DBB Double Block & Bleed Ball Valve

The DBB (Double Block and Bleed) Isolation Philosophy requires two in-line isolation valves and a bleed valve to safely isolate downstream pipes. This design allows for the safe draining or venting of trapped fluid between the two sealing elements. The feature can be incorporated into a single valve with a bleed port between the obturators.

Double Block and Bleed ball valves are widely used in industries such as offshore oil and gas production, gas and oil terminals, and LNG carriers, providing reliable isolation and enhanced safety in critical applications.

Size Range: 2”-24”

Pressure Class: ANSI 150-4500
API 2000-15000

MAIN FEATURES AND OPTIONS

• Construction: Split body with robust bolted joints

• Design Options: Available in both floating and trunnion-mounted configurations

• Material Selection: Extensive range for both body and internal components, including:

  • Carbon steel

  • Low alloy steels

  • Stainless steels

  • Duplex 22/25 Cr

  • Nickel alloys

  • Titanium

• Surface Enhancements:

  • Overlays: Alloy 625 / 316L

  • Coatings: Tungsten Carbide, Chromium Carbide, ENP

• Seat Options: Soft or metal seated

• Sealing Function: Single or double piston effect seats

• Safety Feature: Integrated double block and bleed functionality

• Internal Protection:

  • Overlay on sealing surfaces only

  • Cladding in seat pocket areas

  • Fully internally clad for enhanced corrosion resistance

• Special Applications: Available for high and low temperature (including cryogenic), erosive, abrasive, and corrosive service environments