Double Block & Bleed valve

  • Reduced potential leak paths with primary & secondary isolation in one valve.
  • Compact ball/OS&Y/needle valve assembly in one DBB.
  • Flange construction as per the requirements of ASME B16.5
  • NPT threaded connection to ANSI/ASME B1.20.1
  • Pressure rations as per ASME B16.34 Class 150 thru 2500.
  • Wetted components of Sour gas service valve are selected as per the requirements of NACE MR0175/ISO 15156
  • Fire tested as per BS 6755 part 2/API607
  • Anti-Static Device is set between the stem and ball.

Dk-Lok DBB-venttiili Double Block & Bleed valve


  • ASME B16.5 flanged inlet connections ½” to 2” sizes
  • Standard ½” NPT female outlet
  • Bleed port ½”NTP female with Hex Plug is standard
  • OS&Y with graphite packing is standard, optional PTFE
  • Needle valve with PTFE packing is standard, optional Graphite.
  • Optional fire safe design to BS6755 part 2
  • Optional NACE certification.

Dk-Lok DBB-venttiili monoflange