Double Block and Bleed Valves
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Modular Double Block & Bleed (DBB) Valves

Colson X-Cel can supply a range of primary isolation double block and bleed valves (DBB) meeting the requirements of both instrument and piping engineer’s needs.

The valves offer significant savings in both weight and space as well as reducing installation time and cost. Suitable for isolation of lines, Sampling or chemical injection service the valves can be supplied using ball, Outside Screw and Yoke (OSY), bolted or threaded bonnet needle valves.

Connections can be manufactured that include flanged, threaded, hubbed, compression or welded and are available in single piece or bolted construction.

Materials: CS,SS, Monel, Hastalloy, Duplex and High Nickel alloys.
Seat: Metal or soft. Firesafe as standard.
Connections: 1/2” to 8” threaded, welded, flanged or Hubbed.
Bore sizes: 1/4” (6mm) to 8” (200mm)
Pressure (max): Ansi class 2500 - 6,000 psig (414 barg) and API 10K (10,000 psig(690 barg)
Temperature (max): 1000 °F (538 °C)
Design Standards: ASME / ANSI B16.34 / B16.5
Safety Factor: 4:1
NACE MR0175 / ISO 15156 available
Smooth Low Torque Operation

Take a look at our Double Block and Bleed Valve Reference Chart >

Products

DBB Series Barstock Block & Bleed Valves - Threaded
DBB Series Barstock Block & Bleed Valves - Threaded
  • DBB Series Double Block Bleed Valve
  • Ball/Needle/Ball Bar stock DBB
  • Size range 1/4 Inch to 1 Inch
  • Pressures range 6,000 to 10,000 psi
  • Material 316ss to Super Alloys
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DBN Series Barstock Block and Bleed Needle Valves - Threaded
DBN Series Barstock Block and Bleed Needle Valves - Threaded
  • Needle/Needle/Needle Bar stock DBB
  • Size range 1/4 Inch to 1 Inch
  • Pressures range 6,000 to 10,000 psi
  • Material 316ss to Super Alloys
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DFB Series Firesafe Integral DBB Valves - Ball Type
DFB Series Firesafe Integral DBB Valves - Ball Type
  • DFB Series Double Block Bleed Valve
  • Ball/Needle/Ball Flanged DBB
  • Size range 1/4 Inch to 3 Inch
  • Class rating 150 to 2500lb
  • Material 316ss to Super Alloys
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DFN Series Firesafe Integral DBB Valves - Needle Type
DFN Series Firesafe Integral DBB Valves - Needle Type
  • DFN Series Double Block Bleed Valve
  • Needle/Needle/Needle Flanged DBB
  • Size range 1/4 Inch to 3 Inch
  • Class range 150 to 2500lb
  • Material 316ss to Super Alloys
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