Modular Double Block and Bleed Ball Valve

Production Range Trunnion DBB ball valves
Size NPS 2"~24" (50mm~600mm)
Pressure ASME Class150~1500LBS (PN16~PN250)
Material A105, LF2, F304/F304L, F316/F316L, 16MN, 20 ALLOY, F51, F91, C95800 ETC.
Production Standards API/ANSI/ASME/EN/DIN/BS/GB/GOST
Design& MFG code API6D/ API608/ ISO17292
Test & Inspection API 598, API 6D, ISO5208/ISO 5208/EN12266/GOST 9544

Products Details

QL has the DBB ball valves /Double block and bleed ball valves/Double isolation and bleed ball valves /DBB dual ball valve in ranges design,material, size, pressure and ends connections, providing reliable isolation solution for use in upstream, midstream and downstream in oil and gas, petrochemical, transmission and storage applications. The trunnion type DBB ball valve is the split body 3pcs body and bolted bonnet integral body design, the valve operation according to valve size like hand lever, gear box, pneumatic or electric. Trunnion ball type DBB ball valve has more flow capacity than small size floating type DBB. The two balls integrated in union body as block /isolation valve and a bleed valve for drain or vent the trapped cavity fluid in order to isolation the downstream pipe or prevent any serve medium leakage possibility. DBB ball Valves suitable for pipeline applications where the shut down plant is not affordable but the repair or clean is compulsory, the DBB system which will depressurize the system and isolate a particular section and then can work on it without interfering whole process plant.DBB ball valves /Double block and bleed ball valves/Double isolation and bleed ball valves use all the design features and benefits of a single DBB trunnion ball valve, but more special in its double isolation performance. The body is generally is manufactured from forged or bar stock material to ensure a high integrity pressure envelope for the valve body (housing). ● Double secure isolation more reliable to safety factor ● Zero leakage performance credibility ● Bleed and depressurize pipeline system ● Less installation space and less weight in pipeline ● Easy one step operation in one union body ● Less cost in material and labor ● Inline repair or maintenance check allowable by not shut down plant,improve plant efficiency ● Fire safe API607 ● Anti-static design API608 ● Cavity self relief ● Double block and bleed ● Seals: o ring/graphite for general service /graphite for high temperature service/ lip seal+graphite for cryogenic service ● Seat: soft/metal seated for general service, metal seated for high temperature service ● Seat design: Self relieving or double piston effect seats ● Valve seat bi-direction sealing ● Bonnet: extend stem for high temperature/cryogenic service Emergency grease injection device for soft seated trunnion ball valve. For the valve size about DN150 trunnion ball valve, both the stem and seat has the grease injection device, for size below DN125,the valve chamber has the grease injection device. In case of the seat sealing or stem o ring damaged, the emergency grease injection will seal the damaged area and prevent the medium leakage. QL DBB ball valves could be designed with soft seat or metal-to-metal seat. Metal seated for high temperature or particle medium. The sealing is reliable and suitable for the severe working conditions.


QL has the ranges of DBB ball Valves suitable for Oil & Gas production, processing, transportation, distribution, chemical and petrochemical refining including system isolation, pressure level and flow measurement, instrument drain, chemical injection and sampling for smaller sizes. QL ball valves designated in highest performance and produced in strictest quality. Contact our sales engineer for your specific fluid needs. appllcation

DBB ball valves /Double block and bleed ball valves/Double isolation and bleed ball valves /DBB dual ball valve

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