome leakage that happens during system operation, and it can be quickly closed and can discharge easily. This DBB ball valve is a modern form of valve that is commonly used on the market today.