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Double Block & Bleed Valves


Bonney Forge manufactures Double Block and Bleed Valves ( DDB valve)  in an extensive range of designs, materials, sizes, pressure classes and end connections that are designed in accordance to ASME B16.34 and where applicable API 6D or BS EN ISO 17292. The valves are fire-safe test approved and include design features to ensure electrical continuity between ball, stem and body. Cryogenic and high temperature metal seated configurations are also available. All designs are forged for improved mechanical properties, pressure retention, and quality.

The primary uses for Double Block and Bleed Valves are:

  • Instrument double block and bleed for chemical injection and sampling
  • Instrument double block and bleed for pressure gauges
  • In-line double block and bleed for process isolation

Benefits of using Bonney Forge Double Block and Bleed Valves are:

  • Improved Safety – Reduced number of leak points as compared to traditional methods.
  • Cost Savings – One valve incorporates the bleed so additional piping and bleeds are not required.
  • Reduced Space
  • Reduced Weight – Results in less stress due to loading and vibration.
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Double Block & Bleed Valves

Double Block & Bleed Valves

Product standards & features

Applicable standard range

SIZE 1/2 NPS - 8 NPS
CLASS 150 - 2500

Applicable standards

Design ASME B16.34 and EEMUA 182 (if applicable), ISO 17292, API 608, API 6D
Inspection & testing API 598
Marking MSS SP-25
Fugitive emission ISO 15848

Applicable end finishes

Face to face Manufacturer Standard
Socket weld ASME B16.11
Screwed ends (NPT) ASME B1.20.1
Flanged ends ASME B16.5
Butt welding ends ASME B16.25

Product features

1 Floating or trunnion mounted ball valves in main bore, each valve is bi-directional and designed for full differential pressure at ambient and low temperature. For main bore valve general features see the ball valve sections (floating ball or trunnion ball).
2 Full die forged structure for all pressure containing parts.
3 Integral body comprising of two ball valves through main bore with a needle bleed valve from the cavity between the two ball valves. Housing design can be split body or end entry (end entry cannot be feasible for all range).
4 Standard primary gasket design is Lip-Seal type, secondary emergency seal always provided for fire-safe purpose.
5 High quality sealing products and reduced leakage points.
6 Improved safety in operations, space and weight.
7 Compact design.
8 Uninterrupted flow for negligible pressure drop.
9 Reduced stresses from loading and vibration.
10 Designed and engineered on a case-by-case basis.