Monoflange DBB Valve Stainless Steel

This premium stainless steel monoflange double block and bleed (DBB) valve manifold is precision-engineered for critical isolation in natural gas and oil pipelines. Integrating dual isolation needles and a vent valve into a single compact forged body, it minimizes potential leak points while providing safe, space-saving, and high-pressure fluid control for instruments.

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The flanged block and bleed manifold (monoflange DBB) represents a highly reliable, compact alternative to traditional multi-valve piping systems. Expertly machined from a single piece of forged 316 stainless steel, it combines primary isolation, secondary isolation, and vent/bleed operations within one robust unit. This design drastically reduces installation weight, space requirements, and fugitive emission leak pathways, making it the industry standard for mounting pressure transmitters, gauges, and switches in upstream natural gas and severe process applications.

Technical Specifications

Valve Structure: Monoflange Double Block and Bleed (DBB) Manifold
Configuration: Block-Block-Bleed (Isolate, Isolate, Vent)
Body Material: 316/316L Forged Stainless Steel
Needle / Stem Material: Hardened 316 Stainless Steel
Inlet Connection: 3/4" Class 1500 RF Flange (or customized ASME B16.5 flange sizes)
Outlet Connection: 1/2" NPT Female
Vent / Bleed Connection: 1/4" NPT Female (equipped with plug or vent valve)
Pressure Rating: Class 1500 / 6000 psi (Up to 41.3 MPa / 413 bar)
Maximum Temperature: Up to 538°C (1000°F) with graphite packing
Stem Packing Material: PTFE for standard use / Flexible Graphite for high temperature
Handle Type: Ergonomic color-coded T-bar handles (Blue for Isolate, Red for Vent)
Sealing Design: High-integrity metal-to-metal bubble-tight seat closure
Bonnet Safety: Anti-blowout stem design to enhance operator safety
Flange Face Finish: Serrated spiral finish complying with ASME B16.5 standards
Applicable Media: Natural gas, crude oil, corrosive liquids, steam, and hydrocarbon gases
NACE Compliance: Conforms to NACE MR0175/ISO 15156 for sour gas service
Fugitive Emissions: Tested and certified to meet low-emission standards (ISO 15848)
Testing Standard: 100% factory hydrostatic and pneumatic shell and seat tested to API 598
Fire Safety: Fire-safe design engineered to minimize external leakage under thermal stress
Mounting Integration: Directly mounts to process pipe flanges, reducing bracing requirements
Traceability: Fully heat-code traceable body with material test certificates (EN 10204 3.1)