Double Block and Bleed Plug Valve

ansi-double-block-bleed11Structural Features

The double block and bleed plug valves have commonly been used for primary and secondary tight shut off, in an attempt to provide and ensure system integrity. Previously, the system integrity needed two individual isolation valves, a spool piece and a bleed valve that not only caused extensive costs and weight but also were increasing the risk of emissions due to multiple flanged faces.

These DBB plug valves have a single body with dual Plug valves with a bleed valve installed between the two main line valves and are available bi-directional with metal seat or rubber seat, both in ANSI Class VI.

They replace existing traditional techniques employed by pipeline engineers to generate a double block and bleed configuration in the pipeline.

  • Actuators, gear boxes and extended handles can be offered for these valves
  • Cryogenic and high-temperature applications are available
  • Soft or metal seated
Structural information                                      .BB-BG-OS&Y
Diving mannerHandwheel, bevel gear wrench
Design standardAP1599, API6D
Face to faceASME B16.10
Flange endASME B16.5

Note: the size of serial valve connecting flange can be designed according to customers’ requirement.

No.Part nameMaterial
1                                    .Body                                                 .ASTM A216-WCB, ASTM A217-WC1, WC6, WC9, C5, ASTM A351-CF8, CF8M, CF3, CF3M
2PlugASTM A216 WCB+N, ASTM A351-CF8, CF8M, CF3, CF3M
3GasketFlexible graphite+stainless steel, PTFE
4CoverASTM A216-WCB, ASTM A217-WC1, WC6, WC9, C5, ASTM A351-CF8, CF8M, CF3, CF3M
5BoltASTM A193-B7, A320-B8A193-B8M
6NutASTM A194-2H, A194-8, A194-8M
7PackingFlexible graphite, PTFE
8GlandASTM A216-WCB, ASTM A217-WC1, WC6, WC9, C5, ASTM A315-CF8, CF8M, CF3, CF3M
9WrenchASTM A216-WCB, ASTM A351-CF8, CF8M, CF3, CF3M
10Yoke nutCopper alloy ZQA19-4
11HandwheelASTM A536 Gr.60-40-18, ASTM A216-WCB


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Anfeng Industrial Park – Dong’ou Industrial Zone, Oubei, Wenzhou

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Via A. Moro, 61 San Donato Milan – Italy

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