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DOUBLE BLOCK AND BLEED VALVES (DBBV)

DOUBLE BLOCK AND BLEED VALVES (DBBV)

DOUBLE BLOCK AND BLEED VALVES (DBBV)

DBBV is a single valve solution used as replacement of two in-line valves with a drain and/or bleed valve. The Double Block and Bleed valves are Non lubrication type of valves that allow flow in either direction. They are ideally suited for pump house applications where both sides of the discharge valves are expected to be pressurized with different fluid medium.


Double block and bleed valves are offered in cast construction. Valves are reduced bore design with flanged end (with raised face).

APPLICATIONS

  • Metering skids.
  • Tank farms
  • Airports
  • Pipelines
  • Manifolds
  • General Info
  • Design standards
  • Product features

General Info

DBBV has two seated surfaces (slips). When the valve is in closed position each individual seal is fully isolating, not allowing any leakage from downstream, upstream nor from the body cavity. A thermal relief vents / bleeds the body cavity when overpressure occurs so the downstream pipeline is fully isolated from upstream pressure without necessity for pressure balancing.

Compared to other types of DBB valves, Double Block and Bleed plug Valve has the DIB - Double Isolation and Bleed function and therefore it provides double security due to two seals that are independent on each other.

CHARACTERISTICS

  • Skills in operating conventional (Vertical Turret Lathe, Milling, Drilling, Boring and Vertical Grinding Machine) and CNC machines (VTL, Turnmill, VMC and Boring).
  • Expertise in fabrication, process control and fixture design.
  • ISO 9001:2015 certified processes to meet air gauge tolerances and accuracies.
  • Expertise in Reverse Engineering, Modelling and Prototyping.
  • Understanding drawings with international standards and understanding customer requirements seamlessly.
  • Dedicated facilities to load / unload components (Three overhead cranes of 5T lifting capacity, A Frame with electrical hoist of 2T capacity and on demand mobile cranes for heavy components) and dedicated overhead cranes for individual machines.
  • TIG, MIG and Arc welding setup (WCB, WCC, LCC, CF8, CF8M, Stellite 6/21, Inconel).
  • 60 Skilled and 20 semi-skilled employees.
  • Packaging and export.
Design API 6D, ASME B16.34
Face to Face dimensions API 6D, ASME B16.10, B16.47
Flanges ASME B16.5, B16.25
Fire Safe ISO 10497, API 6FA, BS 6755
Fugitive Emission ISO 15848, TÜV, Shell MESC SPE 77-312
Testing API 598, API6D, ISO 5208
Marking CE, MSS-SP-25
Topworks ISO 5210

Product features

  • Floating or trunnion mounted ball valves in main bore, each valve is bi-directional and designed for full differential pressure at ambient and low temperature. For main bore valve general features see the ball valve sections (floating ball or trunnion ball).
  • Full die forged structure for all pressure containing parts.
  • High quality sealing products and reduced leakage points.
  • Improved safety in operations, space and weight.
  • Compact design.
  • Uninterrupted flow for negligible pressure drop.
  • Reduced stresses from loading and vibration.
  • Reduced installation and maintenance requirements.
  • Designed and engineered on a case-by-case basis.