Maintenance and handling of DBB Valves

Insights how to reduce maintenance and installation effort with
Double Block and Bleed Valves.

The ultimate facts about
Double Block and Bleed Valve Installation

Double Block and Bleed Valve systems are conventional installations for most end-users in the oil and gas industry. But the conventional installation of DBB Valves is a time consuming process that can negatively impact the daily maintenance and operating work.

Conventional Installation

The normal process of a conventional installation is based on:

  • Two 6″ 1,500 class ball valves are used
    Additionally, a lot of materials are required.
  • Up to 41 steps are required
    Long and complex installation process.
  • Very bulky products with weight of 2,645 lb(s) = 1200 kg
    Huge amount of material is required.

COMPACT DBB VALVE Installation

In comparison, a preferred method is to use a Compact Double Block & Bleed Valve Installation. Instead of using two valves in the earlier example, Compact DBB Valves only requires one single valve.

  • Reduced weight down to 2,094 lb(s)
    = 950 kg

    If the end-user has 10 different DBB Valve installations, using Compact DBB Valves would eliminate over 20,000 extra pounds of weight.
  • Minimized shut down time
    Maintenance and operating staff need less time for maintenance.
  • Process reliability 
    Highest safety due to Dual Ball DBB.

Specialists for
maintenance and operating

The complex work processes often combined with tight time windows represent a special challenge for installation and maintenance specialist working in the oil & gas field or other industries. Get insights how you can reduce your maintenance and installation effort by using Double Block and Bleed Valves. And at the same time providing a process safety solution for a positive isolation on both sides.

Compact Assembly
Reduced Weight
Reduced Leak Paths
Space Savings

Significant advantages for
maintenance specialists

  • Space and weight savings
    If you have 10 different DBB Valve installations, using Compact DBB Valves would eliminate over 20,000 extra pounds of weight.
  • Easy maintenance and handling
    Due to the reduced weight and space in case when you have to climb up the tower to change the DBB Valves.
  • Spare part service
    We offer you a reliable spare parts service for DBB Valves and an easy communication with a local hotline and physical support.
  • Occupational health and safety (OHSA)
    Safety requirements in the process industry are extremely high.


    When looking for a Double Block and Bleed Valve always consider that the DBB Valve should meet the requirements of OSHA to provide a safe solution for a positive isolation on both sides.

DBB Valves
Features and Specifications

Standards & Pressure
  • DBB full bore valves
    Meets the minimum bore requirements according to API 6D / ISO 14313, Table 1.
  • DBB reduced bore valves
    One size below nominal size of valve with bore according to API 6D / ISO 14313, Table 1.
  • Pressure
    Meets pressure class from 150 to 2,500.
  • Fire safety solution
    Fire safe in acc. to API 607 and ISO 10497
  • Compliant to NACE
    NACE MR0175 and ISO 15156
  • Factory test
    Factory tested in acc. with ASME B16.34, API 6D / ISO 14313, ISO 5208
  • Manufacturing
    In acc. with the pressure equipment directive (PED)
Design & Material
  • Design variations
    – Stem design ensures ensures the anti-blow-out function.
    – Anti-static design used to reduce the static charge generated on the ball due to friction.
  • Bi-directional
    Floating and trunnion ball valves are bi-directional by default.
  • Painting
    DBB valves are available with any kind of adequate coating for environmental protection.
  • Materials of construction
    Stainless Steel 316, Duplex and forged Carbon Steel A105/LF2.
  • Ball seat material
    PTFE, Devlon, PEEK or Metal Seated.
  • Stem seal material
    FKM or HNBR. RGD resistant (Rapid Gas Decompression) or Graphite.

DBB Valve Design
Design makes the difference

2 Piece Design 

DBB Valves – Maintenance and Operating
FLANGED STYLE FEATURES
  • Bore size 1″ through 2″
  • Floating ball design (bore size 1″ through 2″)
  • Trunnion ball design (bore size 2″ only)
  • Acc. to ASME B16.10 standard length
    – Floating ball design class 600, 900 & 1,500 I 1″ also Class 2,500
    – Trunnion ball design class 900, 1,500 & 2,500
  • Flanged connections acc. to ASME B16.5 or EN 1092-1
  • Lockable Handle/lever – removable, gear box operation available. Actuator mounting flanges, unless otherwise specified, are in full accordance with ISO 5211
  • Forged body
  • Vent connections:
    – Integral vent valve – needle type, screwed bonnet or flanged bonnet (OS&Y) – Screwed vent valve – ball valve

3 Piece Design 

DBB Valves – Maintenance and Operating
FLANGED STYLE FEATURES
  • Bore size 1″ through 6″
  • Floating ball design (bore size 1″ through 2″)
  • Trunnion ball design (bore size 1″ through 6″)
  • Length based on supplier standard
    – For short design „Studded Space Saving Design“ available
  • Flanged connections acc. to ASME B16.5 or EN 1092-1
  • Handle lockable and removable, gear box operation as Standard. Actuator mounting flanges, unless otherwise specified, are in full accordance with ISO 5211
  • Forged body
  • Vent connections:
    – Integral vent valve – needle type, screwed bonnet or flanged bonnet (OS&Y) – Screwed vent valve – ball valve
    – For 3“ to 6“ also flanged ball valve, flanged VariAS-Block and flanged monoflange available

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Insights how to reduce maintenance and installation effort: