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Double Block and Bleed Valves

Double block and bleed valves provide dual isolation and a bleed function in a single unit, ensuring enhanced safety and reliability in critical piping systems.

Bestway offers high-quality double block and bleed ball valves, available in both soft and metal seated versions, proven through successful projects in oil and gas and petrochemical industries.

Double Block and Bleed Valves

Double block and bleed (DBB) valves integrate two isolation valves and a bleed valve into a compact assembly, enabling secure isolation of fluid flow and safe pressure verification via the bleed port. These valves, particularly in ball valve configurations, are designed for high-integrity applications where safety and minimal leakage are paramount. Available in soft-seated designs for general service and metal-seated for high-temperature or abrasive conditions, DBB valves ensure durability and performance in demanding environments.

Key Properties of Double Block and Bleed Valves

  • Dual Isolation: Provides two independent sealing points for enhanced safety.
  • Bleed Function: Enables pressure verification and safe maintenance.
  • Seating Options: Soft and metal seated designs for versatile applications.
  • Compact Design: Reduces space and weight compared to multiple valves.

Common Standards and Materials

Double block and bleed valves are manufactured to meet rigorous industry standards, ensuring reliability and compatibility in critical systems.

Type/Standard Material Application
Ball Valve DBB: API 6D, ASME B16.34 Carbon Steel (A105, WCB), Stainless Steel (CF8M) Oil and gas pipelines, refineries
High-Pressure DBB: API 6A Duplex (F51), Super Duplex (F55), Inconel 625 Offshore, subsea, high-pressure systems

Applications of Double Block and Bleed Valves

Double block and bleed valves are essential in industries requiring secure isolation and pressure verification:

  • Oil and Gas: Ensures safe isolation in pipelines, terminals, and offshore platforms.
  • Petrochemical: Facilitates maintenance in processing plants handling aggressive fluids.
  • Power Generation: Manages high-pressure steam and water in power plants.
  • Subsea Systems: Provides reliable isolation in underwater production systems.

Specifications

Ս Up to ANSI Class 1500 lbs; 2000–10,000 PSI (API 6A)
Properties Values & Limits
Material Carbon Steel (A105, WCB), Stainless Steel (CF8M), Duplex (F51), Super Duplex (F55), Inconel 625
Design Standards API 6D, API 6A, ASME B16.34
Connection RF, RTJ, Flanged, Welded
Size Range 1/2" to 24"
Pressure Rating
Face to Face API 6D, ASME B16.10
Testing Standards API 6D, API 6A, ISO 5208
Flange Details ASME B16.5, API 6A
Product Spec Level PSL 1, 2, 3, 3G, 4
Trims API Class AA to HH, Soft or Metal Seated

Considerations for Use

  • Seating Type: Select soft or metal seated based on fluid, temperature, and pressure conditions.
  • Material Compatibility: Match valve material to fluid and environment to prevent corrosion.
  • Maintenance Access: Ensure bleed port accessibility for safe pressure verification.
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