Double Block Bleed Service
Characteristics of working conditions
On the upstream long-distance pipeline, in order to cut off the medium pressure from both ends of the valve at the same time, the valve with double blocking and double discharge (DBB) function is selected to cope with the working condition that both ends of the valve may bear pressure at the same time.
Recommended valve selection

FBV is recommended to adopt twin ball trunnion ball valve with double block and bleed function.

The double block and bleed (DBB) ball valve designed and manufactured by FBV can fully meet the user's demand for simultaneously cutting off the pressure from both ends of the valve. During the delivery inspection, a special DBB supplementary test will be added after all the conventional valve tests are completed, so as to ensure that the valve purchased by the user can fully meet the user's functional requirements.

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