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 manner Handwheel, bevel gear wrench
Design standard AP1599, API6D
Face to face ASME B16.10
Flange end ASME B16.5
Test&inspection API598,API6D

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

No. Part name Material
1                                    . Body                                                 . ASTM A216-WCB, ASTM A217-WC1, WC6, WC9, C5, ASTM A351-CF8, CF8M, CF3, CF3M
2 Plug ASTM A216 WCB+N, ASTM A351-CF8, CF8M, CF3, CF3M
3 Gasket Flexible graphite+stainless steel, PTFE
4 Cover ASTM A216-WCB, ASTM A217-WC1, WC6, WC9, C5, ASTM A351-CF8, CF8M, CF3, CF3M
5 Bolt ASTM A193-B7, A320-B8A193-B8M
6 Nut ASTM A194-2H, A194-8, A194-8M
7 Packing Flexible graphite, PTFE
8 Gland ASTM A216-WCB, ASTM A217-WC1, WC6, WC9, C5, ASTM A315-CF8, CF8M, CF3, CF3M
9 Wrench ASTM A216-WCB, ASTM A351-CF8, CF8M, CF3, CF3M
10 Yoke nut Copper alloy ZQA19-4
11 Handwheel ASTM A536 Gr.60-40-18, ASTM A216-WCB

 

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